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The clash starts from USGS/Esri are using Bare Earth as DSM and Digital Elevation Model http://pubs.usgs.gov/tm/11b4/pdf/tm11-B4.pdf while our UK counter parts are using Digital Surface Model (DSM) or Digital Terrain Model (DTM) Now for those with time or want to see London / UK from a different view... http://environment.data.gov.uk/ds/survey#/ - just be ...
If this is the list and there aren't any other categories, I'd have no doubt and put it in IT & Software. I think you cannot confuse what GIS is and what do you use it for.
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