County Lookup on Latitude, Longitude

[dhulting]

Is there a way to get the county of a latitude, longitude pair?

tia

[-Oz-]

For what purpose, a web program or what?

The map i made the one above started out as polygons so I can easily pass that to you if that would help.

[dhulting]

That would be awesome! I have sales people listed by counties, and I'm trying to pair them up with geocoded locations of prospects (lat/lon). County data is tough to extract. The polygon solution sounds promising.

[maps4gps]

If you do not have to many, Global Mapper will let you load up to 4 files (for free).  Open a State's county polygon file from Census and your coords as a .gps, csv or ascii file and match one at a time.  With a GIS program($$$$) the match could probably be done automatically.

[-Oz-]

county shapefiles (polygon): http://www.gpsfiledepot.com/uscounties.zip let me know once you've downloaded it so I can clear up the space...

[leszekp]

One way you could handle this is to convert the geocoded coordinate pairs to a point shapefile with the free GIS MapWindow:

http://freegeographytools.com/2007/a-free-and-easy-shapefile-coordinate-converter

Then use the county polygon shapefile, the coordinate point shapefile, and MapWindow's Identity of Shapes With Polygon function to determine which county each point lay in:

http://freegeographytools.com/2009/assigning-attributes-from-a-polygon-shapefile-to-another-shapefile

[Indrid Cold]

One way you could handle this is to convert the geocoded coordinate pairs to a point shapefile with the free GIS MapWindow:

http://freegeographytools.com/2007/a-free-and-easy-shapefile-coordinate-converter

Then use the county polygon shapefile, the coordinate point shapefile, and MapWindow's Identity of Shapes With Polygon function to determine which county each point lay in:

http://freegeographytools.com/2009/assigning-attributes-from-a-polygon-shapefile-to-another-shapefile

Even better!

[dhulting]

Thanks a mil for the solutions! When I can get back to thisproject, I'll take these for a spin.