COMPARATIVE ANALYSIS OF LANDSAT-5 AND LANDSAT-7 DATA FOR LAND COVER CLASSIFICATION, QUALITATIVE EVALUATION OF IMAGE FUSION PRODUCTS AND INVESTIGATION OF THERMAL CHARACTERISTICS OF INDUSTRIAL DISCHARGE SOURCES

摘要

The Western European Union Satellite Centre (WEUSC) recently commenced participation in the evaluation of the continuity of data from the LANDSAT programme. A study area has been selected in the province of Extremadura, Western Spain, which comprises a variety of land cover categories and geological formations. In addition the Almaraz power generating facilities were included in the study area. Using image acquisition from LANDSAT-5 and 7 and near simultaneous acquisition of SPOT panchromatic images for several dates, a series of comparisons designed to evaluate qualitative and quantitative aspects of the two multi-spectral data sets is undertaken. Image fusion products utilising panchromatic data with a smaller pixel size (SPOT panchromatic 10 m pixels and LANDSAT-7 Band 8 15 m pixels) and multi-spectral data (LANDSAT-5 Thematic Mapper (TM) and LANDSAT-7 Enhanced Thematic Mapper Plus (ETM+)) with coarser pixels are investigated to evaluate their use as image interpretation products. The consistency between results made using supervised classification approach to LANDSAT-5 and LANDSAT-7 are presented. Comparison with existing geological and land cover maps is made to assess the results of the image classification/interpretation. The utility of the thermal infrared band of the TM and ETM+ - with special attention to the improvements implemented on the last one - is investigated using as objective the temperature in the reservoir immediately adjacent to the Almaraz power generating facility.