MODIS Vegetative Cover Conversion and Vegetation Continuous Fields
Land cover change occurs at various spatial and temporal scales. For example, large-scale mechanical removal of forests for agro-industrial activities contrasts with the small-scale clearing of subsistence farmers. Such dynamics vary in spatial extent and rate of land conversion. Such changes are attributable to both natural and anthropogenic factors. For example, lightning- or human-ignited fires burn millions of acres of land surface each year. Further, land cover conversion requires contrasting with the land cover modification. In the first instance, the dynamic represents extensive categorical change between two land cover types. Land cover modification mechanisms such as selective logging and woody encroachment depict changes within a given land cover type rather than a conversion from one land cover type to another. This chapter describes the production of two standard MODIS land products used to document changes in global land cover. The Vegetative Cover Conversion (VCC) product is designed primarily to serve as a global alarm for areas where land cover change occurs rapidly (Zhan et al. 2000). The Vegetation Continuous Fields (VCF) product is designed to continuously represent ground cover as a proportion of basic vegetation traits. Terra’s launch in December 1999 afforded a new opportunity to observe the entire Earth every 1.2 days at 250-m spatial resolution. The MODIS instrument’s appropriate spatial and temporal resolutions provide the opportunity to substantially improve the characterization of the land surface and changes occurring thereupon (Townshend et al. 1991).
KeywordsBurning Landsat Eurasia AVHRR IKONOS
- Descloitres J, Vermote E (1999) Operational retrieval of the spectral surface reflectance and vegetation index at global scale from SeaWiFS data. International Conference on Aerosols, Radiation Budget – Land Surfaces – Ocean Colour: The Contribution of POLDER and New Generation Spaceborne Sensors to Global Change Studies, 18–22 January 1999, Meribel, France. CNES, Toulouse, France, Land Surfaces-O-02, pp 1–4.Google Scholar
- DeFries R, Field CB, Fung I, Justice CO, Matson PA, Matthews M, Mooney HA, Potter CS, Prentice K, Sellers PJ, Townshend J, Tucker CJ, Ustin SL, Vitousek PM (1995) Mapping the land surface for global atmosphere-biosphere models: toward continuous distributions of vegetation’s functional properties. J Geophys Res 100(20): 20, 867–820,882Google Scholar
- Hansen MC, DeFries RS, Townshend JRG, Carroll M, Dimiceli C, Sohlberg RA (2003) Global percent tree cover at a spatial resolution of 500 meters: first results of the MODIS Vegetation Continuous Fields Algorithm, 7 (10), 15 p. [Available online at http://EarthInteractions.org].
- NASA/University of Maryland (2002) MODIS Hotspot/Active Fire Detections. Dataset. MODIS Rapid Response Project, NASA/GSFC [producer], University of Maryland, Fire Information for Resource Management System [distributors]. [Available online at [http://maps.geog.umd.edu]
- PRODES Digital (2002) http://www.obt.inpe.br/prodes/ [last accessed June, 2003]
- USDA Forest Service Remote Sensing Applications Center – Burned Area Emergency Response Imagery Support Program (2006) Available from http://www.fs.fed.us/eng/rsac/baer/ [last accessed March 15, 2006]
- Vermote E, Ray J (1999) MODIS surface reflectance user’s guide. http://modis-land.gsfc.nasa.gov/MOD09/MOD09ProductInfo/MOD09Level2G250m.htm