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Early spatial and temporal validation of MODIS LAI product in the Southern Africa Kalahari

Record type: Article

We evaluate the operational MODIS Leaf Area Index (LAI) product using field-sampled data collected at five sites in southern Africa in March 2000. One site (Mongu, Zambia) was sampled monthly throughout the year. All sites were along the International Geosphere Biosphere Programme's (IGBP) Kalahari Transect, which features progressively lower annual precipitation, and hence, lower vegetation productivity, from north to south. The soils are consistently sandy. At each site, we sampled the vegetation overstory along three 750-m transects using the Tracing Radiation and Architecture in Canopies (TRAC) instrument. The resulting plant area index values were adjusted with ancillary stem area data to estimate LAI. Despite some instrument characterization and production issues in the first year of MODIS operations, our results suggest the first-year MODIS LAI algorithm correctly accommodates structural and phenological variability in semiarid woodlands and savannas, and is accurate to within the uncertainty of the validation approach used here. Limitations of this study and its conclusions are also discussed.

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Citation

Privette, J.L., Myneni, R.B., Knyazikhin, Y., Mukelabai, M., Roberts, G., Tian, Y., Wang, Y. and Leblanc, S.G. (2002) Early spatial and temporal validation of MODIS LAI product in the Southern Africa Kalahari Remote Sensing of Environment, 83, (1-2), pp. 232-243. (doi:10.1016/S0034-4257(02)00075-5).

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Published date: November 2002

Identifiers

Local EPrints ID: 188495
URI: http://eprints.soton.ac.uk/id/eprint/188495
ISSN: 0034-4257
PURE UUID: d1c7fd43-9eea-4030-9dd2-314abd625f7f

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Date deposited: 31 May 2011 15:34
Last modified: 18 Jul 2017 11:42

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Contributors

Author: J.L. Privette
Author: R.B. Myneni
Author: Y. Knyazikhin
Author: M. Mukelabai
Author: G. Roberts
Author: Y. Tian
Author: Y. Wang
Author: S.G. Leblanc

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