10-14-2008 10:13 AM
The census and usgs pages are terribly out of date with lots of dead links.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:
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.
10-16-2008 12:07 PM
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
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,
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.