[sf-lug] geoprocessing help [Re: sf-lug Digest, Vol 42, Issue 10]

[John Reilly]

John Reilly wrote:
> A good place to start looking for geospatial data is the USGS and 
> various agencies that use spatial data.
Another thing that I probably should have mentioned is that you should 
probably look for WGS-84 based data, although I'd guess that most 
lat/long data out there is WGS-84.  That is the lat/long co-ordinate 
system used by GPS.  Believe it or not, there are several lat/long 
systems and the same point on earth may have a different lat/long 
depending on the co-ordinate system used.  More info at 
http://en.wikipedia.org/wiki/World_Geodetic_System

Cheers,
John