Saturday, January 17, 2009

USGS topo maps

I've finished the first version of the maps resources Web pages. There are three Web pages, starting at map resources which lists the various maps and sources of maps available on-line and locally, when you visit. In addition you can get USGS maps from their on-line store.

The other two Web pages are for downloading 7 1/2 minute (1:24,000) topographic maps produced by the USGS.

The first are the Digital Raster Graphic (background) image files of the older topographic maps. They're in TIFF files which any photo editor can edit when unzipped.

The second are the Abode PDF image files of the latest topographic maps downloaded from the USGS Map Locator. You can use Adobe Reader or Pro to open and edit the files as well as most photo editor.

The PDF files were created by the USGS with a commercial software package, and when displaying them will produce a popup window about the package. You can simply ignore it. I'm working to produce PDF's without this quirk, but they're embedded in the file.

Please let me know if you have any problems or questions about the Web pages and maps.

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