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
Publication Year: 2012
JRC N°: JRC61656
ISSN: 0143-1161
URI: http://www.tandfonline.com/doi/abs/10.1080/01431161.2011.602993
DOI: 10.1080/01431161.2011.602993
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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