Pontius, R. Gil Jr., 2000. Quantification error versus location error in comparison of categorical maps. Photogrammetric Engineering & Remote Sensing. Volume 66 (Issue 8):Pages 1011-1016.


Quantification error versus location error in comparison of categorical maps

R. Gil Pontius, Jr.

Abstract

This paper analyses quantification error versus location error in comparison between two cellular maps that show a categorical variable. Quantification error occurs when the quantity of cells of a category in one map is different than the quantity of cells of that category in the other map. Location error occurs where the location of a category in one map is different than the location of that category in the other map. The standard Kappa index of agreement is usually not appropriate for map comparison. This paper offers alternative statistics: 1) proportion correct with perfect ability to specify location, 2) proportion correct with perfect ability to specify quantity, 3) Kappa for no ability, 4) Kappa for location and 5) Kappa for quantity. These statistics can help scientists improve classification. This paper applies these theoretical concepts to the validation of a land-use change model for the Ipswich Watershed, USA.

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Copyright 2000 Graduate School of Geography, Clark University