Prof. Jason P. Evans
Climate Change Research Centre
University of New South Wales
Comparing Optical and Microwave Remote Sensing-based Vegetation Density over Mongolia for 1988-2006.
Liu, Y.Y., R.A.M. De Jeu, M.F. McCabe, J.P. Evans, A.I.J.J.M. Van Dijk
3rd International Symposium on Remote Sensing of Environment, Sydney, Australia, 10-15 April 2011. Abstract
Vegetation density plays an important role in
water and energy balance. Satellite-based optical and
microwave sensors are expected to provide complementary
vegetation information. Here we compared NDVI from
AVHRR and vegetation optical depth (VOD) from SSM/I
over Mongolia from 1988 through 2006. Both products show
similar spatial distribution in annual average and are able
to capture similar inter-annual variations. However, the
long term changes reflected by them are divergent.
Microwave based VOD shows considerable decreasing
trends over grassland, whereas NDVI shows slight declines
and even increasing trends. Further investigations are
required to identify the causes for their divergence.
Key Figure Figure 4: Trend in peak monthly NDVI and VOD of each year during 1988 – 2006 using Mann-Kendall analysis. 
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Last updated 31st January 2013 |
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