Title page for ETD etd-05162005-203359


Type of Document Master's Thesis
Author Germroth, Matthew Ryan
URN etd-05162005-203359
Title GIS and Satellite Visibility: Viewsheds from Space
Degree Master of Science
Department Geography
Advisory Committee
Advisor Name Title
Carstensen, Laurence William Jr. Committee Chair
Bostian, Charles W. Committee Member
Hall, Christopher D. Committee Member
Keywords
  • viewshed
  • satellite
  • urban canyon
  • visibility
  • hillshade
  • GIS
  • GPS
Date of Defense 2005-04-28
Availability restricted
Abstract
The Global Positioning System (GPS) has recently become the significant mapping tool for millions of customers worldwide, providing its users with accurate terrestrial positions almost instantaneously. The functionality of a GPS receiver depends on the number of satellites to which it can establish an unobstructed line of sight. Current satellite availability prediction tools perform satellite visibility predictions without considering terrain or structures that block GPS signals, a major issue in mountainous and urban areas. This paper describes a new Geographic Information Systems (GIS) tool, a customization of ArcGIS named Satellite Viewsheds, which predicts satellite visibility for any place and time while considering line of sight obstructions. Satellite Viewsheds requires a raster surface model, the test date and time, and the orbital properties of the satellites. It produces grids depicting the number of visible satellites and optimal viewing time for every cell in the grid. Satellite Viewsheds allows users to avoid areas of signal loss and choose the best time to map using their GPS receivers. The field test of Satellite Viewsheds proved that the tool performs satellite visibility predictions consistently and accurately. The research outlined in this paper indicates that Satellite Viewsheds is the first tool of its kind.
Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
[VT] Germroth_Back_Matter.pdf 126.09 Kb 00:00:35 00:00:18 00:00:15 00:00:07 < 00:00:01
[VT] Germroth_Body_Matter.pdf 2.19 Mb 00:10:07 00:05:12 00:04:33 00:02:16 00:00:11
[VT] Germroth_Front_Matter.pdf 100.31 Kb 00:00:27 00:00:14 00:00:12 00:00:06 < 00:00:01
[VT] indicates that a file or directory is accessible from the Virginia Tech campus network only.

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.