For a research project I'm working on a sound model. For the sound model I need the breaklines of the landscape. The breaklines describe a change in the behaviour of the surface. I added a picture of an example on where the breaklines are if you create a 3D model of a surface model. However, I'm not able to create the right breaklines in my model. I have arcGIS 10.6, ArcPro and my dear friend Python available as usable software. As input data, I have a LAS dataset, a DEM and a DTM. Any tips / walkthroughs to create the breaklines?

Breaklines example

  • If you have 3D Analyst extension, you can create a profile graph either from a line feature or by drawing a line interactively desktop.arcgis.com/en/arcmap/latest/extensions/3d-analyst/…. If not - I would convert your line feature into a raster, get the elevation values transferred to the line pixels and then use numpy and matplotlib to generate the graph I need. – Alex Tereshenkov Sep 17 '18 at 14:54
  • Sorry, i think you misunderstood. As input data is have a DEM or the LAS point dataset. I want to create the breaklines, which would be a line feature dataset. Drawing it myself would be a no go, since the area is quite large, and I want to use the tool on other projects too. – Simon Veen Sep 17 '18 at 14:57
  • One approach might be to detrend the surface then use the Contour List tool in the Spatial Analyst toolbox to generate contour lines at your elevation breaks. Another approach would be to generate a slope surface from your surface model, reclassify the slope to isolate the areas between your breaks, convert the reclassified surface to lines. – GBG Sep 17 '18 at 15:22
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    A non-ArcGIS way could be GRASS and r.geomorphon (grass.osgeo.org/grass74/manuals/addons/r.geomorphon.html). And then extract valley, ridge, shoulder etc. as vector lines, see: grass.osgeo.org/grass74/manuals/addons/r_geomorphon.png – BERA Sep 17 '18 at 16:17

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