Description: Topographic information for Cowlitz County has been derived from a combination of private contracts with aerial mapping firms, and from federal and state sources. Topographic data products available in Cowlitz County were processed from: 1. Ortho photography flown in 1995, and 1996 that produced raw DTM , and finished contour lines (in selected areas) based on three different map scales 2. Ortho photography flown by the Army Corps of Engineers in 1996 and acquired by Cowlitz County as part of a partnership agreement that produced raw DTM and finished contours and 3. DEM data, acquired from the State of Washington processed in 1997 that is a digital representation to the published USGS 7.5 minute quads contours.
Description: Topographic information for Cowlitz County has been derived from a combination of private contracts with aerial mapping firms, and from federal and state sources. Topographic data products available in Cowlitz County were processed from: 1. Ortho photography flown in 1995, and 1996 that produced raw DTM , and finished contour lines (in selected areas) based on three different map scales 2. Ortho photography flown by the Army Corps of Engineers in 1996 and acquired by Cowlitz County as part of a partnership agreement that produced raw DTM and finished contours and 3. DEM data, acquired from the State of Washington processed in 1997 that is a digital representation to the published USGS 7.5 minute quads contours.
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