Tagged Questions

The vertical and horizontal dimension of land surface

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14
votes
7answers
3k views

Are there open access terrain tiles with a permissive license like OSM?

Are there open access terrain pyramidal map tiles with a permissive usage license like OpenStreetMap's? I'm building aviation-related maps with Polymaps and need a good raster basemap. The Google ...
7
votes
7answers
12k views

How can I create profile cross-sections in ArcGIS 10?

Because the default 'Profile Graph' tool was not sufficient, I wrote a custom VBA script that creates scaled and exaggerated profile cross-sections in ArcGIS but I need more features: Visualize more ...
3
votes
4answers
2k views

Can I convert ESRI Grid (DEM) raster to USGS DEM?

There is a tool for DEM to Raster in ArcGIS but I need to convert my ArcGIS DEM rasters (mostly LiDAR) into USGS DEM. The idea is to import this DEM into Sketchup and create a "sandbox" TIN surface ...
3
votes
6answers
1k views

shadow simulation from buildings

is it possible to use hillshade function in ArcMap to calculate shadow areas of buildings or simulate shadows of buildings, using DSM of the buildings and the sun angle and azimuth?
7
votes
7answers
606 views

seeking “Available Sky” implementations

I'm looking for implementations of an algorithm called "Available Sky". ArcGIS (Spatial Analyst or GRID) is preferred, but solutions in GDAL, SAGA GIS or others are perfectly acceptable. The ...
0
votes
1answer
246 views

Calculate CTI TWI using raster calculator: Negative values

I am calculating Topographic Wetness Index for a study area using SRTM DEM (90 and 30m). I understand there are many "flavors" of TWI (CTI). I have been using: TWI = ln(As +1 / tanB) where As ...