topic generating a DEM from LAS files in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/generating-a-dem-from-las-files/m-p/251746#M3589 <HTML><HEAD></HEAD><BODY><P>Hi all. I'm trying to generate a bare earth DEM from LAS files for use with Arc Hydro (to delineate flow paths). I've done this successfully one time by: creating an LAS dataset, filtering out all but the ground-only points in the LAS dataset, and converting the LAS dataset to a raster with Triangulation (Natural Neighbor/No Thinning) and a cell size of 1ft.</P><P></P><P>Like I said, this has already worked once. When I ran it through Arc Hydro, it defined some beautiful stream lines. This time, it is producing really wonky lines. There are these huge horizontal cuts where the streams conflate. I think this means that Arc Hydro is interpreting these as big flat areas, but I don't know how or why.</P><P></P><P>P.S. I already tried to post this question with images, but it didn't get approved. So now I'm afraid to include images. Sorry!</P></BODY></HTML> Mon, 30 Sep 2019 13:08:08 GMT EllenFehrs 2019-09-30T13:08:08Z generating a DEM from LAS files https://community.esri.com/t5/arcgis-spatial-analyst-questions/generating-a-dem-from-las-files/m-p/251746#M3589 <HTML><HEAD></HEAD><BODY><P>Hi all. I'm trying to generate a bare earth DEM from LAS files for use with Arc Hydro (to delineate flow paths). I've done this successfully one time by: creating an LAS dataset, filtering out all but the ground-only points in the LAS dataset, and converting the LAS dataset to a raster with Triangulation (Natural Neighbor/No Thinning) and a cell size of 1ft.</P><P></P><P>Like I said, this has already worked once. When I ran it through Arc Hydro, it defined some beautiful stream lines. This time, it is producing really wonky lines. There are these huge horizontal cuts where the streams conflate. I think this means that Arc Hydro is interpreting these as big flat areas, but I don't know how or why.</P><P></P><P>P.S. I already tried to post this question with images, but it didn't get approved. So now I'm afraid to include images. Sorry!</P></BODY></HTML> Mon, 30 Sep 2019 13:08:08 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/generating-a-dem-from-las-files/m-p/251746#M3589 EllenFehrs 2019-09-30T13:08:08Z