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|Title:||The efficiency of sampling very high resolution images for area estimation in the European Union.|
|Authors:||GALLEGO PINILLA Francisco|
|Citation:||INTERNATIONAL JOURNAL OF REMOTE SENSING vol. 33 no. 6 p. 1868-1880|
|Publisher:||TAYLOR \& FRANCIS LTD|
|Type:||Articles in periodicals and books|
|Abstract:||A sample of Very High Resolution (VHR) images is a natural alternative to a full coverage to reduce costs. Using a square grid as sampling frame and a land cover map as pseudo-truth, the sampling accuracy is easily assessed, but the efficiency is biased because the real land cover has a different spatial structure. To estimate the sampling efficiency we use a method based on intra-cluster correlations computed from correlograms. The ¿equivalent number of points¿ is a practical efficiency indicator for sites of a given size. We obtained poor efficiency results for area estimation of major land cover types in the European Union (EU) with simple random sampling; for example for the estimation of the total arable land area, each site of 10 x 10 km is equivalent to 3 unclustered points.|
|JRC Directorate:||Sustainable Resources|
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