Remote Sensing Monitoring for Assessing Vegetation Coverage in East Juggar Desert of Xinjiang
This paper described the application of Landsat5/TM,Landsat7/ETM+ and Landsat8/OLI image data (the year 2006,2010 and 2014) of the east part of Juggar Desert,from which NDVIs were extracted after radiation corrections,and combined with the dimidiate pixel model the vegetation coverage of above three years were calculated,respectively;besides,based on ENVI and ArcGIS the vegetation coverage was classified,the variation between desert and oasis cover in the Juggar Desert was analyzed,and the vegetation coverage variation-transfer-matrix was calculated.Furthermore,in reference to the historical meteorological and land use data the vegetation-variation-factors were analyzed as well.Consequently,the above studies indicated that vegetation coverage continued to declined during the study period (from 2006 to 2014) with vegetation patches being fragmented gradually;and the vegetation coverage annual-expansion-rate was 0.33％ for grades I and 4.24％ for grade V,while grades Ⅱ,m and Ⅳ,reduced to 31％,19％ and 14％,respectively.To sum up,vegetation in the desert tended to degraded continuously,the degraded vegetation area being larger the recovered one;it were precipitation and temperature during the period that affected the vegetation degradation,in addition,increasing human activities and the harsh natural environment accelerated the phenomenon.
NETL
NSTL
万方数据
维普
