Data sources?


Does anybody know where much of this data comes from?

It says that many of these files are updated once or twice a year from "an outside source." Some have tens or hundreds of thousands of points, what outside source / company is doing all this work?


We've compiled a lot of data in the larger files from government agencies. There are good GIS resources at all levels -- Federal, state and local.

The "fun" part is stiching it together and formatting it to work with GPS. smile