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By Russell G. Congalton

Congalton does a superb activity featuring distant sensing accuracy evaluate ideas. as well as the idea, he presents functional examples to assist in utilizing the speculation to genuine international situations.

The booklet turns out approach over-priced for its dimension.

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Additional info for Assessing the Accuracy of Remotely Sensed Data: Principles and Practices, Second Edition (Mapping Science)

Sample text

Also relying on Greenwalt and Schultz (1962, 1968), the NSSDA specifies that positional accuracy be characterized using RMSE, requires that accuracy be reported in ground distance units at the “95% confidence level,”† and provides guidance on how samples are to be selected. NSSDA continues to be the accepted standard on positional accuracy assessment. It is often used in conjunction with the ASPRS largescale map standards, with NSSDA providing standardized processes for assessing positional accuracy and the ASPRS (1990) standards setting the maximum errors allowable for different map scales.

Some mapping texts use the subscript “z” to denote vertical error. Because this text (and most statistics texts) uses the variable Zi to denote the standard normal variable, we use the subscript “v” to denote vertical error. 8 Areas and Zi values of the standard normal distribution corresponding to the probability levels of various map accuracy standards. The Principles of Error Theory and Cartographic Applications report is the first report to propose use of the Zi(Sv) interval as a standard in estimating positional accuracy (Greenwalt and Schultz, 1962, 1968).

Rather the assumption that the map was correct or at least good enough prevailed. Then along came digital remote sensing, and some of these fundamental assumptions about photo interpretation needed to be further scrutinized and adapted. indd 15 11/4/08 5:59:34 PM 16 Assessing the Accuracy of Remotely Sensed Data: Principles and Practices As in the early days of aerial photography, the launch of Landsat 1 in 1972 resulted in a great burst of exuberant effort as researchers and scientists charged ahead trying to develop the field of digital remote sensing.

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