topic Digital Elevation Model issues in ArcGIS Spatial Analyst Questions

Digital Elevation Model issues

MeldebekovaGauhar — Fri, 19 May 2017 02:52:05 GMT

I have a DEM for a river basin in Central Asia from Hydrosheds.com (SRTM 30 arc sec resolution). However my professor says that something is wrong with the model (particularly that cyan color part in the picture below). I am new to GIS and can't figure out how to resolve it. (high elevation parts (brown) are mountains and cyan is steppe/dessert)

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Re: Digital Elevation Model issues

DanPatterson_Retired — Fri, 19 May 2017 03:51:05 GMT

question... are the elevations representative of this area? currently there is no way for others to check.

Also, where is the drainage information for this region?

Re: Digital Elevation Model issues

curtvprice — Mon, 22 May 2017 22:20:22 GMT

From your map there is nothing obviously wrong with the DEM, assuming the steppe area is very flat compared to the mountains (which one would expect).

There are other stretches or classifications you can apply to see more detail in the flat parts of the DEM. Here's some info from the help that may help you display more detail on your map:

Drawing thematic raster datasets representing continuous data—Help | ArcGIS for Desktop

Re: Digital Elevation Model issues

MeldebekovaGauhar — Mon, 29 May 2017 12:49:03 GMT

Thank You for your very helpful input, it worked!:)