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Start Over Author "Atkinson P" Journal international journal of remote sensing
30 results on '"Atkinson P"'

25. Estimating per-pixel thematic uncertainty in remote sensing classifications.

Author

Brown, K. M., Foody, G. M., and Atkinson, P. M.

Subjects
REMOTE sensing, AEROSPACE telemetry, DETECTORS, AERONAUTICAL communications systems, THEMATIC analysis, PIXELS
Abstract

Standard methodologies for estimating the thematic accuracy of hard classifications, such as those using the confusion matrix, do not provide indications of where thematic errors occur. However, spatial variation in thematic error can be a key variable affecting output errors when operations such as change detection are applied. One method of assessing thematic error on a per-pixel basis is to use the outputs of a classifier to estimate thematic uncertainty. Previous studies that have used this approach have generally used a single classifier and so comparisons of the relative accuracy of classifiers for predicting per-pixel thematic uncertainty have not been made. This paper compared three classification methods for predicting thematic uncertainty: the maximum likelihood, the multi-layer perceptron and the probabilistic neural network. The results of the study are discussed in terms of selecting the most suitable classifier for mapping land cover or predicting thematic uncertainty. [ABSTRACT FROM AUTHOR]

Published
2009
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27. The influence of the percentage cover and biomass of clover on the reflectance of mixed pasture

Author

Atkinson, Peter M. and Plummer, Stephen E.

Abstract

The reflectance of a canopy of mixed species may be affected, among other things, by the percentage cover of each species or by the proportion of each species in the total biomass. The likelihood of either property affecting reflectance is greatest when two species are differentiable spectrally and spatially as is the case for the species of grass and clover that are common in pasture in the U.K. This Letter examines the relations of the percentage cover of clover with reflectance and the proportion of clover in the total biomass with reflectance for a field of pasture in Belper in Derbyshire, U.K. using partial correlation analysis

Published
1993
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28. Improving Thematic Mapper land cover classification using filtered data

Author

Atkinson, Paula, Cushnie, Janis, Townshend, John, and Wilson, Andrew

Abstract

In an attempt to alleviate the classification problems introduced by the higher spatial resolution of the Thematic Mapper in comparison to the Muitispectral Scanner, classifications were performed on two to six band combinations, first using Thematic Mapper bands only, and subsequently replacing band 5 by its mean-filtered and median-filtered counterpart. The combination of filtered data with non-filtered data smooths out scene noise while retaining some of the boundary detail.

Published
1985
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