2013 Kentucky GIS Pre-Conference Workshop GPS Technology: Survey vs. Mapping Mr. Jeff Clark, PLS -- Precision Products Geospatial Division Mr. Eric Muncy – Precision Products Geospatial Division

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  2000 – President Clinton ordered SA to switched off on May 2,  Had little to no effect on surveying applications of GPS  Greatly improved consumer grade GPS

BASE STATION

Different Grades of GPS?

Consumer or Recreational grade…  Consumer Grade  Inexpensive  15 to 30 feet accuracy  Good for general locations  Navigation  Street Signs  Trees  Buildings (911)

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

 Collection of Attributes/Photos  Taking GIS data out with you Mapping - Software

 Stakeout operations  Volumetric calculations  Coordinate Geometry  Metadata - Datums, NAD 83, Geoids Survey - Software

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) KYTC VRS - Basics

KYTC VRS – Basics THEN

KYTC VRS – Basics NOW

 Questions?  Contact Info: Mr. Jeff Clark, PLS Cell: Mr. Eric Muncy Cell: