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Global Positioning System. Primary purposes: navigation, projectile guidance, search and rescue, surveying, communications, recreation. Global Positioning System.

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Global Positioning System

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Global Positioning System

Primary purposes: navigation, projectile guidance, search and rescue, surveying, communications, recreation


Global Positioning System

  • The GPS Master Control Station, operated by the 50th Space Wing's 2nd Space Operations Squadron at Schriever AFB is responsible for monitoring and controlling the GPS satellite constellation.


THE WHITE HOUSEOffice of the Press SecretaryFor Immediate Release May 1, 2000

STATEMENT BY THE PRESIDENT REGARDING THE UNITED STATES' DECISION TO STOP DEGRADING GLOBAL POSITIONING SYSTEM ACCURACY

Bill: Today, I am pleased to announce that the United States will stop the intentional degradation of the Global Positioning System (GPS) signals available to the public beginning at midnight tonight. We call this degradation feature Selective Availability (SA). This will mean that civilian users of GPS will be able to pinpoint locations up to ten times more accurately than they do now.


Q: What happened?

A: Selective Availability was removed

MAY 1, 2000 MAY 3, 2000


Global Positioning System

  • What’s next: longer life expectancy and higher accuracy

    • GPS Block IIF – 2 of 12 launched (last in Aug., 2011)

    • GPS Block III (under development)

    • Much more here: http://www.gps.gov/


GPS to Google Earth


GPS to Google Earth


GPS to Google Earth


GPS to Google Earth

This is why you average waypoints


LightDetectionAndRanging

  • LiDAR – air and ground based

    • 30 year old technology

    • Cost effective only recently

  • System components

    • Laser scanner with a precise clock

    • Requires robust computer support


LightDetectionAndRanging

Airborne scanning

30,000 points per second at ~15 cm accuracy

$400–$1000/mi2


LightDetectionAndRanging

How do multiple-

returns work?


10 meter ???


3 meter LiDAR point data


Picture: Oblique view of S end Rockaway Beach


with buildings

Univ. of Wisconsin


without buildings

Univ. of Wisconsin


High-resolution topography: some applications

  • Fault mapping

  • Geologic mapping

  • Landslide hazards & change thru time

  • Flood hazards

  • Surface water runoff modeling

  • Precision forestry

  • Noise propagation (roughness)


landslides

southern Bainbridge Island


15 km west of Seattle

Toe Jam Hill

fault scarp

Waterman Point

scarp

beach uplifted

during 900 AD

earthquake


terrestrial LiDAR scanners


http://soundwaves.usgs.gov/2007/06/pubs.html


http://www.cg.tuwien.ac.at/research/projects/LEOPOLD/Images/scanning_02.jpg


Original scan by CerianGibbes, Brandon Vogt, and Steve Jennings


Original scan by CerianGibbes, Brandon Vogt, and Steve Jennings


Original scan by CerianGibbes, Brandon Vogt, and Steve Jennings


Terrestrial Laser Scanning

  • UCCS (Leica-Geosystems ‘TruView’)

    • http://www.uccs.edu/~bvogt/truview/

  • Allerton Church

    • http://www.youtube.com/user/stevepopely#p/u/3/ahwqCl5Z9oU


GPS / LiDAR background

  • GPS

    • http://www.youtube.com/user/airforcespacecommand#p/u/5/_zM79vSnD2M

  • Lidar

    • http://video.google.com/videoplay?docid=2891533736664888395#


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