Definition Edit

Selective availability (S/A) was

the intentional degradation of the performance capabilities of satellite systems, such as GPS, for civilian users by the U.S. military, accomplished by artificially creating a significant clock error in the satellites.[1]

Overview Edit

"Selective availability (S/A) was removed from the civilian signal in May 2000. Since the lifting of S/A restrictions, position accuracy levels have improved to 20 meters or less."[2]}}

References Edit

  1. EPA, Locational Data Policy Implementation Guidance: Guide To Selecting Latitude/Longitude Collection Methods 3-1 (Mar. 1992) (full-text).
  2., GIS Glossary (full-text).

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