Creating GeoReferencing Imagery using Free QGIS Software

hey this is scooter I wanted to do a short tutorial video which won't be very short to teach people how to do geo referencing of images map stuff like that so it's something I tried to do for a while and couldn't figure out exactly how to do it I heard that you were supposed to be able to do it through Google Earth Pro but I never did quite figure that out obviously you can do it with some some expensive GIS systems like ArcGIS stuff like that but a lot of us don't have eighteen hundred dollars to just spend on a software suite like that just for fun so anyway what I did was I eventually found a way to do it and so what I'm gonna teach you is the very basics and it's gonna be using free software for the most part free so the different programs and things that you're gonna want to know how to use or you're gonna learn how to use for this whole process there's three or four the most common one which are not going to really explain a whole lot is offense maps and a lot of planter's know how that works basically it takes a different types of files like a TI FF file or a PDF or I think PNG is work also so some of those types of files they can be geo-referenced which means that in addition to the image geographical information can be incorporated into the file and so when you load the map into or the image into this program called a Venza maps it shows you exactly where you are on that map and so it's very much like Google Maps but the advantage is you don't have to have cell service to make this work so you do have to have a cell phone or a tablet which has a GPS in it and so if you're talking cellphones pretty much every smartphone nowadays has a cell that has a ton GPS if you're talking about tablets something that's a Wi-Fi only tablet will not have a GPS but if it has the ability to take a SIM card and to work on cell network then it should have a GPS unit okay so like I say you don't have to be in cell service for this to work so this is how foresters are creating maps of stuff out in the middle know where we can load them onto our mobile devices and using GPS technology we can see exactly where we are on that map and the reason it works with outsells technology is because gps satellites up in the sky they they don't listen or talk to devices on the ground all they do is broadcast a signal now there's I think about thirty two of them right now and as long as you've got at least four of them in the sky above you at any given time broadcasting signals all the different devices on the ground receiving those signals can figure out where each of those devices are individually okay so looking to events Maps if you haven't already learned how to use it a second thing that is useful but not critical is you could have a GPS app on your phone and there's lots of free ones there's just go on to the Play Store the Google Play Store or the Apple Store and look for one look for one that's got a high rating and that's free and most of these you know it just does the same function as having a handheld GPS like the government or something like that you can just hold it take a look let it get it's reading and you can see exactly what your latitude and longitude are okay so that's useful but that's not critical for this tutorial a third thing that's very useful is some image editing software now I'm gonna use Photoshop just because I use Photoshop every day and it's like the most important program in my life so the only problem is Photoshop you have to buy and so a lot if you won't have Photoshop on your laptops any free image editing program will do and basically all you need is the ability to bring an image in and save it as a different type of image that can be useful being able to crop an image is useful because you know say you've got a huge image and all you're interested is in is the part in the center like a certain block or something like that a certain feature so you may want to be able to cut off all that extra stuff so your file sizes are smaller so cropping resizing you know just the basics for image editing you may also want to be able to texts and lay it onto your image before you go through the geo referencing process that's handy you may be able to or you may want to be able to draw lines polygons shapes points stuff like that that can be useful too I don't do that very often I'm usually just interested in getting the image that I'm turning into a map cropping it down to a decent size there's no ice cream foam and then saving it and then going on ahead with a different software package due to the geo referencing what else much you need I think the only other thing is the geo referencing software so there's a package called QGIS which is free it's an open source there's a whole group of coders around the world that have been working on this developers working on this for a while for several years and they've turned it into a very comprehensive package it's available for mac for Windows stuff like that so I'm going to go through the process of trying to install it on this laptop you know I have been using I uninstalled it so I could go through the process of reinstalling it on screens you can see what's going on most of it to speed things up I'm going to put on fast forward or skip big sections okay so let's go let's go to the laptop and start looking for the software and by the way if you if you're looking for tutorials about QGIS just do a search there's all kinds of them online a lot of them have files that you can download and play with shape files graphics files comma separated value files all sorts of things that all relate to stuff that QGIS can do now I'm going to assume that you know a few basics I'm gonna assume that you know what latitudes and longitudes are and that you understand how GPS is work if you don't know anything about GIS that stands for geographic information systems this Volks GIS for dummies it's tedious it's boring it was painful to read I did learn some things from it so some of the biggest things you can find online I would say the biggest thing is if you don't understand the difference between raster and vector files that's something that you want to research short version a raster file is anything that's an image like a JPEG a gif that sort of stuff a vector file instead of having all the pixels they're colored in in the image it basically uses mathematical formulas to express how an image or how a graphic comes up on the screen so it's good for things like perfect circles triangles things like that but we're gonna be working mostly with raster images today so yeah that GIS book tedious but if you don't know much about GIS learn about it somehow you don't have to use that book another thing QG is a tutorial book this is quite good it's actually very good but you can find a lot of that stuff online for free also so you don't need that book you have to understand what else I think besides understanding GIS stuff I think it's very important that you understand a fair amount about computers in general like saving files all that sort of stuff yeah anyway let's go into let's go into the QGIS so QGIS project Tod org we're going to look for download now going for Windows yep who knows I'm on Windows standalone version wait a sec I'm not going to do that I'm gonna take the 64 bit while this is downloading let me explain one more thing that you definitely need to start learning to understand and it's kind of complicated I don't fully I'm not fully comfortable with it myself very confusing but it basically relates to coordinate systems and around the world there are literally thousands of coordinates systems that have been used from you know five centuries ago up until the modern time depending on what time period you're looking at where in the world you're looking at the Preferences of some of the local government officials things like that there's all kinds of different coordinate systems and so basically these coordinate systems are offered often called like reference systems or dadums within those systems there's also variations called projections and so basically you have to know whenever you were working with any coordinates you have to know what system they're in and quite often there's a whole bunch of different types of systems that are very similar but they're not perfectly similar so for example I think there's a system called nad nad 27 North American data in 1927 something like that that standard was updated in 1983 in the United States and so all of a sudden a lot of people started using nad 83 the difference between the two systems like in one state in New York it might be that the new system all the coordinates are 2 meters to the east and ten point four meters to the south compared to the original system so there's a lot of really weird stuff happening so a couple of the systems that are really commonly used WGS is a common one and another one is the UTM system now WGS latitudes and longitudes a lot of you are familiar with that those are part of a WGS system okay you TMS uses a different thing where all the measurements are in meters let me show up a map of the world okay so you can see all these different numbers and then for each number you can go up or down to different letters so if for example if I'm looking for something in Nova Scotia I'm looking for number 20 and then up to T so 20 T is the grid the UTM grid that I have to use if I'm doing work in Nova Scotia if I use a grid like 13 s and try to use coordinates from Nova Scotia it's not going to work it's gonna give me something in Utah or some ridiculous place that's not applicable okay so you do have to learn about Adams projections reference systems things like that specifically latitudes and longitudes and UTM is both very helpful to know one other thing that's very useful to know is how to convert between different types of latitude and longitude so hopefully you're familiar with the format of lats and lungs so its degrees minutes seconds okay the number of degrees around the world you can only go up to 180 okay degrees if you're looking at longitude that's away from a central line that runs north-south approximately through Greenwich in England okay as you're moving around the world to the east from Greenwich the longitude lines are called East as you're moving to the West which is all of Canada they're called West eastings Westing's things like that and something interesting if you're using things like Google Maps and a lot of different software systems the way to differentiate between East and West is the numbers for the West which is Canada all have to have a negative sign in front of them so if you have like a negative 63 degrees of longitude we know it's West instead of somewhere in Istanbul or somewhere over there because it's got that negative sign now if you go into a different system like you TMS they do not require the negative signs because each grid is its own little self-contained unit okay so with latitude and longitude make sure you understand degrees can go up to 180 and the unless you're talking about north and south of the equator latitude those only go up to 90 if you're talking about minutes there's 60 minutes in a degree now all of these things can be further broken down into decimal points so you could have something like twelve point four seconds okay that's part of a bigger latitude or longitude so let's say it's 35 degrees 14 minutes twelve point four seconds okay so that does well works out now sometimes they will lop off the seconds entirely and instead of having an integer in the minutes plus the seconds they will just turn the minutes into decimal notation so let's say that you know there's 30 sorry 60 seconds in a minute so let's say that you've got a coordinate like 35 14 minutes 30 seconds okay so that's 30 seconds if there's 60 seconds in a minute and you've got 30 that's exactly half so instead of 14 minutes 30 seconds you could also go 14 minutes plus half a minute so fourteen point five okay that whole concept can also get carried on the degrees can be turned into decimal and the minutes and seconds both left off so you may see a notation something like fourteen point two 375 degrees which kind of make sure you understand what the minutes and seconds are if you do a little bit of translation mathematical translation so it's a little confusing but make sure you understand that before we get into some of this other stuff okay so here's our setup file downloaded it's pretty big it's almost four hundred Meg's some take a while to download anyway running it as an administrator just to be safe installed next I agree now now I'm not going to solve these American data sets I'm just gonna go install okay everything's installed now let's put this short top shortcut on the desktop so it's easy to load up so double click start it up restoring loaded plugins so this is the important thing when you start this up for the first time we're going to want to go into the plug-in manager right here plugins gonna go to manage and install plugins and it's gonna be talking to the internet right here okay so we've got all these different plugins and you can see the status symbol on the left here installed not installed settings okay there's a couple key plugins that you're gonna want ok geo-referencer GDL this one you have to have so if you do not if it's if it's still green click on this go down to install plug-in now here's something important this X it looks like it's turned off right well no that is turned off and to turn it on you click it and put the X in the box so I don't know why they didn't put a checkmark there that would make a lot more sense but anyway X means turned on so gdal Tools is good to have turned on geo-referencer is good to turn on I think they're only turned on in mine because I have the software installed before GPS tools is useful interpolation plug-in oh I should turn that on made a search catalog client make sure it's turned on openlayers plug-in but that's really quite important and Oracle spatial geo raster are useful processing critical that's got to be working quick map services that's critical that's going to be working so the main three that that you absolutely have to have our processing quick map services and geo Efrain sort of GDL make sure all three of those are set up okay so what we're gonna do I'm gonna go through two projects first I'm going to create a map from Google Earth and I'm going to just do something in town and we'll do it from where I'm filming this right now so that I can go afterwards and double-check and make sure that it worked after that I'll do something on a bigger scale like sayin OSH national park or a provincial park or something like that so if I was going hiking I can put it up of the whole thing and show where I am within the park so what we're gonna do first is go to the web setting and we're gonna go to quick map services and you can see that there's a whole bunch of options here when you first install QGIS you're probably only gonna have four or five options this is not enough okay you want more so what you're gonna do is you're gonna go under quick map services you'll go down to settings and then this will pop up and you go over to more services and then you're gonna go get contributed pack and it's going to automatically get and download and then you can save clothes and then when you open up again you're going to see this full list that you didn't see before so that's important so let's go with something that everyone's familiar with Google there's also things like Bing things that maps and satellite data but we'll go with Google we'll go to google satellite and loads up ok so I'm going to use my selection to my zoom tool and I'm going to highlight drag and drop and there we've got Nova Scotia I'm going to drag and drop again and we're zooming in to a place called Truro which is where I'm filming right now okay now I just have to figure out exactly where we are okay I'm gonna take the section of the map right here this big square is that gonna work yeah I think that'll work pretty good okay so that is the background map that I'm going to be using now because this is coming from the Google satellite data this map it's like basically having Google Earth opened up inside or Google Maps open up inside QGIS so this data is the same as Google Earth your maps it has the lats and lungs associated with it and so if you move your little cursor around on the screen you can see down here the coordinates are moving okay now what I want to do next is I'm going to create an image and so the image is going to be the basis of my mouth okay so to do that I'm gonna go into actual Google Earth and I have Google Earth Pro which you can get for free now and so I'm going to pick an address within that square okay so we can see the same square so I mean Google Earth now I've got my square and I'm going to use this square as the basis for my map now I'm going to try and play with this a little so it looks like I'm walking directly overhead view everything I can see is on the screen that's good and so to save an image I could do a copy print screen if I wanted but let's go to save image and you can either click on this icon or you can go to file save save image either one works okay description for the map well let's call this geo reference test scooter okay so now that we've got that see this little set of options so we're going to have all those things saved yeah I like that that's fine whatever resolution we're gonna go to the highest possible resolution maximum and then save image and so I'll just save it on the desktop and i'll call this background image Truro and I'm saving it as a JPEG so this is nothing fancy there's nothing on this map we'll go to the desktop all this is is a jpg okay so there's no geo referencing in it nothing but we're about to do that so let's go back into QGIS now you're going to want to open the geo-referencer plugin so to open the geo-referencer plugin you may see a tic-tac-toe board icon on one of the menus top left right sided screen something like that so I've got it so I could click on that to open the geo-referencer many of you may not have that and so the other way to do it is to go into your raster menu because we're going to be opening a raster image a jpg is a raster so we'll hit that and you can see geo-referencer geo-referencer so click on that so now we have basically two different programs open we have this geo-referencer plugin which is one program and we have qgis in the background and we're gonna flip back and forth between the two so within geo-referencer your first thing this is your open dialogue this is your processing key this is to save and load GCPs which are ground control points this is your transformation settings and here's some drag-and-drop and zoom tools okay so let's go through this step-by-step first we're going to open a raster and so I'm gonna go to the desktop and I'm gonna get my background image and you're supposed to be able to set the proper coordinate system here but because this is just a JPEG it doesn't have coordinates so what we're gonna do is to cancel okay and so my image my JPEG is now in the plug-in so remember this plug-in has a JPEG which has no geo referencing QGIS in the background has Google Earth so it has all sorts of information in it and we have because we're trying to correlate the two I've got the same sort of imaging same area in both so what I want to do now is I want to do a bit of zooming in and I'm gonna pick five different places and I'm going to add points okay so this is a little convenient store here I'm gonna use this crosswalk and I'm gonna add a point there so I go to the add point tool and then I put the point there now if I know the latitude and longitude I can put them in here now and so you can do this in full decimal notation you can do it in which is like that you can do it in degrees minutes seconds notation remember because we're in Canada you're gonna have to have a negative number for the east within the latitude and longitudes if you're doing UTM s totally different system anyway I don't know the latitude and longitude of this I could take my phone or GPS unit go down to that corner and get a reading and then I know what it isn't type it in but I'm gonna go from the map canvas so what this does is goes over to the GIS QGIS program and lets me pick a point that way okay so I'm zoomed into the same area let's uh let's go back to the plug-in so from map canvas and then I pick a point right there and see how it's just populated those two fields with the exact latitude and longitude so easy then I hit OK so flipping over to QGIS let's see where it next one's gonna be we'll go over we'll go over to this car right here pinkish car okay so that's where the point is gonna be so in the plug-in add point click on the car get the coordinates from the map canvas done fills in the blanks ok so we need to do this with a fair number of points it'd be nice to do it with at least five points let's go up here well across from oK we've got this intersection up here above that house and so we will find that on here too hey is that the same intersection yes it is okay so we're gonna go to the plug-in we're gonna press add point we're going to pick the top of the stop line and then it's putting the coordinates okay so we have to do this with two more things now I'll say load a little bit maybe it'll make more sense to you okay so our next point let's go across this and we'll use that line over there move so I'm gonna pick that point there add point in the plug-in and bring it from the map canvas okay and we'll do one last point we should have five just to be seeing it boys Avenue so within the plug-in pick point okay there so now if we zoom out we have five different points picked at this point we have one here one here one up here went over here and one here and there tied in to the proper coordinates so you can see down here the latitudes and longitudes have been punched in automatically by the software so the next thing we're gonna do I'm gonna save that set of coordinates and so to do that save ground control points and so let's just put it on the desktop and we'll call it row points okay there save just in case we have to load them up again now next step is we are going to process stuff now if I start processing now without having gone into the settings it's not gonna work it's gonna say you need to set the settings so watch please set transformation type okay so there's a bunch of different choices here and the best choices are polynomial one two or three you can only use polynomial one if you have five points or less and since we only have five points I'm gonna have to pick that if you have between six and nine points you can pick number two which is better it works a little bit more correctly the algorithms and math behind it and if you've got at least ten points identified you can use polynomial three which works the best so I certainly could have taken more time to add ten points to make it work well but for now let's go with polynomial one we only use five points then you take your resampling method and I found so far that cubic seems to work the best okay now the next thing is target SRS so if you go back well we can't do that easily right now but if you go back into QGIS you can kind of see down at the bottom corner we've got this epsg number 38 50 okay that is the coordinate system projections down and whatever that google satellite is using right now and so we want to do the same thing so let's see if we've got that we do 38:57 now if that wasn't up here as one of her choices let's say that we were looking for twenty eight six forty well I don't know twenty twenty-nine 61 let's see if there's a 2961 data there is it's one of the nad83 s okay so I could double click that but you know that's not the right one we don't want 2961 we want 38 57 to match down here now output raster this is what we're going to have as our output map so we're saving it to the desktop I'm gonna call this Tarou image geo-referenced now in our drop-down menu our only choice is geo TIFF and I know with avenza's PDF maps I'm very used to working with PDFs all our foresters give us your reference PDFs not geo tips don't know why I can't save a PDF that's geo reference but for some reason at the moment I can't doesn't matter it still works geo Tiff's work in a Venza loading huge es when I'm done yes generate PDF map I've played with this all this does is generate a data for error correction stuff it has nothing to do with creating the mouth so I'm gonna leave that blank I'm not going to change my resolution I'm going to have this checked use 0 for transparency when needed and then what's all this stuff is done hit OK now you would think we must be done right now well we're not done because we haven't processed it yet now before I go any further I want to point out one thing here and that is that we may have a mistake because look at these lines that's a lot of red and so it shows the error in the pixels let's turn some of these off and see if we put a mistake that we can get rid of now right now the errors are these big numbers I would rather see errors down around 1 or less so let's see what happens when we get rid of some of these well that's a big number still let's try get rid of this one no that doesn't help get rid of this one no doesn't do much rid of that no get rid of that ok well if we turn off that 0.4 at least we have a lot lower numbers here so I think that's maybe a good thing so I think now 0.4 was our last point you can see this one here and see what's happened I've actually put it in the wrong location ok I picked a crosswalk but I picked the wrong one so I'm gonna leave that turned off to make sure it doesn't screw up my mouth and because I've got this turned off I've got point point point point those all have almost no red line attached to them so those are fairly accurate okay so I'm gonna live with this so now let's process it we've already set up all our info here a process there and it should be created we look at our desktop and we've got truro image geo-referenced we double click on it well it just looks like a normal image but you can see this black border here and up here it's because the image has been warped a bit to match reality with the geo referencing process so let's try let's take that image a true image to your reference I'm gonna drag it over to Dropbox I guess I can't do that right now because the software is open so we'll close the software projects good we'll move that into Dropbox and in the YouTube tutorial folder on Dropbox I have true image georeference now that's pretty big 41 megabytes you know images once you start getting over a hundred bags some devices really I have problems with them so I wouldn't go much bigger than that but anyway this seems to be good now there was an option when I was in those transformation settings where I could go with compression and compression would have been smart I should have turned it on because if I used one of the compression settings this image probably would have been three or four megabytes instead of 40 so that's important to use so at this point our image has been uploaded into Dropbox so I'm gonna go to my tablet and on the tablet I am going to okay so on the tablet I'm gonna go into Dropbox and then we're gonna go to YouTube tutorial true image geo-referenced oops I'm going to make this available offline first of all okay so now it has been made available offline we're gonna open with PDF maps get rid of these other maps we don't need those so TRO image do you referenced now processing okay shows that I'm on the map open up look I am on the map because that's where I'm sitting as I'm doing this video okay so that's a good sign so we'll take this out into the jeep and we'll take a little drive around and we'll see if the accuracy is pretty good so at this point you know how it's done let's do one more example just to walk you through once more just in case and this time what we'll do is we'll assume we're going hiking we're going to fund a national park in your Brunswick so Fundy Park let's let's look on Google and if you look at a map of Fundy so this is the outlines so we go from Alma down to this little tributary and then we go up to the corner here on route 114 and then we go to Tian's corner I think these what that's called so let's search for Fundy okay so here we have Fundy Park now because we're in Google Earth see I've lost my my menus here it's because this thing's open so I'll kill that all these controls come back I'm going to make sure that we're looking down vertically we are and you can't really easily see where the boundaries of the park are right now but that's okay teens corner yeah so first I'm going to export the image so I'll go to this save image I'm going to set the maximum resolution that's good and then I'm going to put this on the desktop background image Fundy okay I shouldn't need Google Earth anymore okay so once again we're gonna go to web quick map services Google Google satellite we're gonna go to zoom in on Fundy where are we okay that's pretty good so let's zoom in a little bit more move up okay so this point is one that's gonna be useful to me in a minute so we will load the geo-referencer let's go to raster geo-referencer geo-referencer we're going to import our background image background image Fundy we don't have a coordinate system in it yet so we're gonna get cancelled we're going to zoom in somewhat so we can be more accurate with our points okay so that's where our first point is going to be and can we see it on our satellite imagery yes okay so add point point from map canvas point okay now let's move over quite a bit to T in this corner okay so we're gonna set a point right in the center there I really should be zoomed in more to be honest if I want this to be accurate but you get the immediate you get the idea of what I'm doing and then from teams quarter let's go down to Alma and in Alma let's use that intersection there oops that point and finally our fourth point will go all the way over to that tributary in the southwest quarter Thanks zoomed out a little further there well you can see my three dots quite well my three ground control points I should call them lot dots okay and there's our last point we'll put it up at the top of that tributary okay so are we gonna save our points yeah we may as well save ground control points so we'll call this funding points and then we will go into our transformation settings and we're still gonna go with polynomial one because we only have four points remember we need at least six to go to polynomial two we're gonna stick with cubic we've got the right e psg code that's good output roster well I'll save this on the desktop and we'll call this funding Geo well it's not really about well it is now on the image geo reference it's a good name for it and compression pack fits okay I do have compression turned on there you go I thought I didn't and we're gonna process it okay and let's see what happened do we have the desktop funding image geo-referenced let's double click on it okay so now because I want to test to make sure that worked I'm going to close out QGIS I'll discard the project I'm going to move the funding image into my Dropbox folder it starts uploading I'll go back to my tablet now this time I'm not gonna be on the map because that's up in your Brunswick and I'm in Nova Scotia so we should get an indication on the screen here in a minute of how far away the map is and that might also give us an idea of whether or not it worked well because if it shows that we're 13,000 kilometers away from it we know there's something wrong that happened when I was playing around with this earlier this weekend it's kind of a frustrating bit of software to play with at the start till you start getting a little more comfortable with it it's easy to make mistakes especially with the production systems with the dados references yeah very confusing and that shows that we are a hundred seventeen point five kilometers away from Fundy okay so if I was off hiking I now have a geo-referenced map that it doesn't matter if I don't have cell service I can take my tablet and I'll always know exactly where I am now there's other things that you can do a reference I mean I can geo-reference a photo of a dog if I wanted of course doesn't do any good because it makes no sense but let's say I've got a woodlot that I own and here's the official survey document and this is interesting I'll put this up close up on the screen but it's got all these different points here and these points have coordinates and these are in northings and eastings these are New Brunswick grid coordinates it's not the same WGS system but Google Earth is using but you can punch in I can stand this map which I've already done actually scan the map bring that image into QGIS and instead of doing that thing where I'm copying from satellite data I can just manually click on each of these points and just manually enter the coordinates of those points and geo-reference them out that way and so I did that and it worked you could also depending what province you're in there's different things like New Brunswick has Gond and that's a pretty cool site it's got this map viewer thing and so if you open up the map viewer I can zoom in and I can find this person so let's uh where are we okay right up here there we go so this parcel right here PID number zero nine zero zero nine zero four one six nine that is the same as this one and so what I could do is I could zoom into this a little bit and then I can let's say that I want to use a little bit better background so I'll use aerial background okay yeah I like that and I'll leave that highlighting there so I can see the boundary so I could do a control print screen and then I could go into Photoshop I can create a new image paste my screen capture in flatten the layers I don't need all this extra stuff so let's just crop that a little bit image prop and then I can save this desktop I'll call that Walker Road woodlot background and now once again I've got a JPEG that I can work with I can go into QGIS I can open my geo-referencer import that image walk a road that girl okay and then for the points instead of referencing something else I can click on the point and then just manually punching this information so at the top top corner so I would punch in the coordinates point 310 northing and easting and then I'd go on to the next one and push in that one and then I would go on and punching that one and so on and eventually I've got another geo-reference map this one with the from a different source other than Google Earth I also have if you look at this so I did another one of the same thing this is from Google Earth data from just a few months ago back in the fall and you can see all the all the leaves are turning on the hardwoods and so that's why I picked that one if you go into Google Earth you can actually you can change the historical data and so to do that so to do that you can see this that's that's that woodlot that I was just looking at and you can see down here it's got 2012 well that's because there's all sorts of different versions of Google Earth imagery so this was obviously taken probably in December May oh no sorry March 23rd 2012 so you can still see some snow on the ground we can move up well that one's hurt you identify that's pretty foggy that's pretty lush that must be summer where it's 13th June 18th August 29th there we go 1014 2016 so that was taken on October 14th of 2016 and you can see all the hardwoods and so I figured I was gonna use that as an image because it was really it was really easy to see as I'm walking through the bush the difference between the hardwoods and the soft woods and so having this map color coded was quite helpful and so what I did it's brighter on this one obviously and that's just because I've imported it into Photoshop and turned up the vibrance so I can see those color differences a little bit better and I also on that woodlot I scanned the survey and then just took the good part and so I do reference this so I can also use this so as I walk through that woodlot on my tablet I can have this survey thing and I can see if I'm on the lines as I'm moving back and forth now the accuracy of this is not always great certainly if I was flagging a line to harvest a bunch of wood off it or plan up to a boundary I'm not gonna want to harvest wood 20 feet into somebody else's wood log on the other side because my neighbor would be pretty pissed off so I would want to go with actual land surveyor data for something like that but if you want a rough idea of where boundaries are this is pretty handy so I think I've gone into this in a lot of detail I think the things you're gonna find frustrating is again that atoms and the projections and stuff so you'll have to learn that stuff a little bit better but if you're doing the basic approach using google satellite data then you don't have to worry about translating anything it's only when you start going into old survey plans and data from different sources sometimes that you have to get get a better understanding how that all works also this is better for bigger things like the National Park example I use it's not really good if you're trying to identify the corners of a property you're gonna be off a little bit but you know sometimes being off by 20 feet isn't that important when you're trying to get a rough sense of where something is so there's a lot more I think I have to learn about this but hopefully this is enough to get you all started with making your own geo reference documents and thanks for watching you

Channel: replant

Views: 4,001

Keywords: geo, reference, georeference, referencing, georeferencing, map, maps, gis, qgis, arcmap, arcgis, mapmaker, pdf, tif, tiff, geopdf, geotif, geotiff, avenza, geographic, information, systems, digital, gps, global, positioning, system, geography, google, earth, satellite, bing, database, online, create, produce, build, make, educational, tutorial, education, lesson

Id: bmmmw9DAX3g

Length: 55min 46sec (3346 seconds)

Published: Thu Sep 07 2017