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GPS Technology: Survey vs. Mapping Mr. Jeff Clark, PLS -- Precision Products Geospatial Division Mr. Eric Muncy – Precision Products Geospatial Division. 2013 Kentucky GIS Pre-Conference Workshop. Sputnik Launched in 1957 First man made satellite Transmitted radio signals
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GPS Technology: Survey vs. MappingMr. Jeff Clark, PLS -- Precision Products Geospatial DivisionMr. Eric Muncy – Precision Products Geospatial Division 2013 Kentucky GIS Pre-Conference Workshop
Sputnik Launched in 1957 First man made satellite Transmitted radio signals Lived for about 3 months
US Military First used in the 1960s To track nuclear power vehicles - ships
Korean Flight 007 • Shot down September 1983 • Accidently was in Russian Air Space • Presidential Order was signed to make GPS available for civilian use
Selective Availability (SA) • 1989 – Intentional dithering of the satellite clocks by the DOD called SA was instituted in 1989. • 2000 – President Clinton ordered SA to switched off on May 2, 2000. • Had little to no effect on surveying applications of GPS • Greatly improved consumer grade GPS
Consumer Grade Inexpensive 15 to 30 feet accuracy Good for general locations Navigation Street Signs Trees Buildings (911) Consumer or Recreational grade…
Mapping Grade… • Mapping/GIS Grade • 1 inch to 10 feet accuracy • Digital Clipboard • Good for more accurate locations • Hydrants • Manholes • Roads
Survey Grade • Centimeters accurate • Most robust • Good for the accurate locations related to: • Control networks • Land boundaries • Topographic & Engineering Surveys
What is the freaking difference?? Survey vs. Mapping
Mapping - Software • Collection of Attributes/Photos • Taking GIS data out with you
Survey - Software • Stakeout operations • Volumetric calculations • Coordinate Geometry • Metadata - Datums, NAD 83, Geoids
KYTC VRS - Basics • VRS – Virtual Reference Station • Free Service (Anyone to use) • Can be used in real time (Cell phone / Cell modem) or back in the office to process GPS data • Continuing to be improved (location and accuracy) • http://kycors.ky.gov/
KYTC VRS – Basics THEN
Questions? • Contact Info: Mr. Jeff Clark, PLS Cell: 270-559-9097 Email: jeff_clark@yourprecision.com Mr. Eric Muncy Cell: 859-321-3675 Email: eric_muncy@yourprecision.com