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Results tagged with terminology
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user 664
Indicates questions asking about the use and meaning of specific technical words in GIS.
3
votes
Accepted
Proper name for area defined by coordinate pair and radius
"Circle" is overloaded and therefore ambiguous. Most often, this term refers to a circular boundary: a one-dimensional object. Mathematicians--who need to make careful distinctions like this--typicall …
- 70.2k
3
votes
Accepted
Correct use of the terms geographic, path, and Euclidean distance
Summary
In the following reply, "geographic", "Euclidean", "path", and "cost" distances are defined and distinguished. Connections with the Calculus of Variations are made to show how general and pow …
- 70.2k
22
votes
Accepted
What is layer file (*.lyr) in ArcGIS Desktop?
Geographic data tell you how to paint by numbers:
A layer file tells what colors (etc.) go with the numbers:
When both are available, the GIS puts them together into a map:
- 70.2k
41
votes
Accepted
Why do we use the terms “longitude” and “latitude” for a spherical body?
The terms are medieval:
latitude (n.) late 14c., "breadth," from Old French latitude (13c.) and directly from Latin latitudo "breadth, width, extent, size," from latus "wide," ... . Geographical …
- 70.2k
118
votes
Difference between projection and datum
After struggling with this question ten years ago, and finding many confusing things written about the topic, I published a brief article in Directions Magazine that presented an answer as simply, pla …
- 70.2k