#Creating #cross #sections with a #DEM #GIS

Creating #CrossSections with #DEMs is a fun way to review the the change in vertical elevation with respect to distance.

In this video we defined a line segment and produced a profile graph using ArcMap 10.  This is an awesome way to do preliminary ground truthing.

To do this video, we attained the DEM from GeoBase and clipped it using a Toronto Regional Boundary from the Toronto Open Data.  We applied segments along channel cross sections.

After posting this video on cross sections, we had amazing questions from viewers on how to expand the usability of this output.

Like +NachoValdes7 who asked an excellent question on calculation the area of the cross section.  The difficulty with this tool is that while you can customize the axis and titles, the output is graphical.  Unfortunately this tool leaves most users with the difficult task of gridding the output and counting the cells then multiplying the number of cells with the true dimension.

i.e. each cell is 100m x 100m.  You have 30 cells
Area = 30 x (100m x 100m) = ____m2

Another fun question was from +Diarmuid Duggan who asked if you could define those line segments used to derive the cross sections using an existing polyline.  So that was a very fun and out-of-the-box question.  Here’s that video (part 1, 2 and 3).

As always, there’s multiple ways to arrive to the same solution.  If you have a solution that’s equivocally interesting, feel free to screen capture it on YouTube and share. 🙂

Did you find what you were looking for?  Feel free to share your appreciation in the comments of this blog, on Google+ (teachugis) or on Twitter (www.twitter.com/teachugis).  As always, thanks for watching. 🙂

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