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40 foot contour lines extracted from overall, county-wide 10' contour coverage using NAVD 88 vertical control. Source 10' contours were generated from Digital Terrain Model data which was stereo digitized from aerial photography to industry standards for photogrammetric mapping. Source contours were compiled to meet National Map Accuracy and ASPRS Class I Accuracy standards. Higher accuracy spot elevation points for publication were not included in the project. Contours in obscured areas are only an estimate of approximate ground as interpreted from the aerial photography and may not meet map accuracy standards. Vegetation polygons were not included in the project and obscured area contours of lesser accuracy are not delineated or attributed separately. Obscured areas should be considered to be all areas of dense vegetation or heavy shadow. |