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Author (up) Cohen, W.B.; Maiersperger, T.K.; Turner, D.P.; Ritts, W.D.; Pflugmacher, D.; Kennedy, R.E.; Kirschbaum, A.; Running, S.W.; Costa, M.; Gower, S.T. openurl 
  Title MODIS land cover and LAI collection 4 product quality across nine sites in the western hemisphere Type Journal Article
  Year 2006 Publication IEEE Transactions on Geoscience and Remote Sensing Abbreviated Journal  
  Volume 44 Issue 7 Pages 1843-1857  
  Keywords land cover; landsat; leaf area index (lai); moderate resolution imaging spectrometer (modis); scaling; validation; leaf-area index; gross primary production; net primary production; in-situ; carbon; ecosystem; forests; pine; disturbance  
  Abstract Global maps of land cover and leaf area index (LAI) derived from the Moderate Resolution Imaging Spectrometer (MODIS) reflectance data are an important resource in studies of global change, but errors in these must be characterized and well understood. Product validation requires careful scaling from ground and related measurements to a grain commensurate with MODIS products. We present an updated BigFoot project protocol for developing 25-m validation data layers over 49-km(2) study areas. Results from comparisons of MODIS and BigFoot land cover and LAI products at nine contrasting sites are reported. In terms of proportional coverage, MODIS and BigFoot land cover were in close agreement at six sites. The largest differences were at low tree cover evergreen needleleaf sites and at an Arctic tundra site where the MODIS product overestimated woody cover proportions. At low leaf biomass sites there was reasonable agreement between MODIS and BigFoot LAI products, but there was not a particular MODIS LAI algorithm pathway that consistently compared most favorably. At high leaf biomass sites, MODIS LAI was generally overpredicted by a significant amount. For evergreen needleleaf sites, LAI seasonality was exaggerated by MODIS. Our results suggest incremental improvement from Collection 3 to Collection 4 MODIS products, with some remaining problems that need to be addressed.  
  Corporate Author Thesis  
  Publisher Place of Publication Cohen, WBUSDA, Pacific NW Res Stn, Forestry Sci Lab, Corvallis, OR 97331 USAUSDA, Pacific NW Res Stn Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0196-2892 ISBN Medium  
  Area Expedition Conference  
  Notes Part 1061IJTimes Cited:2Cited References Count:39 Approved no  
  Call Number geomatics @ Cohen2006 Serial 286  
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