The Boston University team collected several data sets along the Kalahari Transect during the SAFARI 2000 wet season field campaign between March 3 and March 18, 2000, to support the validation of the MODIS LAI/FPAR algorithm. Ground measurements of LAI, FPAR, leaf hemispherical reflectance and transmittance, and canopy transmittance were made using a LAI-2000 plant canopy analyzer, an AccuPAR ceptometer, a LiCor 1800-12S External Integrating Sphere (LI-1800) portable spectroradiometer, and an ASD handheld spectroradiometer.
Leaf spectral data are provided in this data set. Leaf spectral measurements were made on samples from dominant tree, shrub, and grass species at five different Kalahari Transect sites -- Mongu in Zambia and Pandamatenga, Maun, Okwa River, and Tshane in Botswana (from north to south) -- where vegetation ranges from moist closed woodlands to arid sparsely-shrub-covered grasslands. Measurements were made on site with a LI-1800 portable spectroradiometer right after the leaves were cut from the trees or shrubs. Three or four sample leaves of each dominant species were measured.
The data files, in ASCII comma-delimited (.csv) format, contain the wavelength of the measurement (from 400 nm to 1100 nm, at an interval of 1 nm ) and the corresponding fraction of leaf reflectance, transmittance, and albedo (reflectance+transmittance). There is a separate data file for each tree and shrub species sampled at each site and a single file containing unidentified grass species collected from all of the sites. Average values for combined samples of trees and of shrubs at different sites are also provided.
Cite this data set as follows:
Myneni, R. B., Y. Tian, and Y. Wang. 2005. SAFARI 2000 Leaf Spectral Measurements, Kalahari Transect, Wet Season 2000. Data set. Available on-line [http://daac.ornl.gov/] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/773.
Tian, Y., C. E. Woodcock, Y. Wang, J. L. Privette, N. V. Shabanov, L. Zhou, Y. Zhang, W. Buermann, J. Dong, B. Veikkanen, T. Hame, K. Andersson, M. Ozdogan, Y. Knyazikhin, and R. B. Myneni. 2002. Multiscale analysis and validation of MODIS LAI product. I. Uncertainty assessment. Remote Sens. Environ. 83: 414-430.
Tian, Y., C. E. Woodcock, Y. Wang, J. L. Privette, N. V. Shabanov, L. Zhou, Y. Zhang, W. Buermann, J. Dong, B. Veikkanen, T. Hame, K. Andersson, M. Ozdogan, Y. Knyazikhin, and R. B. Myneni. 2002. Multiscale analysis and validation of the MODIS LAI product over Maun, Botswana. II. Sampling Strategy. Remote Sens. Environ, 83: 431-441.
Each data file is organized as described below, in ASCII comma-delimited (.csv) format.
| Column Name | Definition | Units/Format |
|---|---|---|
| Wavelength | Wavelength of measurement (from 400 nm to 1100 nm) | nm |
| Reflectance | Leaf reflectance | fraction (0-1) |
| Transmittance | Leaf transmittance | fraction (0-1) |
| Albedo | Leaf albedo (reflectance+transmittance) | fraction (0-1) |
A summary of the leaf spectal measurement files the Kalahari Transect sites is provided below.
| Pandamatenga Species | |
|---|---|
| 7 species of tree leaves and 3 species of shrub leaves | File Name |
| Shinzophyton rautenii (Tree species 1) | panda_sp1.csv |
| Pterocarpus angolensis (Tree species 2) | panda_sp2.csv |
| Kirkia africana (Tree species 3) | panda_sp3.csv |
| Baikaeia plurijuga (Tree species 4) | panda_sp4.csv |
| Erythropleum africanum (Tree species 5) | panda_sp5.csv |
| Burkea africana (Tree species 6) | panda_sp6.csv |
| Diplorhynchus condylocapo (Tree species 7) | panda_sp7.csv |
| Bauhinia deteriana (Shrub species 1) | panda_sp8.csv |
| Grevia maticola (Shrub species 2) | panda_sp9.csv |
| Baphia massaiensis (Shrub species 3) | panda_sp10.csv |
| Averaged value of tree species 1-3 | panda_sp1-3.csv |
| Averaged value of tree species 1-7 | panda_sp1-7.csv |
| Averaged value of shrub species 1-3 | panda_sp8-10.csv |
| Averaged value of all tree and shrub leaves | panda_sp1-10.csv |
| Maun Species | |
| 3 species of tree leaves measured | File Name |
| Colophospermum mopane | maun_sp1.csv |
| Grewia flava | maun_sp2.csv |
| Bauhinia petersiana | maun_sp3.csv |
| Okwa Species | |
| 3 species of shrub leaves measured Each one of the species has several leaf samples. Data are average values for each of the species | File Name |
| Terminalia sericea (7 samples) | okwa_sp1.csv |
| Grewia flava (5 samples) | okwa_sp3.csv |
| Bauhinia petersiana (5 samples) | okwa_sp5.csv |
| Tshane Species | |
| 2 species of low tree/shrub leaves measured | File Name |
| Acacia leuderitzii | tshane_sp1.csv |
| Acacia mellifera | tshane_sp2.csv |
| Mongu Species | |
| 4 species of tree leaves and 1 species of shrub leaves measured | File Name |
| Brachystegia spiciformis | mongu_sp1.csv |
| Brachystegia bakeriana | mongu_sp2.csv |
| Burkea africana | mongu_sp3.csv |
| Guibourtia coleosperma | mongu_sp4.csv |
| Copaifera batokana (shrub) | mongu_sp5.csv |
| All 4 tree species (above) | mongu_all_tree_sp.csv |
| Grass Species, All Sites | File Name |
| Unidentified grass species, collected from all sites | all_sites_grass.csv |
| Grass Species, All Sites | File Name |
| Unidentified grass species, collected from all sites | all_sites_grass.csv |
Additional information about the study sites, data acquisition methods, and data format, including sample plots from each site, is found in the companion file: http://daac.ornl.gov/daacdata/safari2k/field_campaign/kt_leaf_spectra/comp/kt_leaf_spectra_readme.pdf.
2004/12/1
2004/12/1
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