Evaluating the accuracy of digital orthophoto quadrangles (DOQ) in the context of parcel-based GIS

Document Type

Article

Publication Date

1-1-2001

Abstract

A crucial component in developing an effective GIS based on digital parcel base maps is the acquisition of accurate digital land base data. Accurate land base data make spatial analysis less troublesome and enables better decision making. However, acquisition of accurate spatial data from traditional data compilation techniques could come with a hefty price tag. A popular solution for the accuracy versus cost dilemma is the use of USGS Digital Orthophoto Quadrangles (DOQ). DOQs provide very inexpensive continuous land coverage that could be converted with relatively modest means and expense into a digital parcel map. Given that DOQs are becoming a common solution for establishing digital parcel coverages, it is prudent to evaluate their accuracy. DOQs are considered to comply with the National Mapping Accuracy Standards (NMAS), but that statement does not render a constructive measure for the accuracy of the data because of the way (or lack of) a dataset is certified as being in compliance with the NMAS. A better approach for evaluating the accuracy of DOQs is to follow the National Standard for Spatial Data Accuracy (NSSDA) guidelines. In this paper a DOQ was evaluated with the NSSDA standards in order to establish the positional accuracy of the data. The accuracy was found to be within ±25 feet (±7.6 m) at the 95 percent confidence level. The DOQ was also evaluated for its geometric, radiometric, and mosaicking accuracies. This aspect of the DOQ was found to be satisfactory. Finally, the appropriateness of DOQs in the context of a parcel-based GIS was addressed.

Identifier

0035136757 (Scopus)

Publication Title

Photogrammetric Engineering and Remote Sensing

ISSN

00991112

First Page

199

Last Page

205

Issue

2

Volume

67

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