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129
votes
11answers
32k views
37
votes
7answers
40k views

What is the difference between DEM, DSM and DTM?

I am listing some of the acronyms used in our work and had to stop to think about whether to list these together or separately. In some circles they are synonymous, in others they have distinct ...
22
votes
14answers
8k views

How do you explain what GIS is?

Whenever I do a presentation about anything related to GIS, I consider the level of knowledge of GIS of the audience. The worst times are definitely when I need to explain GIS to a group that has ...
11
votes
4answers
382 views

Define the “system” in Geographic Information System

When speaking or writing about GIS all too often the concept in peoples' minds for Geographic Information Systems can be rephrased as "the software for map data". While software is integral to GIS, ...
9
votes
4answers
5k views

How to explain what layer file (*.lyr) in ArcGIS Desktop is?

My organization uses *.lyr files consistently as a means for our users to view the data and build their mxds. It works great for our purposes, but we have run into an issue where we don't think the ...
5
votes
1answer
399 views

How many kinds of “address” are there? [closed]

I'm defining "address" as "a physical location, usually visibly numbered". Numbered was used in the definition to exclude purely geographical features not usually considered to have or need an ...