GIS-46: PHOTOGRAMMETRY - GPS

Order No:

GIS-46

Total Length:

106 minutes



VISAT: A Real-Time System for Highway Spatial Information Acquisition

Reference No:

GIS 46-1

Automation of GIS data acquisition is a very important issue in terms of time, budget and feasibility in cases where field surveys have to be performed. This paper describes a real-time system for highway information acquisition - VISAT, which integrates GPS/INS techniques with digital photogrammetry. With navigational data provided by the GPS/INS, two-dimensional GIS databases elements are extracted from these images using a soft-copy photogrammetry system. This technique provides a rapid and accurate means of building geometric entities. It has been implemented in a window environment on a UNIX workstation. Applications of this technique can be found in real time mapping, highway spatial information systems, the real estate sector and others.

Lecturer:

  • R. Li, Dept. of Geomatics Engineering, University of Calgary, Canada

Suitability for
Level of
Instruction:

  • University (Undergraduate)
  • Advanced Research
  • Professional

Duration:

19 minutes

Year of
Presentation:

1992

Suggested
Presentations:

GIS-27, GIS-36, GIS-39

 

Exploration of and Procedure Development for Fast Static GPS Techniques

Reference No:

GIS 46-2

The project was undertaken to determine the utility of fast static techniques in field control procedures. The fast static GPS technique uses an enhanced set of processing algorithms to provide for carrier phase ambiguity resolution with reasonable short data sets. The presentation discusses results of testing the technique in terms of its position accuracy as related to baseline lengths, period of occupation, number of satellites and satellite geometry.

Lecturer:

  • Timothy W. Saultz, U.S. Geological Survey

Suitability for
Level of
Instruction:

  • University (Undergraduate)
  • Advanced Research
  • Professional

Duration:

17 minutes

Year of
Presentation:

1992

Suggested
Presentations:

GIS-41-1

 

Mapping Applications of the Global Positioning System on Airborne Platforms

Reference No:

GIS 46-3

An essential status report on USGS investigation of airborne GPS technology; including goals, accuracy requirements of products, specifications for acquisition of GPS positions on camera exposure stations, ongoing projects, operational issues facing USGS, and plans for the future.

Lecturer:

  • Kari Craun, U.S. Geological Survey
  • Larry Hodum, U.S. Geological Survey

Suitability for
Level of
Instruction:

  • University (Undergraduate)
  • Advanced Research
  • Professional

Duration:

27 minutes

Year of
Presentation:

1992

Suggested
Presentations:

GIS-39

Airborne GPS Photogrammetry for Transportation Systems

Reference No:

GIS 46-4

Application of airborne-GPS photogrammetric methods to control surveys for transportation systems is discussed. Typical transportation photography is flown in strips rather than blocks; as a consequence, control provided by airborne-GPS tends to reside on a common spatial line. This in turn generates an ill-conditioned if not singular system of normal equations for bundle block adjustment computation. Solutions to this problem are proposed and demonstrated. Accuracies of better than one part in 20,000 of the flight height are reported when only one ground control point is used.

Lecturer:

  • Dean C. Merchant, Topo Photo, Inc., Columbus, OH

Suitability for
Level of
Instruction:

  • University (Undergraduate)
  • Advanced Research
  • Professional

Duration:

13 minutes

Year of
Presentation:

1992

Suggested
Presentations:

GIS-39,

 

GPS Controlled Aerial Triangulation of Single Flight Lines

Reference No:

GIS 46-5

Aerial triangulation controlled by GPS observations in the aircraft has been established as a precise method of photogrammetric point determination without the need of ground control. New developments in kinematic GPS processing yield accurate exposure locations instantaneously. This paper investigates GPS-controlled strip triangulation, using known, linear features on the ground that are approximately parallel to the flight line. Experiments using simulated and real data are presented as well as the effects of different GPS measurement accuracies both in the air and on the ground. It is demonstrated that this new technique is useful for mapping railroads. The results of these tests verify the practical feasibility of GPS-controlled strip triangulation with known linear objects on the ground.

Lecturer:

  • Ayman Habib, Dept. of Geodetic Science & Surveying, Ohio State University, Columbus, OH

Suitability for
Level of
Instruction:

  • University (Undergraduate)
  • Advanced Research
  • Professional

Duration:

22 minutes

Year of
Presentation:

1992

Suggested
Presentations:

GIS-39

 

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