The MODIS (Collection V005) BRDF/albedo product: Assessment of spatial representativeness over forested landscapes

Miguel O. Román, Crystal B. Schaaf, Curtis E. Woodcock, Alan H. Strahler, Xiaoyuan Yang, Rob H. Braswell, Peter S. Curtis, Kenneth J. Davis, Danilo Dragoni, Michael L. Goulden, Lianhong Gu, David Y. Hollinger, Thomas E Kolb, Tilden P. Meyers, J. William Munger, Jeffrey L. Privette, Andrew D. Richardson, Tim B. Wilson, Steven C. Wofsy

Research output: Contribution to journalArticle

159 Citations (Scopus)

Abstract

A new methodology for establishing the spatial representativeness of tower albedo measurements that are routinely used in validation of satellite retrievals from global land surface albedo and reflectance anisotropy products is presented. This method brings together knowledge of the intrinsic biophysical properties of a measurement site, and the surrounding landscape to produce a number of geostatistical attributes that describe the overall variability, spatial extent, strength of the spatial correlation, and spatial structure of surface albedo patterns at separate seasonal periods throughout the year. Variogram functions extracted from Enhanced Thematic Mapper Plus (ETM+) retrievals of surface albedo using multiple spatial and temporal thresholds were used to assess the degree to which a given point (tower) measurement is able to capture the intrinsic variability of the immediate landscape extending to a satellite pixel. A validation scheme was implemented over a wide range of forested landscapes, looking at both deciduous and coniferous sites, from tropical to boreal ecosystems. The experiment focused on comparisons between tower measurements of surface albedo acquired at local solar noon and matching retrievals from the MODerate Resolution Imaging Spectroradiometer (MODIS) (Collection V005) Bidirectional Reflectance Distribution Function (BRDF)/albedo algorithm. Assessments over a select group of field stations with comparable landscape features and daily retrieval scenarios further demonstrate the ability of this technique to identify measurement sites that contain the intrinsic spatial and seasonal features of surface albedo over sufficiently large enough footprints for use in modeling and remote sensing studies. This approach, therefore, improves our understanding of product uncertainty both in terms of the representativeness of the field data and its relationship to the larger satellite pixel.

Original languageEnglish (US)
Pages (from-to)2476-2498
Number of pages23
JournalRemote Sensing of Environment
Volume113
Issue number11
DOIs
StatePublished - Nov 16 2009

Fingerprint

albedo (reflectance)
bidirectional reflectance
moderate resolution imaging spectroradiometer
MODIS
reflectance
Distribution functions
albedo
Imaging techniques
Towers
Satellites
Pixels
pixel
Ecosystems
Remote sensing
Anisotropy
variogram
product
distribution
footprint
remote sensing

Keywords

  • 6S
  • AmeriFlux
  • BRDF
  • EOS Land Validation Core Sites
  • ETM+
  • FLUXNET
  • Geostatistics
  • MODIS
  • Remote sensing
  • Spatial analysis
  • Surface albedo
  • Validation

ASJC Scopus subject areas

  • Computers in Earth Sciences
  • Soil Science
  • Geology

Cite this

Román, M. O., Schaaf, C. B., Woodcock, C. E., Strahler, A. H., Yang, X., Braswell, R. H., ... Wofsy, S. C. (2009). The MODIS (Collection V005) BRDF/albedo product: Assessment of spatial representativeness over forested landscapes. Remote Sensing of Environment, 113(11), 2476-2498. https://doi.org/10.1016/j.rse.2009.07.009

The MODIS (Collection V005) BRDF/albedo product : Assessment of spatial representativeness over forested landscapes. / Román, Miguel O.; Schaaf, Crystal B.; Woodcock, Curtis E.; Strahler, Alan H.; Yang, Xiaoyuan; Braswell, Rob H.; Curtis, Peter S.; Davis, Kenneth J.; Dragoni, Danilo; Goulden, Michael L.; Gu, Lianhong; Hollinger, David Y.; Kolb, Thomas E; Meyers, Tilden P.; Munger, J. William; Privette, Jeffrey L.; Richardson, Andrew D.; Wilson, Tim B.; Wofsy, Steven C.

In: Remote Sensing of Environment, Vol. 113, No. 11, 16.11.2009, p. 2476-2498.

Research output: Contribution to journalArticle

Román, MO, Schaaf, CB, Woodcock, CE, Strahler, AH, Yang, X, Braswell, RH, Curtis, PS, Davis, KJ, Dragoni, D, Goulden, ML, Gu, L, Hollinger, DY, Kolb, TE, Meyers, TP, Munger, JW, Privette, JL, Richardson, AD, Wilson, TB & Wofsy, SC 2009, 'The MODIS (Collection V005) BRDF/albedo product: Assessment of spatial representativeness over forested landscapes', Remote Sensing of Environment, vol. 113, no. 11, pp. 2476-2498. https://doi.org/10.1016/j.rse.2009.07.009
Román, Miguel O. ; Schaaf, Crystal B. ; Woodcock, Curtis E. ; Strahler, Alan H. ; Yang, Xiaoyuan ; Braswell, Rob H. ; Curtis, Peter S. ; Davis, Kenneth J. ; Dragoni, Danilo ; Goulden, Michael L. ; Gu, Lianhong ; Hollinger, David Y. ; Kolb, Thomas E ; Meyers, Tilden P. ; Munger, J. William ; Privette, Jeffrey L. ; Richardson, Andrew D. ; Wilson, Tim B. ; Wofsy, Steven C. / The MODIS (Collection V005) BRDF/albedo product : Assessment of spatial representativeness over forested landscapes. In: Remote Sensing of Environment. 2009 ; Vol. 113, No. 11. pp. 2476-2498.
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