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89
votes
8answers
16k views
What's the difference between a projection and a datum?
What's the difference between a projection and a datum?
26
votes
7answers
16k 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 ...
11
votes
4answers
335 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, ...
5
votes
1answer
266 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 ...
