Description: This data set is derived from USGS ten-meter DEMs processed to identify cells with aspect, slope, and elevation values meeting certain criteria and falling within specific viticultural areas. These criteria and specifications are given in Oregon Ballot Measure 49, Section 2.10.e and Section 2.10.f. The viticultural area bounds are based on the definitions given in the Code of Federal Regulations, Title 27, Volume, Part 9: American Viticultural Areas, specifically: 9.74 Columbia Valley, 9.89 Umpqua Valley, 9.90 Willamette Valley, 9.91 Walla Walla Valley, 9.132 Rogue Valley, 9.178 Columbia Gorge, 9.179 Southern Oregon, and 9.208 Snake River Valley.