Dynamic monitoring and evaluation of vegetation coverage of coal mining area

LI Yang

doi:10.3969/j.issn.1007-7677.2016.03.017

Abstract：Vegetation coverage is the one of the important indicators to measure the surface vegetation and ecosystem situation,it is the necessary premise and foundation for ecosystem health assessment.Taking the TM remote sensing images of two time phases( the year of 2010 and 2014 )as the data source,and taking the normalized differential vegetation index(NDVI)pixel dichotomy as the estimation model of vegetation coverage,the vegetation coverage(for nearly five years)of Xiangning mining area of Jinzhong coal base was calculated,and the vegetation coverage distribution image and vegetation coverage changing image were generated for different time sequences, so that the temporal and spatial variation of vegetation coverage for Xiangning mining area could be analyzed.The results showed that,in 2010~2014,the vegetation coverage of Xiangning mining area showed a degradation trend,the vegetation coverage degradation area accounted for 33.38% of the whole area,and the percentage of vegetation coverage improving area was only 4. 34%. From the aspect of space, we could see that the vegetation coverage degradation was mainly in the coal mining areas,therefore,the change of vegetation coverage of coal mining area could be calculated through remote sensing method, and through this method, the ecological and environmental effects caused by coal development could be evaluated.