Tagged Questions

The measure of separation between two entities or locations that may or may not be connected, such as two points.

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5
votes
5answers
606 views

Getting a square mile bounding box anchored by coordinates?

Let's say I have a lat/lng coordinate pair. I want to determine the coordinates that would create a square mile box. The existing coordintae pair would be the top left of the box, and the coordinate ...
11
votes
3answers
3k views

Algorithm to find nearest point

I've a list of a few hundred cities with their latitude/longitude. Given another location (also in lat/long) I need to find the nearest city. As I don't use any GIS, by now the obvious algorithm is ...
10
votes
2answers
809 views

Surface distance on DEM between two coordinates

Given two coordinates on a digital elevation model (DEM), how do I compute the actual distance traveled between the two locations, assuming a straight line route? How will changing the resolution of ...
3
votes
2answers
233 views

Test case for geo-distance implementation?

I wrote a method, based on this presentation, that filters points based on their proximity to a target point. I would like to write a few test case. What would be good test cases for this method? // ...
8
votes
4answers
2k views

How to find the minimum edge to edge distance of polygons?

I have a a map of about 3000 polygons in ArcGIS 10. I'm looking to find the distance between each one of them. I know how to do it using the lat and long coordinates of the centroid, but I'm looking ...
2
votes
1answer
2k views

How to calculate distance between two locations using stored procedure in MySQL?

I have a database with locations with its lat and long coordinates. The area of locations is quite small with lots of them quite near each other. Im using this stored procedure in my project. ...
2
votes
1answer
546 views

How is distance between zip codes calculated?

Specifically, where can I find a database of zip codes, their lat/lon centers, and intervening "obstacles" (for example, zip codes that are geographically close but separated by the Chesapeake Bay).

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