mandag den 24. november 2008

U.S. National Grid Simplifies Mapping


I Danmark har vi også kvadratnettet (http://www.dst.dk/HomeDK/TilSalg/doga/emner/Kvadrat.aspx) som herhjemme kobles til en masse statistiske data og hermed visualiserer en h....... masse information hurtigt og overskueligt. For mig at se er det her at GIS for alvor viser sit sande ansigt.
/Sik


In Denmark we have something called the 'square mesh'. Down to 100 by 100 meter the whole of Denmark is chopped into slices and is usually used for displaying tons of statistical data. To me this is one of the moments where you'll see the true spirit of GIS.
/Sik




Quote

Half a century later, the civilian sector began to grapple with the issue of map grids for location reporting. With the rapid growth of GPS technology in the 1990s, anyone could use a handheld GPS receiver to quickly determine precise geographic positions. GPS soon became essential for emergency response, disaster relief, and search-and-rescue operations.

Unfortunately, this advance remained hampered by the geographic coordinate system and other inadequate position referencing systems. Street addresses offered only limited accuracy and range, and locally produced map grids each followed their own standards and definitions. The need for a standardized rectangular grid reference system for civilian use became obvious.

Recognizing this need, leading members of the U.S. mapping sciences community formed the Public XY Mapping Project in 1997. Representatives of the National Imagery and Mapping Agency, which would become NGA, soon became involved in the project. After considering several possibilities, the project committee concluded that a UTM-based, slightly modified version of MGRS would be the best choice for a standardized, national map grid for civilian use. In 2001, the U.S. National Grid became a standard for the interagency Federal Geographic Data Committee (FGDC), which was established in 1990 to coordinate geospatial data nationally. USNG is the preferred grid for applications of the National Spatial Data Infrastructure, the FGDC's data publishing effort. [...]


Read more: http://www.directionsmag.com/article.php?article_id=2940&trv=1

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