Title page for ETD etd-02072013-040107

Type of Document Master's Thesis
Author Mayers, Margaret Grace
URN etd-02072013-040107
Title A study of four raster-based data generalization procedures
Degree Master of Science
Department Geography
Advisory Committee
Advisor Name Title
Campbell, James B. Jr. Committee Chair
Carstensen, Laurence William Jr. Committee Member
Smith, James L. Committee Member
  • Alaska
Date of Defense 1987-05-05
Availability restricted

Strategies for generalizing raster-based land cover data were investigated. Generalization strategies were studied as part of the U.S. Geological Survey's (USGS) Federal Land Information System (FLIS). Area filtering, category aggregation, resampling, and modal search and replace comprised the strategies tested on USGS Alaska Interim Land Cover data.

Generalization of the land cover data was deemed necessary for two reasons: 1) reduction in the volume of homogeneous land cover regions required for computer memory storage, and 2) simplification of the highly complex land cover map. The generalization strategies were evaluated based upon how well they maintained the integrity of land cover information while minimizing the number of homogeneous land cover regions. Maintenance of land cover information after application of a generalization strategy was measured by omission and commission errors, percent unchanged, Cohen's statistic, and the number of land cover regions.

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