Read e-book online Remote sensing and GIS accuracy assessment PDF

By Ross S. Lunetta, John G. Lyon

ISBN-10: 156670443X

ISBN-13: 9781566704434

The problems inherent in assessing the accuracy of large-area spatial info units, their next research through GIS, and their significance to panorama characterization make the advance of equipment for strong accuracy review a serious problem. In December 2002, the U.S. EPA subsidized a symposium eager about comparing the scienctific components suitable to performaning of accuracy checks for distant sensing derived information units and GIS information research and built-in items. the result's this peer-reviewed textual content from a world staff of scientists representing federal, kingdom and native governments, academia, and non-governmental corporations.

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Fm Page 16 Saturday, June 5, 2004 10:14 AM 16 REMOTE SENSING AND GIS ACCURACY ASSESSMENT In practice, both regional and local control may be employed in the same design. The most likely combination in such a multistage design would be to exercise regional control via two-stage cluster sampling and local control via one-stage cluster sampling, as follows. , a 6- ¥ 6-km area). , 3 ¥ 3 block of pixels). The first-stage sample consists of primary sampling units (PSUs), but not every 3 ¥ 3 block in each sampled PSU is observed.

1999) demonstrate inference problems in the particular case of a citizen-based, lake water-quality monitoring program. ” In the former case, rarely are the model assumptions explicitly stated or evaluated in accuracy assessment. The latter option is generally regarded as unacceptable, just as it is unacceptable to reduce accuracy assessment to an “it looks good” judgment. Another use of nonprobability sampling is to select a relatively small number of sample sites that are, based on expert judgment, representative of the population.

A probability sampling design provides a good foundation for implementing small-area estimation methods to obtain the area proportions. 4 NONPROBABILITY SAMPLING Because nonprobability sampling is often more convenient and less expensive, it is useful to review some manifestations of this departure from a statistically rigorous approach. Restricting the probability sample to areas near roads for convenient access or to homogeneous 3 ¥ 3 pixel clusters to reduce confounding of spatial and thematic error are two typical examples of nonprobability sampling.

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Remote sensing and GIS accuracy assessment by Ross S. Lunetta, John G. Lyon

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