Finding Catchment Area using GIS

I'm just enjoying my vacations after I have just completed my assignment of finding the catchment area of a location using ArcGIS but how did I find it let's see [Music] hello everyone so today in this video we are going to see how we can find the catchment area for certain location using the software ArcGIS or you can say art map so first of all we'll open the file and we'll click new and we'll just click OK and also you can specify your location wherever you want to save your files ok so we're gonna click OK so now our new blank page for creating the or for for finding the catchment area is open so now we are going to enter our data or our location for which we are trying to find the catchment area because we need to find the catchment area for certain location so we need to enter the location in this GIS so a location you might already know that the location can be added in two Gs in the form of coordinates so I have my coordinates for which I am trying to find the catchment area that there are these this is an already built dam and I'm trying to find the catchment here for this you can also pick coordinates for any point for which you are trying to find the catchment you can just randomly put any location or any region you can find the catchment area for that so or you can just copy my coordinates and fire and just do it just like I am doing it okay so let's start the procedure so I have this coordinates so first of all how are we going to enter this coordinates into Q GI into ArcGIS in order to enter this coordinates in arc GIS we need a digital elevation model in order to obtain the digital elevation model you need to go to the website earth Explorer dot USGS dot t OE I will add the link in description so you can find that we have an option of AD coding it here in the search criteria you can find ad code you just add your corners here and you can just change the north-south and east-west accordingly in this ad gun I have already added my coding it's here you can see and you can just save it then you don't need to do anything else you just need to click the results and you will obtain this they might ask you for sign up or maybe login but I have already logged in here so there that's why I'm not asking you so you can just login it's free of cost ok so now we can after we have obtained our location we can also see that how our location looks this is the one that's here is actually our location and the region in the pink is or maybe the red or pink whatever is the area surrounded by our location so this is some extra here we are extra region that we are taking with ourselves in the digital elevation model you might need that because the Walker channels might be coming from long long distances ok so we need to region around our coordinate so now we will download it this is the option for dialog you'll download you can scoot the download I have already downloaded it and you can just open the folder just like this is the folder that I have knowledge so these are all those files that I have got from the website so you can find this folk file that is known as de M in the end so we can just take that file and you can just drag that in the ArcGIS like this so this is the digital innovation model and somewhere here is our point but we don't know where we can just locate it later now we need to open the catalog box here and in the catalog box you need to create a folder connection you need to connect your folder where where you have saved the digital elevation model and you need to interact here so we can just do it by clicking this and you can select any folder here you can click the folder connections there and you can just take this and your folio connection will ask you for the place where I will have saved it so I have saved it here I can open that and you can just show them that location wherever you have saved your digital elevation model recently so it's here oh my gosh okay okay so this is where I have saved it okay so you can see that this is the YouTube lecture I have named it as YouTube lectures I have saved it here and if you click this plus so you will see that these are the two files or a two files that I have actually got through the earth Explorer you can see them here these are doing these are not shown there okay now I need to we need to start the procedure now now first of all what we need is that we need a point we need a certain point and that point will be our coordinate that DS coordinate because as we know that in this USGS in the earth Explorer USGS in digital innovation model this was our location and the surrounding region was not so we need to locate this point here so we can locate it like how we can locate it we need to go to the catalog we need to go to the same folder that is the YouTube lecture or whatever I have named it we can just name it here okay so let me name it so we we can just rename it into project catchment okay okay so now we know this is oh now I can right-click on it and we can click create a new folder in it so this will be all the tools that I am making continues now clicking on the new folder right click on a new folder and again new and in the new you can go towards the shapefile just click on the shapefile the shapefile will ask you for a name so you can just add input so input means that this is the point of our coordinate for which we are trying to find the catchment and this is going to be a point so it is the point is okay and then you need to enter the coordinates so you can just click on edit and you can just add your code here now how are you going to add the code Eames this is the main point you need to go to the geographic coordinate system so once you go to a geographic coordinate system here you can select the world and in the world you can go to WGS 1984 you can just make it your favorite I have already made it my favorite so it will be already always on the top so just right-click on it I guess and you can just add it to favorite okay so I have already made it man so you can just okay it and here we go it is now in the form of W so this is the unit for our coordinates okay now we can just locate and we have worship now we need to enter that point here somewhere here how we're going to enter it we're going to click on this editor at the top and in the editor we need to click start editing so this will load our editing box it's still loading this this might take a little time now you can go towards the catalog again and you can clip the input and in the input you can just normally you can just go to the this this point this is known as create features so once you click the start editing then you have this option which is known as create features you need to click on create features and now you have got your input so you can just click the input and now you can come towards your digital elevation model so you see that here we have a point that we need to look at somewhere but we don't know where we need to place this point because our point is somewhere here but we don't know but we know the coordinates of that point so we can just enter the coordinates but how having that point here individual elevation with model we can just right click here and after right-click you can just see the absolute X comma Y let's click them advil coordinates if you click this arrow you will get if you click this arrow so you can just a let me just let me just make it okay so if you click this arrow here so you can see you have different options for entering your coordinates so you can see that our data was in the form of degrees minutes and seconds so you can just click this as you can see here it big Riis minutes and seconds so we will just click this arrow here and we'll enter in the form of the degrees minutes and seconds so my coordinates are 71 24:04 east so i will at 70 124 and then we have 0 for east and then we have 30 for 18 and 18 let us see again 34 18 18 north and it's already not so these are the coordinates that we are having so now we can enter it we can just enter and here is our point wherever our location is so you can just see it it might be quite matching with this one ok so now as they are located or point now we can just come to the editor we can just click on save edits and we can click stop editing so it's the hair is over point okay so now after we have got our point here so the next step is that we need to start or we need to reduce the area around our point and why we need to do that because if the area is too much so the software is going to take a little more time from us so we need to we can just reduce the area and we need we can just lessen the time and effort that the software is going to take doing that so if you don't want to do that you can just not do that but I am just assuming that my area is going to be not that much so I'm just going to reduce that so how you can reduce that I'm going to show you but if you don't want to do that you can just skip this step and you can just do it for the whole data elevation model so how are we going to reduce that area you can just go to the catalog you can again click on a new folder and you can just click right click on that adding new again going to a shapefile and this time I'm going to name it rectangle rectangle and I'm going to instead of point we were going to give that polygon and this time we're not going to cut that eat it we're just going to okay so done so we have got our rectangle here now again we're going to click to start editing and we're going to click on create features and this time we're going to click on rectangle and here you can see the construction tools you can just select rectangle so now I can just assume that and I hope that my catchment is going to be somewhere here in this region so let's see if that works if that doesn't work sort of the region is out of this rectangle and in the end you just see that if the region is out of this rectangle you can just come back to this step and you can just increase the size of the rectangle or whatever you think you can just do that so I'm just showing you that you can also do it like this okay so I have just created my reckoning now I need to extract this rectangle out of this digital elevation model I need to remove the background data so how are we going to do that we'll go to little group we'll go to the search and the search we will click will enter clip and we will search it so once you search it you can see that we have these tools you can just click the turbine that is clip data management so you just click on the clip data management it will ask you for the input and the output raster so the input raster is of course the whole digital elevation model that we have it is the total input so we're going to add the data in here like this and now we need to enter the output extensor output explainer is going to be this rectangle of course so this is going to be our output so we can just add the rectangle as our output and now we can just click ok so it is just performing the clip and once it's done see we will be having a notification here maybe or maybe not so as you can see at the left side we have got or clipped elevation model so now we can just click on this stick and once we uncheck this so you can see we have only the rectangular portion with us and if I uncheck this rectangle so you can see I have only this digital elevation model having my point and some region around that point okay so now we can just remove this also but I'm not just removing it so now we can just continue our steps in this weekend okay so now we need to go to the catalog again and know we need we don't need to go to the catalog again but we need to go to the arc toolbox here okay and here you need to open the spatula and Alice tools so it is open that and the special analysis tools you can just go to hydrology and in the hydrology you have these tools that we're going to use for finding the catchment here so the first tool is the fill tool so click on the fill tool double click and enter your input surface roster so the input surface rosters the clipped one okay not the initial or the clipped one and just okay so it is going to perform the fill and the time that it takes depends upon the data that we have given so that's why I cropped it so that it can take less time and I hope that my reading is not going to be out of this rectangle okay we're going to see it in that so the clip is or the fill is now performed now the second one is the flow direction so we need to click on the flow direction again we need to enter the fill one the updated one is going to be added okay so the fill is the updated once and we need to add the fill and okay and now it's performing the flow direction and it will give us the flow directions as it is completed okay it's done so this is our flow direct desire over flow direction you can see get different colors and these are all the data also that okay now the next step is we need to add we need to click flow accumulation so let's click this we need to add flow Direction roster so that is this one flow direction and we can then again okay so here it's going to perform the flow accumulation and remember that this step needs some time so you need to wait for it okay so my I have just I just paused to recording and out and this back after the flow accumulation has been performed so now the next step is that you can just zoom in to it and we can just see if we see that my point and my point is here and this is this if you see this white a little light colored line this is the raster this is the line from where the drainage from where the flow accumulation is happening so I need to drag my point and I need to put it somewhere here if my point was already there it will the okay but it's not okay so I need to go to the editor I need to start editing and I need to click I need to go to the I need to click this one this option there's just that black one and I can just click on my point like this and then I can just drag it and bring it somewhere here on this line so do you see so now it's on that line now I can enter it I can just save edits and I can just stop editing so my point is here now now we can unzoom it you can enter it back so now as we have located our point on that line so the next step is that we again need to go to the tools and there is another tool that we need to use that is snap or point so we'll just click on this snap or point and we'll double click it and after double clicking it in this dialogue box we are being asked for input roster or feature poor point data so the input rust and the second one is that its input accumulation data so you know that input raster or feature poor point data is of course or input so we can just click on this input and that input is the initial point that you made okay so you just click it and the second one is the input accumulation roster so for input accumulation roster we have we were having this flow accumulation so you can just click this and you can just okay it so now it will take some time and it will be performed and we will be shown a snap for point here I'll try to cover another video on the on description or of the detail of these tools that why are we using these different tools like fill flow accumulation flow reaction I hope you guys might know it but if you don't so I will try to make another video on detail of these tools and specially the units so let's see so so our snap pour point have been performed so we have got our snap pour point now the next step almost a few of the last step is that now we need to go to the watershed which is the catchment actually so we need to click on the watershed or a catchment you can and now we can click on the snap or point here the input is head now as the input is change from this input to the snap point and the second one is the input raster or the feature poor point that house oh I'm sorry seriously this is the flow direction so input flow Direction is going to be the flow direction here and the input raster or feature poor point that is going to be the snap profiler I am sorry for that okay so now we can just click it okay and now this is being performed so we will get a watershed right after this step so let's wait for it and here we go so here is our water shedding this blue color or you can say the catchment let's change will change the color for this okay like this okay now let's go to next step quickly we need to change this from from raster to from raster to polygon because this data is in the form of raster and you might know what it arrestor is but if you don't know if you covering it in next video because it'll take too much time so we can just go to the raster input raster and an input raster will give the watershed because raster is actually the data in the form of squares etc so we can just click it and really just change it into polygon instead of roster because this data is in the form of roster so now it's changing to pull it on now you can just uncheck these because we don't need them and we have got our area in the form of a polygon and stuff instead of a raster data that the software was using now we need to quickly find the area so first of all we need to have our units at the beginning we used the units that were in geographic coordinates now they're going to be projected coordinate system so let's go to the layers will click if you right click on the layers go to the properties and in the properties we will this time instead of going to a geographic coordinate system we are going to projected coordinates and because because actually now our data has changed to projected coordinate system so in and why it is I will try to cover the video in this but let's just go to projected coordinate system and in the projected coordinate system you will have to go to the UTM to UTM i already opened it so that's 5:30 UTM in UTM you need to go to WGS 1984 and in this you need to find your own UTM zone for your country and for your location you can just search that in Google or whatever I found it and my country's WGS a UTM zone is somewhere here in 43 so I'm just clicking it okay this is for Pakistan so I am clicking it and apply and okay so this isn't done now we need to find the area so how we can find it you need to come to roster watershed right click on it you can go to the open attribute table and open attribute table you need to add you need to add oh my god as a stake in time okay you need to go to add field and when you click Add field you need to clip the area and you can just click on double or float and then okay now click on the ear we are right click on the area code calculate geometry and yes it and then here you can enter you know so my unit is square miles so I am just clicking on square miles and it's okay and yes so we've got over here and square miles that is 14 point forces or this other areas and or procedure is completed so we have caught our area now you can also convert this into and you can just take this into do what we call it Google Earth you can move it to Google or tau you can click on the from KML no no no you can click on to KML and you can click on a layer 2 KML ok so layer layer to Kemah click on it the layer will be the raster watershed okay and then just specify your location wherever you want to save it so so now as I have saved it and I say bit on the name of Google Earth let's open that files there is it so let's double click it and now we'll wait for Google Earth to load it so let's see how it looks in Google Earth here we go and here is our catchment area and our location and everything on Google Earth and you can just play with it as you like just like it is over here and look at it 3d and wherever so that was all from my side about the catchment area we found the area in units and you can again just go to the properties and you can guess or island I mean you can just go to the attribute table and you can just search your area by going to the attribute table here it is and that's all forty point four miles square miles catchment area or location thank you very much [Music]

Channel: AKCollege

Views: 2,088

Keywords: arcgis, gis, qgis, hello, pakistan, google, google earth pro, earth, ArcGis, Arcgis, lectures, engineering, Civil Engineering, Civilengineering, civilengineer, civilengineering, easy lecture, long videos, educational, education, software, softwares, video

Id: aQr19pTnx0k

Length: 25min 18sec (1518 seconds)

Published: Sat Mar 09 2019