Comparing optical and microwave remote sensing-based vegetation density over mongolia for 1988-2006

Y. Liu*, R. De Jeu, Matthew McCabe, J. Evans, A. Van Dijk

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

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.

Original languageEnglish (US)
StatePublished - Dec 1 2011
Event34th International Symposium on Remote Sensing of Environment - The GEOSS Era: Towards Operational Environmental Monitoring - Sydney, NSW, Australia
Duration: Apr 10 2011Apr 15 2011

Other

Other34th International Symposium on Remote Sensing of Environment - The GEOSS Era: Towards Operational Environmental Monitoring
CountryAustralia
CitySydney, NSW
Period04/10/1104/15/11

Keywords

  • Microwave
  • NDVI
  • Optical
  • Remote sensing
  • Vegetation optical depth (VOD)

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Environmental Engineering

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