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Aral sea, visible R-M pros infrastructure are good indicators of activities, *precision problem *data availibility *data compatibility has contributed towards use of old maps as reference, use of AVHRR, for sea T cons *low spatial resolution *up only since 79, use of Landsat TM allows *see those who disappeared and those who appeared *also to see the extension of cotton fields, use of LandSat band 1 (soil-vegetation discrimination) allows to track advance of desert, *long term study *cycle *not easy to evaluate *global warming leads to use of LandSat MSS for dust storm, replacement of species by others species leads to use of landsat band 3, visible R-M cons require identification, salinization of soil is constrained by *need of ancillary datas *ambiguity on spectral signature *need of datas for the last decades *area to cover is even bigger than aral sea, use of Landsat band 1or 4 pro *good spatial resoultion *up since a long time (72) *biweekly report