3D Lines in ArcGIS

welcome back to GIS analysis at the University of Alaska Fairbanks in this session we're going to build three-dimensional lines and we'll simulate a power line transmission where we have four towers so here's our first tower and the elevation at this location is 70 meters above sea level and then our second tower the elevation is 70 meters above sea level and then here's the line from the top of the tower to the top of the tower and each tower is 30 meters high and then we'll go up a slope to 120 meters and then we'll connect a line from the top of this tower to the top of this tower and then we'll go up a slope to 170 meters and we'll connect from the top of the tower to the top of the tower so we're all done we would like to know what is a total length of electric line we need to connect between these towers so let's start with our four test points that we created using the create fishnet tool and we'll label our four points so under labels will label them using the object ID so here we have point one two three and four and then we'll add a field to our points base elevation so that will be the elevation at each location on the ground so our point one will be elevation 70 meters above sea level the next point 70 meters above sea level so here we're on a floodplain at 70 meters above sea level and then we're gonna climb a gradient to our next point which is 120 meters above sea level and then our final point will be 170 meters above sea level so the next step is we'll connect the dots running the tool points to line so we'll make a line between 1 2 3 and 4 input is our test points and our output will be one line that will connect the dots so here's our one line that connected the dots and we could check by opening the attribute table so is just one line so our next step is we'll create three lines a line going from tower one to tower to the line going from tower to to tower 3 etc you can do that using the tool split line at vertices well split our line and I name the output three lines and then if we look at our attribute table for our three lines we do in have three lines our first line our second line our third line our next step is to establish what is the elevation of the line at the start of the line and the end of the line our tower has a base elevation of 70 meters and each tower is 30 meters high if we go up this tower from 70 meters climate 30 meters the elevation will be a hundred and then the same thing with this tower the elevation at the top of the tower will be a hundred the line at the top of this tower 100 meters above sea level top of this tower 100 meters above sea level we need to add those as fields in our three line our first line the top of the tower connecting that with a cable will be start elevation of a hundred and M elevation of a hundred so we can use the field calculator to fill in those value so our next line the top of the tower will be an elevation of a hundred and then 30 meters high it'll go up to 150 our end elevation in this example will be 150 and the starting elevation of the top of this tower is 100 meters so each tower is 30 meters tall so we'll go from 150 meters at this tower to 200 meters at the top of this tower now we can create a three-dimensional long using the starting elevation of the line and the ending elevation of the line pipe field is the starting elevation and then the two height field is the ending elevation and then I main my output electric lines which will be at the top of these towers let's add Z information to double check to make sure we have the correct values that we want we really want the length in three dimensions of our electric lines but as a check what's the minimum elevation and the maximum elevation of these electric lines in the vertex count in this example if we were not accounting for elevation and we just had the two dimensional length we would have to order we would order 34 meters of electric line but since we have a change in elevation we calculate what is the length in three dimensions and that would be a hundred and thirteen meters of wire required to connect at the top of the towers then we could do the same thing with our test points we can convert these into 3d points using the base elevation I'll output it naming it towers and we'll use the base elevation field to determine Z value for each point okay so now we could visualize our towers and electric lines in Ark scene to see them in three dimensions so start programs ArcGIS and then select arc scene add our electric lines and our towers into an arc scene and then scene properties calculate vertical exaggeration and let's make it a little more point one so here we have will make our towers a little larger so let's make it ten point so here we have our towers and the first two towers are on a floodplain so the electric line is horizontal and then the next hour we go up in elevation so this is 30 meters and then the next hour its base we go up in elevation so this is 30 meters we want to do is route our towers to show that 30 meter from the base of the tower to the top of the tower so if we right mouse click and go to properties on our towers under extrusion extrude so extrude every point by 30 meters so that visually shows us the extrusion of these points and then what we want to do is we'll convert these extruded points into 3d lines so to do that we'll use the tool layer 3d to feature class so take our towers that are now extruded in each tower will now become a 3d line so I could remove my original towers now I have the tower symbolized as a 3d line so let's make them brown and let's make them a width of 4 here my towers now as 3d lines and then here are my electric lines on top of the towers so that's how we can easily create 3d lines to estimate for example how many meters of electric line we would need in a tower application or in a mining application you might be mine shafts as 3d lines okay so in our next video session we'll teach you about 3d polygons

Channel: GIS Analysis NRM435 University of Alaska Fairbanks

Views: 3,778

Rating: 5 out of 5

Keywords: 3D Arcmap, 3D features, 3D ArcGIS, XYZ

Id: wk3eB71eXI0

Length: 8min 24sec (504 seconds)

Published: Tue Apr 10 2018