Abstract
NOAA Advanced Very High Resolution Radiometer (AVHRR) data were used to estimate green vegetation coverage of grasslands for semi-arid region. Two estimation models based on NDVI and TSAVI were applied to produce green vegetation cover images and compared with ground data collected in grasslands of Mongolia. There was significant agreement between ground data and the estimate of satellite data. The estimate by TSAVI has better accuracy for the green vegetation cover with low densities and the estimate by NDVI performs better result for middle and high vegetation cover. The result suggests that the joint use of the NDVI and TSAVI can improve accuracy of the estimate.
