California DRGs

There are multiple series of DRGs for different scales. The 1×2 degree series are at a scale of 1:250K. The 30×60 minute series are at a scale of 1:100K, and the 7.5 minute series are at 1:24K. Additionally, there are some 1:25K scale maps that are included in this distribution as belonging to the 7.5 minute series (experimental site)

http://gis.ca.gov/DRG.epl

http://drg.casil.ucdavis.edu/

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