A general framework for error analysis in measurement-based GIS Part 4: Error analysis in length and area measurements

Yee Leung, Jiang Hong Ma, Michael F. Goodchild

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

This is the final of a series of four papers on the development of a general framework for error analysis in measurement-based geographic information systems (MBGIS). In this paper, we discuss the error analysis problems in length and area measurements under measurement error (ME) of the defining points. In line with the basic ME model constructed in Part 1 of this series, we formulate the ME models for length and area measurements. For length measurement and perimeter measurement, the approximate laws of error propagation are derived. For area measurement, the exact laws of error propagation are obtained under various conditions. An important result is that area measurement is distributed as a linear combination of independent non-central chi-square variables when the joint ME vectors of vertices coordinates are normal. In addition, we also give a necessary and sufficient condition under which the area measurement estimator is unbiased. As a comparison, the approximate law of error propagation in area measurement is also considered and its approximation is substantiated by numerical experiments.

Original languageEnglish (US)
Pages (from-to)403-428
Number of pages26
JournalJournal of Geographical Systems
Volume6
Issue number4
DOIs
StatePublished - Dec 1 2004
Externally publishedYes

Keywords

  • Error propagation
  • Geographic information systems
  • Length and area measurement
  • Measurement error
  • Noncentral chi-square variable

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Earth-Surface Processes

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