WHAT BENCH MARK INFORMATION SHOULD BE USED IN THE IMPACTED AREAS?
Bench mark information for the rebuild should be obtained from National Geodetic Survey. Updated bench mark elevation information is now available for coastal Louisiana, areas south of Interstate 10. This information should be incorporated into all recent, current, or planned surveying efforts in this region which are elevation sensitive. Contact National Geodetic Survey and the Louisiana Spatial Reference Center for updated or additional information on bench mark elevations and additional Global Positioning System sites in coastal Louisiana for the area south of Interstate 10. National Geodetic Survey has validated the heights of 85 existing bench marks using Global Positioning System, subsidence rates, and an improved geoid model. The data sheets for these Vertical Time-dependent positioning stations have been updated. Furthermore, these stations will be included in the re-adjustment of the National Spatial Reference System to be released in February 2007.
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- WHAT BENCH MARK INFORMATION SHOULD BE USED IN THE IMPACTED AREAS?
