Posted by John McHaleWASHINGTON, 18 May 2010. The National Oceanic and Atmospheric Administration's (NOAA's) National Geodetic Survey -- the official U.S. government source for determining precise latitude, longitude, and elevation -- is undergoing a modernization effort that takes into account advances in GPS and other technologies. A modernized reference system will allow users to easily calculate accurate positions using a survey-grade GPS receiver in conjunction with a scientific model of Earth's gravity field. In 2009, a NOAA commissioned, independent socio-economic study estimated the value of these modernization efforts to be $4.8 billion over the next 15 years, including $2.2 billion in avoidance costs from improved floodplain management.The modernized National Spatial Reference System will take even greater advantage of newer technologies and better track changes in position and elevation over time to improve and update digital maps. The effort is important to all activities requiring accurate positioning information including levee construction projects, the design of evacuation routes in hurricane-prone areas and the forecast of sea-level rise in coastal communities. The proposed changes will affect civilian-federal mapping authorities, as well as state and municipal governments that have adopted the National Spatial Reference System. A Federal Geospatial Summit held at NOAA headquarters in Silver Spring, Md., marked the beginning of a transparent dialogue with users to alleviate concerns and help plan far in advance for these necessary changes to infrastructure and operating methodologies, NOAA officials say. "The reference frame in the past was hampered by being held static in time on an Earth that is constantly changing," says Juliana Blackwell, director of NOAA’s National Geodetic Survey. "The new methodologies better capture changes, such as subsidence or sea level rise, and the improved points of reference benefit everyone using positioning data for the foundation of their work."
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