ArcMap 10: How to create Profiles using a DEM - Channel cross sections! Ground Truthing! YAY

hello hello thank you for joining again today I'm going to show you a fun feature using the 3d analyst um tool bar right here I've just added and just in case you didn't watch my other videos don't forget to enable your extensions feature just go to customize extensions and check box 3d analysts then to access a toolbar just click 3d analyst by right-clicking your general menu it'll bring you this toolbar right here where you're gonna have all access to everything I like to tuck my toolbars up on the top because I just find everything kind of moving around and shuffle to do this feature first I just want you to change your your actual target to the one that to the DM that you're working on for me this was the one that we preemies previously did in a different video where I had a DM and then I try to clip it and then it basically said correct your projection and so this is the projection corrected DM that we generated together in another video so the objective here is really to show one of the great features of using arcmap to do ground truthing and ground truthing is really just a final what is happening on the land and typically people will go out on the field they will have survey meters they will have a GPS to to target locations and when you can use arcmap for it's a preliminary ground truthing step whereby you can look at different features and and target different areas you may want to visit because it looks interesting in your dataset and so to do this the first step is bring up your DL then we're going to go along the top and we have a few features already we use it contours we haven't done the steepness path or the line sight or the interpolation point but the one I want you to look at here is really the interpolate line and this tool allows us to so much step into an edit version and draw line of where we want to analyze the slope or at least the the land features so here what it looks like to be is a channel right here leaning into the Lake Ontario of Toronto if we draw a line across here double click we have a line drawn we can then click create a create profile graph and it lets us and if you actually drop down you can actually see there are more options but we're going to use the profile graph and magically arcmap will actually generate a profile for the line from start to end right here isn't that cool and so if we wanted to say get an idea of what the whole channel is all about we can do more lines so let's do one more here and pull up this graph let's do one over here let this graph and it's not interesting you're just seeing how the channel changes now you might find this interesting if you were a hackers user this is something that you would play around with in Harrah's where you can actually see the channel shapes I think that's the last one we're going to do so you can actually see how changes and so what's interesting as you can see from the start of the line is to zero and then the end of the line is like five thousand something and this is a dip in the water channel right here isn't that interesting and then we have the floodplains right here along the sides and so now you can actually calculate the channel shape you can see that this channel is quite triangular and right over here you can actually see we have a floodplain here and in a second channel so it has a little bit of a little ruffle happening there so very interesting just analyze channel after channel if you love hackers or you're not familiar with it definitely check it out that's another free I'm told analyzed channel hydraulics and I believe there's also a hacker is built into a four arc map I'm not sure if it's compatible with our ten but I've used it with arc nine and it does um enhance your experience with hacker s so give this a try and see how you can draw profiles what I also like to do with playing with this feature and I'm just going to close this but you're welcome to just scroll right back to the minutes where we have these step-by-step channel and you can actually try it on your own by downloading the free geo base data set and then clipping it with the open and free Tron open data regional boundary and and literally just try this out if you look in one of my previous videos I think I use tile 30m from Geo base at 201 to 250,000 but I'm going to just close this and you're welcome to scroll bright back to where we had these open but I'm also going to show you what what's nice and that is really looking at the channel characteristics so we're going to just zoom in a little bit closer because I want to really get the full extent of the channel you can see it's almost like fading but it starts to branches and goes to one we're going to draw a line to represent this channel and we're going to see what the channel is all about so the line is a bit light and faint so it is hard for you to see but you can see my mouse moving across because my DM is black and this one is gray the line that it provides me but you can see now as we're getting down saban that I am drawing basically the channel characteristics and we're just going to go right into the artery right there okay so right there I just drew right right to the meeting point of three different channels and we're going to check out how this looks like it's not interesting so if you wanted to now calculate the channel slope you kind of have an idea where where you're going at and how steep the challenge you can see that there's a drop in the hair I can pull up calculator now we can see that there was a drop of 1.5 minus 85 a 60 meter drop and that was over about 15,000 so rise over run is your general equation and I'll just write I'll just pull that up here so when you want to calculate the slope slope is equal to rise over run so your rise was 145 minus 85 over your run being your your horizontal distance being 15,000 okay there's a little bit math for you and so we were getting about it pointers there before so it's not not too steep that seems normal interesting enough and so you can also analyze this critically but what I also want to show you is really your opportunity just to copy and paste this anywhere you want so you can copy this as a graphic we pull upward and there might be a little bit slow because I can open it up you know and then we can just paste this in hello lady you can basically use this as a quick diagram for reference for for writing about you can also customize this in arcmap before you export so you can actually go to properties and then we can change like a whole bunch of the axes maybe add a legend if you want so I'm just going to press apply but the legend has no meaning so let's remove that we can change so graphical profile let's see that's the first one we can change the line characteristics and I do this and there's no meaning okay and then we lost it anyway we can also change the title of the graph okay I'm just going to hold on I'm going to just redo this default because I lost the whole thing okay we can change the titles so we can say um City of Toronto River X because I don't I did not look at this in advance because I did not plan to make this video too much in advance I just planned to show a really cool feature and then profile subtitles and then you can say um horizontal distance in meters okay look at that and you can use a graph in 3d view so now it's a little bit more you have a bit of a depth in there and you can also just play around really and customize it and then you can also just then copy it into your report so let's copy this a pretty a version in our report because our report here has an ugly title and there we have it we have city Toronto on this mysterious River X because I didn't research before I did this video but you can see how you can actually create profiles or we can look at the characteristics of channels right in arcmap it's basically another way of preparing for your ground-truthing events or checking out the field just before you go you know pick out and point out which features you want to see so definitely give this a try if you have any questions or if you found something really cool definitely send me a message or reply in the comment box below and definitely I will respond almost instantly I'm always connected so definitely give a shout and also feel free to follow along on the Twitter feed and you'll get the like the latest updates of whenever I put a new video up or subscribe whichever works for you thank you for watching

Channel: TeachuGis

Views: 79,080

Rating: 4.8352404 out of 5

Keywords: GIS, ESRI, commercial GIS, vectors, rasters, open data, Toronto, Ontario, Canada, ArcMap 10, ArcCatalog 10, Window 7, cartography, mapping, generating map, map basics, basic maps, x-section, xsection, profile, dem, digital elevation model, channel, elevation profile, channel profile, cross section, pool, riffle

Id: ELmXNrEwKZk

Length: 10min 41sec (641 seconds)

Published: Fri May 17 2013