Watershed and stream network delineation using QGIS: Tekeze-Angereb river basin Ethiopia.

okay welcome to this tutorial my name is Carson Soto an immature lecturer at University of Gondar interests of Technology this tutorial is prepared for physiological water resource engineering students on the coast has a remote sensing which specifically for the top extreme cosmic elimination before proceeding to the main section it's important to acknowledge reference that we are going to use in this all Toria we are going to use a book I transfer request and port monkey that is with the title King G is for hydrological publications recipes for catchments had forgotten about our management doctrine has spanned across things to make sure that IG dealt then first thing that's before proceeding to the stream and catchments detonation is if being the catchment or a watershed mean physically this catchment or watershed is confusing because of the usage of the terms in British accent that's the acceptor lumen over the world with possible accents we will be using agree will be brilliant facing we will difficult or watershed as a drainage basin it is an extent of an area of land we were the surface water from then melting snow or ice converges to single point the more innovation usually takes occasion when Tim artists will join another words the body that means a river or a lake deserve an S tronic wetland C promotion so the the placing or the generic procedure that we are going to follow when we are going to do this clinicians and for big first we have to promote the advance of the study area then if at this point we have to be sure that a study area must be covered or the class material we want to drive should be correct completely then if if if the study area is covered with multiple themes else should be liked and the task should should should create seniors for them there the dentals or them that we downloaded from the author source these data source websites may have the difference projection or coordinate system so you have to be projected to the coordinate system of the project and then the indicates when the merger tiles or the mosaic happens larger than expected or the provost's 30 million we have two subsets and one we have to clip it because this one are setting the table then the next step will be the interpolation points if when the pixels when we snow that exists in that then we need we need to do the interpolation then the next thing will be filling the scenes making this hydrologically correct them in other words if we have a stream flow rate stream flow data that is at is for baby no we can also turn into a stream network if it is available on the Steve I'm not going to see this inter punishment no interest then the next thing will be calculating the flow direction where all flows are flow from higher elevation to lower elevation they will burn up the streams then it filters speak up to the point of the ultimate of village-based they will then we will convert the velocity to remodel format because it can be used for hydrological modeling or hydraulic modeling so how to prepare the Etta's in the way that the model needs then I will process to the downloading of the Empire's we have to navigate to absolute a little bit under this first Explorer USGS dot GOP found assertive Devils which is painted by 90 meter or certainty by ultimate resolutions this is an open source of value and resource portal for you us your leaders technology out survey and you can load the promotion's to download this temp as you could use the brigade's even knows all our quadrants like three portraits which is where the study area is located study area is located in mike is around each of you knows west and total on the streams head of the leg thumb which is the area which most rivers are pruned like with each paper like the the peel your angular river the shin Arriba permission switch which will follow the ministry one and the other see the marina angrily but the bigger angrily but which is extremely tray of Turkish a river which is which is also the main tributary of river so we are going to patch my last coordinate here my last last coordinates will be 12 then now I already added the coordinates the last for net and hopefully it was create a vector even then he'll choose datasets on this option they now say I will choose here the digital elevation you should [Music] to the digital innovation then s our team will result in the lectures the i-70/us romantic asset still take the results and as you can see here the total project maka see how this tiles covered the total project area meeting the food's the footprint official the footprint here the footprint of 1f to print of a servant the content of the serve time and the red of the form style as you can see this all four tires are combined and if project areas location it is an elevation model project area locations so the weight when it was acting on this case to cover this or he then I will click Submit screaming request then I will automatically put everything from here I can say download here it can give me a comment and I can't say it out loud the chapati formulas and also download this one the relative format and we do not all four of them will get to my QGIS I've already finished set on boarding process so the next thing that we will be I think the templates in the teachers environment I have starts TGS here QGIS I am going to use cube justice for G 3.8 or the polygynous for pool diba then I'm going to do my going to watch this the parts are both made a source quality they know select truster it hasit as you remember this beautiful ice our image instead elevation waters we will talk about it in the digital elevation models before working on installation noodles it is also important to talk about this digital individuals or select where I put is East elevation others also Vegas all of them all the four of them and then a bit and I think Lucy this is empty as our table here is a portent as enhancing downloaded with elevation values ranging from 400 up to 3 3,500 the elevation violation with this deregulation waters we have to see what a digital elevation model made by law basically this digital innovation models are digital terrain models which are positive models of part of all the surface images upon this this philosophy although statistics also as water then when DTM includes called the natural and human-made futures when it is everything is in group and call this is in solid surface morning then how come we have this digitally division orders most of the degree what is from this one develop this elevation model from ground starving includes a digital GPS or differential GPS measurements or you can use a stereophotogrammetry or evalso digitized Ottomans and create digital elevation model then what will be the use of this linear series of these themes will be determined in Catalan Vidya delineating the drainage network you can do straightest innovations this asphalt identified knowledge of structures will also create or generate contour maps from this years so the next step that we are going to be from our our procedure that I introduced in the beginning the next to be if there are number if there are n times number of adults we have read one last nanosecond this this as then we have to give it using using 2d to ask them mr. less the build virtual cluster then how to select all the elements here in the house ok then how to untick place each in good adding to intersect right and because I'm not doing I'm assessing analysis so I'm going to uncheck this one so I'm going to run it okay the virtue of the virtual name is created and all the fourth times our merger to be one first one day on what one virtual roster there the basic thing that you are going to do will be before doing any analysis will be saving your project this an important thing to save it here this is Italian modified and I would say it here you can call it just like this I'll save my project just like this except and also when I mean every analysis I have to have to save it because I'm going to be project this one I will I will keep the word out there just a disease that's in doing the whole process and say everything because I don't want to lose click the next step today would be rejecting this first Ronda into Twitter DM projection system Filipino projection system is conventionally in purchasing government we use wgs84 UTM 37 north so navigate to especially France dot org I don't search for this new GS eighty four zones 37 north to to find out GSG what I mean click the search button and it will show me the following following EP epsg courts and the one that is perfectly matching is the last one this one epsg 32 630 Sun and take that number and go to my QGIS environment and change the projection to the projection how to navigate through rust then miscellaneous I mean projections then products or new projects in all the input layer and choose this virtual virtual on the target coordinate system or coordinate reference system I will try to search commander 132 637 32 and it'll show me exactly this one if you navigate and check it again check it again if I enlarge this box over here the clearly can be shown that the top Air Force have this with this UTM zone and the other thing would be setting Travis limited to use and I choose a default one the nearest neighbor then the node at open forums and then the output output resolution I would need to certify then I will save it set of five same a of navigate to stepped on the other against I will call it we'll see sale date okay now we finished the reproduction process now we don't actually need the first reveal normal because we are going to work with a new one that is already projected I'll remove this agent then the next thing will be changing the ultra light projection the projection on the project it is currently on opening a projection so I will change it to the transactional systems project area on the table I click on a PSD as you can see from the corner the coordinate reference system is the PSG 4326 so I'll change this world of each other and that will show me like this and I would sketch now also 32 6 37-32 657 and I chose this one can clearly see that it of the holes in this UTA location Universal transverse Mercator location then I will say and I'll say ok as you can see now the epsg code of this project is changing 2:30 to 6:30 7:00 now there is no ultimate rejection and it's not a good time to steal my permit I'll save it okay after serving the project following our generic procedure for permanent in the catchment next one will be upsetting that subsetting air means minimizing extents that means I will have undefined one day I'm from Google Earth environment and we'll minimize a love extent of system so it will not take longer time for analysis and I would have a specific for specific project area so I put expressmax to create my boundaries on the google mark the prima who prefers before before bringing any only given to the purpose so that i'm have accurate accurate so i will i will part here that our tools here how's the ad then I'll say Oregon then when this dialog I'll say explained then I come here and the troll Oregon as you perceive controls simply just like this I already made many points other committed again it's better to commit again I don't select all you can use this and are say yeah extinct extend and I will come here I would have one point here the other point here the other point here and the other point here then hahaha extent of area already and I'll say ok then I will set this one layer of extensions have displaced us and I have to form a scam Z format in KML format able to use this KML format and anomaly to my folder where my all my professor found and as a of extinct email and I'll save it here then I'll come back to my acting jealous environment and I'll add vector layer or navigate to my folder this one needs of a modified they now at this era of extent pyramid and it and I propose it as you can see it's not it's not visible as you can see material extent is already added on the only on the plane the team every projected the then I will change this one to a ship and so that I can extract this one a mask and subset click Edit export and save you trust then I would say a sweet finely tuned to the photo where I saved everything everything in instance one hand to be working on then outside bench this is a boundary then I'll save it and the coordinate reference system should be 32 637 because it should be similar with the mr. layers because typing it in on flight projections anymore then you'll say ok then as you can see the point is already here so you need this area of extended I am I will remove it then I'll save my project in the next int will be the next thing would be extracting my mask of this de-stemmed smaller smaller and smaller size scale so that marina my analysis fnatic have knots then the next thing that I am going to do be clipping the raster by mask there I'll go to Rasta then how you go to extraction then I will say keep us right then I will choose the input layer is reprojected 1 then I'll choose this round one and then coordinate the target coordinate system you can also set it here this will be 32 6 this artisan I'll choose this one and I'll say ok and assigning the specifics the specific node to the output means not it'll be the default then I will check the magic stink of click trust them to extent of the mast manner that have been checked and X resolution to be output months and see whether adulthood pants it's also option and vivid like the difference money then I'll skip this one and I'll quit the M sub set this one subsidence and then it and plug this one in project Andre density projected I will only have clicked the different the subsidy already that is minimized to the interest area where my specific project is okay guys after flipping in a mask we already the setting process let's check whether we are following procedures or modes we will navigate to our methods of teaching materials here I want to get to this one and six and see better man following the generic way of Delaney in each catchment let me check it then this one is substantive process we'll already here we already know the name else we already know selected I'll be project to the coordinate with persistent project which you know is Northwest Manitoba with epsg code of 32 667 on in naming of the UTM or the unit whispers woman it has a coordinate project projection it is UTM 37 north and we already had we are already at this point and we already clicked mostly virtual them into specific projects area location then if there is a void in our them due to the processing or during unloading that it has it we have to interpolate and fill the voids in our case we we already found this 30 X 30 meter resolution and I don't think we need this kind of process integration avoids but out the definition works at excels is not beta in your planner result of position procedure most of the pending discuss about the acquisition procedure of details it's coming from the differential GPS or any other satellites or drones on aerial photogrammetry then words can interpolated using the plans of the surroundings as we will use the surrounding cells values to interpolate we have no data values or filter works then the next procedure is filling the things or removing price fling filling the the scenes is important procedure that we need when we are relating at them it's a result that additional bits in landscape it is set of one or more cells which has no nerve cells around it and kids are removed using Helsing's Russia in July software this is we are using ugss publication then if the landscape contents real since example for example reasons committee lakes or reservoirs or another depressions this this needs to be added after moving this up it's a very moving piece then this pits of sins can be removed by or cutting school or vinegar we can we can fill up to the elevation higher than that the sink or we can cut the higher elevation and produce produce a single using cutting so we can we can use this these two procedures or another another procedure can be burning the stream networks if you have a stream network or a river network abital for your project area you can just burn it to the actual and create the exact teaming arrangement for the proper flow direction that means the algorithm will follow the river network algorithm of the general procedure a little more explanation will cross this burning industry now the next thing would be how we are going to do this fishing or removing of the spec we already have this technical sausage and then the easiest the easiest way to do will be using the saga algorithm the first things don't type in here that few things here Phil Phil things there are the various food sinks algorithms here from the grass for payment from the saga provider as you see we are going to use the one under the cigar provided Tyrion under the analysis I do notice there are three Phil sings such things and feel things are still random view and the other one feels same success as also developed by one can do for the sake of physics to use the alcoholism that is better in performance which is blessings by developed this one and you understand then we will select the dev subset here the minimum swabs I will leave it to the default and the field then observed Saratoga and it will be I will collect them film and the other thing would be if you then the other thing would be I don't need to have this flow direction to calculate beforehand actually the worship business at this moment I will complete it order the stress or after during the streams in their orders we conduct order to be the next the next but for now I will only do filling process I will simply run the algorithm and see the process will take a while to run this fill sink so in heart waits in patient patiently now as you see the algorithm for things has finished processing so we are going to style the filter I'm going to select the fuel game the film them there and click on this sliding compass alternatively xl2 to do the scaling now I am going to select here the single man degree in the column and learning I will select the single bond hello and as you can see when I'm selecting anything on my layers training it is updating layer automatically as you can see because I already checked the live update here the box here if you uncheck Salalah after every change you make without care after you click the apply button so this I do not prefer to s apply every time so I did I did check this mother update then I already choose this single part sugar color then I'm going to abroad click on this color button then I will say create a new color and and I will select the pattern of CPT city then I'll say ok then when I say ok the city CPT City of London display a large based on different parameters are different colors if you see you can on the Blues the Greens the Queen's the QGIS programs when you have a precipitation data and I have a template and when you have a topography when you have Domingo support from a team entry then you can also have the transparency option shoot in my kids saw it in my case I'm going to select the topography then I'm going to select the diversion because it is a digital innovation model then I would select just like this and this will give us more intuitive course in the game where we can clearly distinguish the higher and Zalora gasps now we're going to improve the visualization person the next thing to be will be by clicking on the ethnic in Gandhi I will tell pic apply and I will right click on the fill them and say duplicate this layer duplicate layer and as you can see there is a name for him the next thing will be unchecking Delphia or the fill dam and renaming the film then copy into the hill I'll do that renaming the layer our colleagues here ok then check this one I will go check which layers then then I got the I will go to the layer styling option or the hinge head and and I'll change the color rendering to Hill shaped format as you can see you can clearly see that the really topography of the area is visible not if you pinch the direction wheel here this is the altitude or the M&D as what the aluminum vibration you can you can clearly see the actual innovation of the hills in the area and also the deep pressures clearly as you can see when I'm rotating the wheel of the the azimuthal direction if it is changing with respect to the location of the other day for example I'll leave it here on the northwestern yeah because my project area is not there then just this this one is to visualize the ups and downs or the higher elevations and the crystals and scores of the area you can determine also I can possibly guess where the location of stream flows or the direction of the stream the stream flow before calculating the flow direction so the next thing will be I will check in the filled them and I will increase the transparency I will go to the layer styling and the next thing to do will be the entering the blending mode should be multiplied when I say multiply as you can see the visibility of the higher and the lower elevations were more visible or transparency of T one day or the diffused M is better so we did improve the visualization of our so the next step will be according to our general procedure filling the sinks or removing the specs and making it better in in terms of visualization the next steeple step would be calculating the flow direction but what we mean by the flow Direction mod the flow Direction shows selection map shows the direction of the rivers and the river network button from the to returns for certain entities ultimate point then we can use different types of algorithms to calculate these flow directions the first type of algorithm is the theater voice and second one is the d m from the D infinity Larry algorithm the de Tocqueville's amuses heads biscuit directions to cut massive long erection this direction this discrete directions are they all 45 90 135 180 285 under 70 + 7 15 degrees to the steepest set us on words while the D infinity algorithm use the continuous directions in our case we are going to use vehicles which which uses its his kids positions or degrees because I I jumped the Berlin stream network step in here because when we don't have this big little of a specific project area so we will jump into this calculating this edge next to us it will be at that's before before before doing or before calculating the flow direction and map we have to order the streams that means we have to put threshold but which which streams will appear on our wood what a shipment we have to add that we have to decide a threshold which one would be the tributaries and which one would be the mainstream will be decided by calculating the star orders then the the higher the water will be the bigger the stream if it has a higher order that means that the river would be bigger for example if I have stream orders from 3 to 1 that means 1 will be the smallest the smallest order the last tributary and a second will be a media one in the star will be the the Sun will have a tribute Isis which has order of and a stream with order of struggle order form in half the tributaries with 3 is it the way to order the streams in a way that shows us that flow accumulation it will lead us to the flocculation and the cognitive of the drainage bases so we will try to order our streams and define our patrol for this specific project now we are going to use the sclera order ordering of the streams so that I type in here in the search box here and from the sect the saga provider Alkatiri analysis and channels house Alexis wants order then I will select the filter it's predicted then I'll save the finance to Z now sage and outs a safe been right I wanted to see how my baby will be generated that will also take somehow sometimes we have to wait for us patiently and after finishing after the algorithm has finished we are going to produce not with them in the water the lab from the boolean discrete or continuous faster but in this case where the struggle hundred dollars we are paying to generates will be so we are going to we are going to stain it based on the need for studying for this mistreats masters for that we are going to use on the clerk been drink plated single values as you can see this is a single pound plate so I'm going to use Hettich this unicron's then I can click on the pencil type button then as you can see classification is all ready for the next thing will be which unit body we are going to sign the last a unit and internal so I am going to let click on the random colors and I will select blues here because this will not give us now the star there if you visualize it from the map under canvas as you can see you can clearly see that the streams with higher order order has blue color with somehow higher magnification so we can see the rivers are here with s order and the smallest order the rivers with the smallest order will be Phoebe Terese and with highest order will be high stone so the next one will be 200 thus rather threshold to determine streams as you can see from the map the visualization we can clearly see that there is a stream network around here because dots the blue dots hi if Suman and come to the idiom I can clearly see the streams and tributaries on a better magnification resolution so the next thing to do will be to the VP calibrating the statistician to determine the streams with the highest orders and the smaller orders so we are going to create a boolean there from this description as we discussed in the class we have mentioned that the discrete ones are the Bears was a finite number of values and the boolean layer can have only two months whether true or false or zero so we are going to create a boolean math hence calibrates the Stalin threshold to determine the shrimps we are going to do that we are going to use last appropriate now let's do that now we are going to create a boolean there for our order larger than or equal to a certain threshold value so each boolean there will be conquered with reference there here we will compare the Strada order with the reversal OpenStreetMap for the areas where there is love eternal constrict street map you can use google satellite both OpenStreetMap and google satellite doors can be found on that click map service plugin so I am going to navigate to web then quick map service then I am going to promise him Open Street Map lessons then I'm going to choose open State Street not sooner then I don't see whether is as you can see my dare is on the open street map as you can see there are a lot of streams project area for example inside the boundary there it connects a simple fill to be checked under layer as you can see certain streams over here as you can see this one is I think this one is I think the video River which is a tributary of Z which is also a tribute of the river so there are also certain streams here so we are going to to the streams in the area in we have to compare it with the holes in the other Street not and in my case I have decided that I am going to be lose a threshold of 8 that means I am going to consider streams water that has more than 8 so the lots are going to consider each and he'll miss fields on this area along the Pacific Islands in this specific project then I am going to navigate to a star it will show me the and so the last emitters which associate reproject the pig mask and the strata I will take the strap and I will use the expression here pick this one this one will be with display on the raster operator expression yellow post then I will make 2 8 then I have to I have to say also the the particles air here folder where I am working currently this one is a each other modified and Martin to be Georgia then I can say it will show me what I wanna what kind of threshold that I went to use then after running this link I would learn I will and only I will put it here I would I will put put everything to effort the extent X minimum and maximum and the altitude coordinate system is set up to the projects completely consistent then I will run it and create boolean map when it's calculating that you can see the master has finished and you can see actually the stronger its develop here then I'm going to do their styling also to to make to make it's a good practice also to start this this virgin then I will select this one and I'll click on the layer styling make sure that on this collection box this color it is selected then I will choose this plated unique values then I can say classified as you can see because it is a boolean master because only two buns 0 on m1 in Nicky's I will have no stress Allen and streams volume then this layer is a limb and therefore it only had fix us with value 0 and 1 what our calibration it is important to make zeros transparent and once though so we can compare in the last term is streams on the loose treatment so that I am going to make the streams blue color and I'm going to make the ones with no skills with a white clapboard cos alpha then I will I will choose before doing anything I will change it I'll change the curve one two back blue because it will resemble stream so I'm going to select up blue here are blue will be select from the single layers a single nice here this one is a and when I go back because we consider it one I will change the labels here I will save this one no strips will be 3 Lobos are about the color of most three value because we are going to make it and spanned then then the next one will be making making on the color one make to making that arrows transparent then I will go to the transparency this one is a transparency and I will - 0 as additional it and as I mentioned already ditch the latter it's all need to be apply every time so it's already added then recheck it with a rapid zero or not then the next the next thing will be the next thing we'll be checking these streams with with much fun open open map bloody OpenStreetMap then see we are doing a good work or not and if i zoom in and check in as you can see most of the strings for example if you see this world the element is almost the same with the OpenStreetMap as you can see that the one from the order that I generated is following the actual River Network so we are doing a good job here then the next thing will be calculating the digital network flow direction and basis so we are going to use a cigar algorithm here I will type channels and I will select or select channel network and basis the basic algorithm to develop this channel NATO and benefit since on this specific project area so I will click here and okay we select our network internal business we have select on the nation and the threshold for asked the orders should be ain't that was a flaw collection we have to submit us Proclamation twist or not you have to run on kids as for this and step to fight and we've had to you have to save it as this direction then similarly alongside I've also said the other the other oh she's here to generate these channels and also to generate this Bennett presence this this process where is going to take somehow another time so I'm going to meet and explain that they will be three layers that would be generated between channels and business which is also vector type and we are going to have also for validation which so we are going to expect put three generated yes only after the algorism finished we are going to start each level and proceed to the last step that means specific and the operating so I will able to take him and wait for the algorithm to finish okay now the algorithm has finished as we have expected a you can see here there are three additional generational generation the train is busy and achievements so we are going to start this is less we have to zoom to there is generated for now I am going to select a channel one then I am going to select us then I would I would select here on the single symbol and select him graduated one then I will since parameters how's it the condiment to order then I will select the mated to size then it will be in millimeter and the precision to zero position should be zero and the size should start from you know constrain up to one point zero and the unit will be millimeters then the mode of classification keeping the default mode of classification as equal interval with the same number of styles da estrela order Warners order classes that exist in your clothes then we can really get repeatable if if we need to be in this example we are going to set the classes to swing having to set it to stream and we can click classify and as you see already it's already classified then we are going to click on the Change button and we are going to change the color to a DV of our value off fifteen RGB means the red green and blue values those dominant ones who can change the overall visualization of the club then 1566 and the blue one should be twenty then I will come back here I will go black and as you can see you can see it looks like a stream now the ones with smaller ones with a medium still are water in the ones with the highest order here I do know the next if I want to change these values to integer a consultancy service you can switch into it this one one two two and values can change it the stuff you do not know where should be your map will have a better visualization and showing the streams identify us higher level or the mid chance that means this one's the ones with the higher ones and the smaller quarters will be the streams and tributaries the other two and I will say okay if I want to edit the legendary spirit reteach the legend volume legend value edited this one with this one it's better to be just like this for a better visualization - they call it see know this place better now we are going to strike also that I am going to send it up and we are going to stand for action player and see the change but before going to start the flow direction there it's better to see how we are doing in terms of stress as you can see these ones are the streams with the and with with solar all the orders if Englishmen then I can also have the help them see things clearly as you can see these are streams in the drainage basins you can also see now we are going to style the flow direction here we have the flow direction here I'll select it and select the sky using this layer styling palette setting the layer to flow direction we have to check in the flow direction layers selected then I'm going to select rendering to create unique values then after selecting units click selecting this plated unique values I will select classify and I will have as you can everybody's we used Sylvain we used eight directions zero one two three four five six seven eight 255 255 is resembling color is present in flat areas so we don't need the flagellation we have to remove it from classification we will take new celexa 255 and select the minus one and on the color month the color and then we have to select here the spectra one as spectra dollar Rand as a beginning point and selecting the color non-peer any window will pop up window just like this then we will this represents here you can it's the other scopes form around by the eggs at the far left and right sides will be present the northern flows bench and he will say to both of these those stops to the same blue color he then sets the center stops - am i - no 4000 plus a scope in the middle on the rights with the western clothes and a scope in the middle to the left will be based on close now decide from directions this the first one represents a northern direction the last one also represents a northern direction this one is the East based on flow and this one the saucer oh and this one weighs control now I will take the proper men or this one and I'll select the and the my mouse pointer will change to an option repeat this then I'll select two and click on on the center stop that pillar represents a thousand rows as I admit this one in the north or one this one based on one and I'll select the thousand one and we will assign it to a bright yellow the interent RGB values 255 255 conceal in RGB values will be make a window a little bit larger I will be 255 and G will be 255 and I will make this one Z and for Easter stop for instance of this one in systems Allison existence up here I will make the RGB volume 0 255 and 0 I will be wrong she will be 55 and this will be 0 then for the Western stop we will use a magnetic color for the westerns augment this one monitor color will have the ability of this one is a Western one is already selected this one is horribly 240 and G will be 16 and they will be 170 then I will I will select ok to accept that then I will I will click on the plus button to add a new classification scheme I will select plus they will be additional its body then there will be a new body to classification for the body type 55 here are the type 255 this represents of material see initially not before creating the cyclic element and I will select the color clutch and select white on that and I will go back to the color selection as you can see this one is AIDS or the Funes area is represented with white then to review this flow Direction data you will not give it a blending mode of multiply now we are going to eat this one multiply and the other one will be we can turn on the heat shed the kitchen as you can see everything is finished now we can go out as you can see the flow directions now better there has a better visualization rather than using the field then I will turn on the u-shaped energy language make it below the flow purge then as you can see you can see the flow direction will be here the gorgeous can be visualized here clearly and and as a point just we should we should have now the tannins and he sheds layers and all the channels is here the heat racist is here I will turn off that still r8 and the OpenStreetMap stand at one with the Thermidor also now I only have the channels the hidden direction as you can see you can clearly see the direction of flow see they can see the mountains and the gorge areas cleared there you can zoom into some of the more mountainous Tyrion the sons of the study area with their arms four channels present you can inspect the data value where the flow is the flow is locating the you can see there are heels and also there are colleges how the channels are going or following the direction flow that's representing the flow direction then we can see that now that the thousand songs are areas for example this areas facing the slopes being represented by course by mr. most will be greener that the Western pros will be more purple if I put the channels above every dare he I can see clearly the direction of flows where it is following the world here now the next the next step would be defending the outlet point in this condition we are going to need the again addressing specifically so that we will see the specific specific specific streams are glaring for example if backwards next to the channels I can see that the drainage basins are already the market so that's the are following a specific product for example deposit this visit here it has tributaries and a history and you can also log its outlet points at the end of each specific place so we are going to use that now we are going to define an outlet office planning area as you see the Bennets basin is already specified we said that it is mixed into one area of land near the surface waters letting us know this converge to st. elevation this single point should be mounted in Spanish basic the one which I am current pointer the outlet area should be around here as you can see across the river here so we have to select a not a tail this point so we are going to put on the vector by now we we should have the parrot business turned on the channel Sarasota student map as you can see the OpenStreetMap will be used to to identify the exact exact the exact stream point on this condition we are selected we are going to select not my point is on the stream network you have to make sure that you clicked point this exactly on the street the street from the open standard map as you can see we have been eating attachments that is many the main river is called comparables this one is trivial as a diva which better complaints so we are going to turn on the coordinates culture for example I can picked up they go secret Russia and let me say start a change and then I will zoom in and select specific that is a string here knots another point on the map so it's better to select the state so my point is on the strength and as you can see copy to clipboard and this is Simone if you want to say the balance point of the ultimate point but you have selected I am opening the world document then I can say best as you can see it has so I can conclude patient hat I'm going to on the next step so I already specific the alternate point on this on this project then the next thing will be delineating the catchment that means specifically extracting judgments at is I am interest of the projects is located now the next step will be delineate in the catchment we are going to calculate the obstacle area that means circuit that produces a discharge at this specific at that point so we are going to use the slope ISM the up stop algorithm which means the Tyrian analysis hydrology I will select click on the absolute area under a target area this optional we have to debit as a default or get ex corde blades I have to copy from here here a copy the target x coordinate will be I will pissed here and the target y coordinate will be this one I'll copy and paste it here and the integration have select filter area and the same route sauce optional you can leave it as single and the method of the meat will be deterministic paint the convergence and maybe to have a little bit to one way to the default file then you lost em here and I will call it because I'm specifying the actual video okay then I will I will click they will wait until tourism finished committing to take some longer now we have finished calculating the post rebellion or the attachment to next in be polymerizing result so first it's visualize a result that means I have to put it was a crossing there is not here is a master which is our slope area here which has something watershed which is elastic body then how to analyze it we can select my keys I will select this video and it's not they don't save it then I will run the algorithm then the algorithm has finished they think Jose closed and we only have this one so I'm stick this one in as you can see I have the big guys put as you can see the actual area is already they need that that is also enough so to check the attributes I have to open it up to open the attribute table and check whether which which parts have to be removed from this is absolute for example when I wasn't making this one this one I have to see that the team's editing won't open it and see the each one immediately think for example this one represents here for example this morning presents inside Lydia in my case I only need this fourth one so how to delete the other values for example this one need to be deleted I have to click late in this procedure or General Hospital area is left here if you want it and also to net this values it's otherwise you can also keep it we will see better it's going to create a change on the actual attachment or not and edit the class it says no change I also like this one now the only thing left is that one is a hundred volume so I will save my results save my results and it was a pivot table for each exit or editing and I have to uncheck the drainage business as you can see the Bennett listen or angle attachment is already in factored form or it is very needed if I put on the channels on the top as you can see the general is of so the next thing to do will be tipping so clipping the area or the the area that is producing the spectrum they are going to pick the strings on this channels so that we are we will have on these streams in CFD so we are going to do this clipping process we have to also click the image with this extent and save them so we are going to do that you know how to do this processes this point we are going to have indeed four bears but this first one you have flute them chickens and we see so I'm going to mean with the other bears have to press shift and select everything and I will remove it I will say ok and I will say lift to remove it - remove it dose it and the next thing will be clipped inch using vexed in the area you know how to clip vector your processing tools and leap then it is already on the expected thing there should be ridiculous and the other should be in the third angle attachment and the new one will be saving too be stirs a they'll say they live right many tourism is finished taping the between the steps inside the angle attachment now I also don't need a children's so I remove this one this one is better say it now we have to extract also that the filter day with extent of attachment so we are going to use Rasta xenyx - you have to say click + tab a risk like we did for for Dallas Austin Ames and inputs there should be in the most there should be this exponent it does say that it would be everything will be a different value I will omit foods no data data value to output once a week that is we have to be here the only difference is that we have to give it a value that is out of range of elevations we can use - then we have to say image mask should escape to Witch has I'll have it I'm going to suspect a present sir individual team here so we're going to planet it's saying that there is a warning there is a links and intercession or near point this on the vector format so is this kind of yours happen so we are going to fix this error before proceeding to that you have to fix the geometry of this this is to check here fix geometries and pinky extra memories to already have this one I will select save to fight then I'll say judgment fixed so this one is anger attachment fixed in the segment now we already have a fix of geometry here now I don't need this vector instead they will remove it they never say self then I will come to the extraction process did by my scanner the input will be filled them they know set everything to default and they all say since no data I had to - lately they'd have to say safe to fight then our College wrapped innovation okay then or save it then our saver now I already have it so that save this one in there to meet the field game anymore yes I'll say okay now I have them come on so I have to make sure that this this this will be typed in the proper format and select single time super color and I will select here it's not I'll select catalog citi piti piti City and I will select here the topography then the innovation they'll say okay then they come to the blending mode this this this body this then the next thing to do will be studying the resulting Tasman II then by setting the Gertrude this is a geometry and select painting we're going to have him changing single symbol render to inverted convenience then the next the next will be this render this scene the inverted Bolivian women this renders the data as an anonymous from its toe meeting that means the other part from the US at the geometry will be didn't then this creates a mask around the catchment as well to create and we will select the simple component then change the single the simple data pipe here to shut past few there is shut Brazil as you can see then in the gradient of colors in the gradient of 60 the default will be two colors then we will change the first there to have achieved values values of RGB values of 100 certified for each she will also and then the next the next thing would be they will go back to here then in the shading style the sharing stand signals section have been to click the set distance option we are going to make the distance to four then the other - the other thing will be another that they are rendering we have a new rendering here we have to expand it there is a day render engine there is opacity opacity should be 65% 65% this will make the OpenStack much visible as you see from the Q GLS compass and finally at the top of the they're sitting panel we are going to go back to the talk of the decision problem we will select the shaft rest field component then we had another one here then we'll change this new symbol field vendor to symbol to single map we are going to change it to from a simple view field vendor from the from a simple now we are going to change the symbol there tight so to outlines in 1909 this one then the color should be the default black and stroke width should be higher than zero points should be 0.46 this will give us negative Organization for the for the underwater I will say apply in there was not motivated just like this we will debate a visualization you can say who's over there and it will see the casual drainage which is like this person a channels over here consider the wishes here the inhibitions the maximum we can make it continues if you want stats for 700 to Street alternate skin right now we did his holiness the second I would also make another video for and I'm not making it study this is heart catchments delineation then there are under the condition such if the concept we were to make this cuts mental strength delineation this generic workflow only works only works on surface let us say episode innovation areas the mountains and the course it doesn't work when it is at might influence media's or human controlled environments we should consider is is boundary conditions before doing this customer or stream flow relations then after doing this catchment area nations use it as an input or for hydrologic link additionally you can use it for agricultural management or infrastructure and there may be various application of stream or customers patination okay let's see what this and I thank you for issue I hope this video and make absolute definition for any stream is on the running of project and thank you for watching

Channel: Aflagat GIS and IT Tools

Views: 2,022

Rating: 4.875 out of 5

Keywords:

Id: aPfM62B0Nco

Length: 102min 7sec (6127 seconds)

Published: Wed Feb 19 2020