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117
votes
11answers
24k views
2
votes
1answer
41 views

General terms for the Esri-terms “Layer” and “Feature Class”

I'm familiar with these terms used by ESRI: Layer Stores visual properties (color, symbols,…) does not store data (attributes, coordinates) links to a Feature Class (or raster data) Feature Class ...
8
votes
1answer
128 views

Is “puntal” an accepted and defined geometric term?

There are definitions for the geometric qualities of polygons and lines: polygonal: Having many angles; hence characteristic of a polygon. Ref: http://en.wiktionary.org/wiki/polygonal ...
9
votes
7answers
862 views

Best definition for GIS today?

What is the best definition of Geographical Information Systems? Has the definition changed at all since I was taught it 10yrs back? The technology has changed a lot and it is more powerful than it ...
36
votes
7answers
28k 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 ...
7
votes
4answers
3k views

How do you explain what a .lyr file 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 ...
3
votes
0answers
65 views

What is a shaved polygon?

Just trying to find a definition. I was asked this in an interview and I assumed it was a polygon created by incorrectly modifying a another polygon in a coverage. According to my best googling ...
12
votes
4answers
455 views

When should I be calling a 'rectangular grid of pixels' a raster or an image?

Reading through GIS literature, it sometimes feels that authors use the two terms with a specific meaning in mind. I always treat the terms interchangeably. Am I wrong? Read the first line in the ...
22
votes
14answers
5k 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 ...
5
votes
1answer
317 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 ...
11
votes
4answers
356 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, ...
10
votes
3answers
2k views

Define “geospatial data” for a non-GIS professional

I realize this is a sort of a subjective question, but I've seen other subjective questions on the site, so I thought it I'd put it out there. A colleague recently had a request for "geospatial data" ...