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|Title:||Area estimation from a sample of satellite images: the impact of stratification on the clustering efficiency|
|Authors:||GALLEGO PINILLA Francisco; STIBIG Hans-Jurgen|
|Citation:||INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION vol. 22 p. 139-146|
|Publisher:||ELSEVIER SCIENCE BV|
|Type:||Articles in periodicals and books|
|Abstract:||Several projects dealing with land cover area estimation in large regions consider samples of sites to be analysed with high or very high resolution satellite images. This paper analyses the impact of stratification on the efficiency of sampling schemes of sites or clusters with a size between 5 km 5 km and 30 km 30 km. Cluster sampling schemes are compared with samples of unclustered points, both without and with stratification. The correlograms of land cover classes provide a useful tool to assess the sampling value of clusters in terms of variance; this sampling value is expressed as “equivalent number of points” of a site. The results obtained for the European Union and South-East Asia suggest that stratification generally increases the “equivalent number of points”, whose values remain however moderate. When land cover data are acquired by photo-interpretation of tiles extracted from larger images, such as Landsat TM, a sampling plan based on a larger number of smaller sites might be more efficient.|
|JRC Directorate:||Sustainable Resources|
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