Oakland, CA, November 14, 2005 – HJW GeoSpatial (HJW), Inc., has been awarded a contract to produce a LiDAR digital terrain model and color orthophotos for the County of San Mateo, CA. The project is being funded by the County of San Mateo, the U.S. Geological Survey, the San Mateo County Transit District and the City/County Association of Governments of San Mateo County.
LiDAR data will be acquired for the entire county, and used to generate a digital terrain model to support orthophoto production. HJW will classify and filter the LiDAR data in order to achieve a bare-Earth terrain model, which will be accurate enough to generate 2’ contours. In addition to using automated LiDAR classification procedures, HJW will employ photogrammetric methods to ensure accurate point classification. Orthophotography as well as stereo-model analysis will be used to support HJW’s quality control procedures.
HJW will acquire roughly 500 square miles of color photography at two photo scales for the production of orthophotos with pixel sizes of ¼’ and ½’. The orthophotography will meet National Map Accuracy Standards for 1”=100’ and 1”=200’ mapping. The orthophotography will be mosaicked and delivered in a pre-defined tiling scheme.
Prior to this project, in 2004, HJW produced 1”= 100’ color orthophotos for the City of San Mateo, and in 1997, HJW produced orthophotography for the entire County.
About HJW GeoSpatial, Inc.
Headquartered in Oakland, CA, HJW GeoSpatial has provided aerial mapping services to government agencies and private clients since 1949. Their professional services include LiDAR terrain modeling with an emphasis on photogrammetric quality control, aerial photography, topographic and planimetric mapping, orthophoto production, GIS integration, and satellite remote sensing services.
Pacific Aerial Surveys (PAS), a division of HJW GeoSpatial, is located in their Oakland office. The PAS photo library makes historic and recent aerial photographs, digital orthophotos, maps and satellite imagery available to the public for environmental, legal, real estate, and facility planning applications. PAS also offers federally-qualified imagery interpretation services as well as expert witness testimony on image interpretation matters.
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