6923e3d3-7dba-437f-bafe-cfd2db018aaa eng Zhanguo Bai 2012-02-22T15:16:06 ISO 19115:2003/19139 1.0 2 1925 0.072727 4943 0.072727 yes GCS_WGS_1984 Global Pattern, Trends and Confidence Levels of NDVI Standard Deviation (1981-2003) 2008-10-22T07:00:00 First edition NDVI standard deviation is the root mean square deviation of the NDVI time series values (annual) from their arithmetic mean. It is recommended that the maps should be considered in the field investigation - in particular the land use change during the study period (1981-2003). A positive change in the value of a pixel-level NDVI standard deviation over time relates to increased dispersion of values, not increasing NDVI; similarly, a negative NDVI standard deviation dispersion – means decreasing dispersion of NDVI around mean values, not decreasing NDVI. NDVI standard deviation is to measure the spread of NDVI values. Food and Agriculture Organization of United Nations - HQs Viale delle Terme di Caracalla Rome 00153 Italy ISRIC - World Soil Information +31 (0)317 483 735 Duivendaal 9 Wageningen Wageningen 6701 AR The Netherlands soil.isric@wur.nl UN FAO - HQs Director of Land and Water Division Viale delle Terme di Caracalla Rome 00153 Italy NRL-Director@fao.org S6abcd.gif large_thumbnail gif S6abcd_s.gif thumbnail gif NDVI Land degradation Land improvement Remote sensing Rain-use efficiency GLADA World eng environment 1981-07-01T07:00:00 2003-12-01T13:56:00 -180 180 -90 90 Within the FAO program Land Degradation Assessment in Drylands (LADA), the present "Global Assessment of Land Degradation and Improvement" uses remote sensing to identify areas where significant biological change is happening, both hot spots of land degradation and bright spots of land improvement. In the next phase of the program, hot spots and bright spots will be further characterised in the field by national teams. http://www.isric.org WWW:LINK-1.0-http--link ISRIC - World Soil Information website http://www.fao.org/nr/lada/index.php?/Global.html WWW:LINK-1.0-http--link LADA - Land Degradation Assessment in Drylands - FAO 2008 Web site http://www.fao.org:80/geonetwork/srv/en/resources.get?id=37059&fname=Global NDVI standard deviation Fig S6a.zip&access=private WWW:DOWNLOAD-1.0-http--download Global NDVI standard deviation Fig S6a.zip Global multi-year mean annual NDVI standard deviation 1981-2003 http://www.fao.org:80/geonetwork/srv/en/resources.get?id=37059&fname=Global NDVI standard deviation Fig S6b.zip&access=private WWW:DOWNLOAD-1.0-http--download Global NDVI standard deviation Fig S6b.zip Global trend in annual NDVI standard deviation 1981-2003 (% change) http://www.fao.org:80/geonetwork/srv/en/resources.get?id=37059&fname=Global NDVI standard deviation Fig S6c.zip&access=private WWW:DOWNLOAD-1.0-http--download Global NDVI standard deviation Fig S6c.zip Global changes in annual NDVI standard deviation 1981-2003 (absolute change) http://www.fao.org:80/geonetwork/srv/en/resources.get?id=37059&fname=Global NDVI standard deviation Fig S6d.zip&access=private WWW:DOWNLOAD-1.0-http--download Global NDVI standard deviation Fig S6d.zip Global confidence levels of trend in annual NDVI standard deviation 1981-2003 http://www.fao.org:80/geonetwork/srv/en/resources.get?id=37059&fname=GLADA Report 5.pdf&access=private WWW:DOWNLOAD-1.0-http--download GLADA Report 5.pdf GLADA Report 5 - Global Assessment of Land Degradation and Improvement- PDF format http://data.fao.org/maps/wms?styles=geonetwork_figs6a_37059_style OGC:WMS-1.1.1-http-get-map GEONETWORK:figs6a_37059 Global Pattern, Trends and Confidence Levels of NDVI Standard Deviation (1981-2003) http://data.fao.org/maps/wms?styles=geonetwork_figs6b_37059_style OGC:WMS-1.1.1-http-get-map GEONETWORK:figs6b_37059 Global Pattern, Trends and Confidence Levels of NDVI Standard Deviation (1981-2003) http://data.fao.org/maps/wms?styles=geonetwork_figs6c_37059_style OGC:WMS-1.1.1-http-get-map GEONETWORK:figs6c_37059 Global Pattern, Trends and Confidence Levels of NDVI Standard Deviation (1981-2003) http://data.fao.org/maps/wms?styles=geonetwork_figs6d_37059_style OGC:WMS-1.1.1-http-get-map GEONETWORK:figs6d_37059 Global Pattern, Trends and Confidence Levels of NDVI Standard Deviation (1981-2003) Last Updated 2008-10-22T10:00:00