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Developer
Posts: 1,415
Registered: ‎07-30-2008
My Device: Not Specified

US GPS location references- not BB specific but requested by a few

The census and usgs pages are terribly out of date with lots of dead links. However, they are not

out of data, in fact quite the opposite. To get started, if you need some refernce points you can

download some of these data files:

 

http://geonames.usgs.gov/domestic/download_data.htm

 

READ THE NOTES- not all lat/long/alt coords are equal and errors apparently can be 100m range.

 

I'm extracting useful features in a more concise file and will post if there is any interest.

I wouldn't give up on US census Tiger datafiles, on the census ftp site but I'm not sure how to relate

all of their features to lattitude/longitude yet.

 

 

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Developer
Posts: 1,415
Registered: ‎07-30-2008
My Device: Not Specified

Re: US GPS location references- not BB specific but requested by a few

If people are developing BB apps and want to populate with some real skeletons, this turns out to be

a nice dataset. I offer this link just for testing and advertising ( if you have some ideas please contact me),

and make no assurance it will be up for any particular time but it does illustrate how quickly you can get reference

points,

 


 http://www.spottext.com/launcher/db/loc.cfm?action=find&longitude=-122.46277&latitude=37.5375&class=...

Right now this only has points for states roughly beginning with A-M ( I'm uploading in between other things), but the story is outlined here,

 

http://www.spottext.com/marchywka/gps_docs.html

 

In the first link, you can choose location classes from the table at the bottom of the page or omit altogether. dima and dimo are the tolerable

distances in DEGRESS from reference point.