Abstract:

With the support of GIS spatial analysis tools and ERDAS spatial language,ETM image and land utilization status data from LandSAT satellite No.7 are used to extract RVI,NDVI and MSAVI vegetation indices in ETM image. And zonal statistic analysis tool in ArcGIS is applied in the statistics and analysis of the distribution and characteristics of the three vegetation indices in each land utilization type. The result indicates that the characteristics of RVI,NDVI and MSAVI in land utilization are similar,and they can reflect vegetation coverage extents well. But their manifestations are different-RVI is high,NDVI and MSAVI are lower,and the vegetation coverage extents they represented are relatively low,vice versa. The three vegetation indices can distinguish farmland,nonvegetation coverage area and vegetation coverage area well,but it is difficult to distinguish forestland and shrubbery land,as well as dry land and orchard.

Key words: vegetation indices, geographical information system, remote system