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Results tagged with dem
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user 52574
For questions about Digital Elevation Models (DEM), Digital Terrain Models (DTM) and Digital Surface Models (DSM)
3
votes
Identifying and Placing Points on DEM Features using ArcGIS Desktop?
Lots of ways to try to get at this:
Topographic Position Index http://www.jennessent.com/downloads/tpi-poster-tnc_18x22.pdf
Elevation residuals (DEM minus a smoothed version of DEM)
Local maxima (Focal … In ArcMap, assuming you have access to the Spatial Analyst extension, use the Raster Calculator tool and enter: "DEM" - FocalStatistics("DEM", NbrCircle(5, "MAP"), "MEAN", "DATA"). …
- 1,302
2
votes
Is D8 flow accumulation algorithm still suitable for watershed computation if terrain contai...
as referenced in your initial statement, which precludes the use of divergent flow
For overland flow direction in general however, a multiple-flow direction algorithm is generally more forgiving of DEM …
- 1,302
1
vote
Create convex hull over DEM
I don't recommend the approach you've outlined. As an example based on the simple profile you've provided, the "hydrology toolset" approach would require a "fill" operation to remove all depressions ( …
- 1,302
2
votes
Accepted
Options for generalizing raster?
If you’re using ArcGIS with the Spatial Analyst extension, you could simply use the Resample tool. Or use Block Statistics. Both would provide rapid aggregation of cells, but using different methodolo …
- 1,302
1
vote
Accepted
Burning an open channel in DEM
If you've already rasterized your channel depths, try simply running a minimum function (or a Conditional statement) to merge them together properly:
Con(ChannelRas < DEM, ChannelRas, DEM) …
- 1,302
2
votes
Understanding hydrology and DEM results?
There are alternatives to this that either apply a downstream trend to the filled surface (helps a bit) or better yet, you could decrement (breach) the DEM instead of filling to preserve the inherent topography …
- 1,302
3
votes
Which .las classification codes and returns to use when creating DTM and DSM?
Generally, assuming your data classification conforms to the ASPRS LAS Classification guidelines, you'll use class 2 for ground as a bare earth DTM and first returns for a full feature DSM. There are …
- 1,302
3
votes
Accepted
Correcting merged LiDAR DEM with outliers in inner edges?
If you’re using FUSION, you might have to look at the LTKProcessor to retile your data to include buffer overlap. See Appendix C of the FUSION manual http://forsys.cfr.washington.edu/fusion/FUSION_man …
- 1,302