This image is a DEM ( Digital Elevation Model) of the Sacramento Valley located in nothern California. A DEM is a digital representation of ground surface topography and are usually obtained by remote sensing than direct survey. This map has a color coordinated chart that shows the ranges in elevation for its various geographic features in meters.
This Image was taken from: http://images.google.com/imgres?imgurl=http://www.emporia.edu/earthsci/student/alvarez1/svdem.jpg&imgrefurl=http://www.emporia.edu/earthsci/student/alvarez1/551proj.html&usg=__zU4CgN1HtOSnfArHupBJjnm23fM=&h=723&w=671&sz=184&hl=en&start=15&itbs=1&tbnid=J7T6FIXT9fusiM:&tbnh=140&tbnw=130&prev=/images%3Fq%3DDem%2Bmap%26hl%3Den%26sa%3DG%26gbv%3D2%26tbs%3Disch:1
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