The Multi-angle Imaging SpectroRadiometer (MISR) Validation team was deployed to the Sua Pan salt playa in the Magkadigkadi region of Botswana during the SAFARI 2000 Dry Season Aircraft Campaign to collect various data sets for validating the MISR LAI/FPAR algorithm. Ground measurements of leaf area index (LAI) and fraction of absorbed photosynthetically active radiation (FPAR) were made using the LAI-2000 plant canopy analyzer and Sunfleck PAR ceptometer, respectively, during focused periods from August 20 to August 28, 2000, at a dry grassland site adjacent to the Sua Pan. The 1 km by 1 km sampling grid was a homogeneous, relatively dense grassland, with a height of 20-100 cm and two prevalent grass types, Odyssea paucinervis and Sporobolus spicatus. Associated reflectance measurements were made with the PARABOLA and ASD instruments (Helmlinger et al., 2004a; 2004b). Coincident aircraft overflights collected aerial photographs, in-situ aerosol, and BRDF data on selected dates. See Myers (2004), Hobbs (2004), and Piketh et al. (2004a and 2004b) for more information.
The data files contain measurements of LAI and PAR reflectance and transmission and a description of sky conditions during the sampling periods. With one exception, all measurements were made under clear sky conditions. PAR data were measured only on the transect scale while LAI are provided at both pixel and transect scales. PAR readings were performed at 93 transect sample points, and LAI readings were performed at 135 (93 transect and 42 subgrid) sample points. Each file also contains mean LAI and PAR values. The data files are ASCII tables, in comma-separated-value format.
Cite this data set as follows:
Buermann, W. and M. Helmlinger. 2005. SAFARI 2000 LAI and FPAR Measurements at Sua Pan, Botswana, Dry 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/778.
Helmlinger, M., W. Buermann, and F. Eckardt. 2004a. SAFARI 2000 BRDF Measurements at Sua Pan and Skukuza, Dry 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.
Helmlinger, M., W. Buermann, and F. Eckardt. 2004b. SAFARI 2000 Surface Spectral Reflectance at Sua Pan, Botswana, Dry 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.
Hobbs, P. V. 2004. SAFARI 2000 CV-580 Aerosol and Cloud Data, Dry Season 2000 (CARG). Data set. Available on-line [www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.
Myers, J. S. 2004. SAFARI 2000 ER-2 Color-IR Aerial Photography, Dry 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.
Piketh, S. J., T. Elias, and D. C. Stein. 2004a. SAFARI 2000 JRA Aerocommander Trace Gas, Aerosol, and CCN Data, Dry Season 2000. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.
Piketh, S. J., T. Elias, and D. C. Stein. 2004b. SAFARI 2000 JRB Aerocommander Trace Gas and Aerosol Data, Dry Season 2000. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.
Data files contain records of leaf area index (LAI) and ceptometer measurements of photosynthetically active radiation (PAR) reflectance and transmission at a dry grassland site adjacent to the Sua Pan. Each file contains summary information in the top portion, providing mean LAI and PAR values, followed by the data fields described below. PAR data were measured only on the transect scale (see sampling section below) and LAI are provided at both pixel and transect scales. The data files are ASCII tables, in comma-separated-value format.
misr_sua_fpar.csv
| Column Name | Definition | Units/Format |
|---|---|---|
| Date | Date of measurement | DDMMYYYY |
| Time | Time of measurement | local time (hh:mm) |
| Location | Sampling location (transect) | character (letter, number) |
| Incident | Incident PAR | W m-2 |
| Transmission | Transmitted PAR | µmol m-2s-1 |
| Reflectance | PAR reflectance | µmol m-2s-1 |
| Conditions | Sky conditions | character |
| Refl. (norm) | normalized reflectance | % |
| Trans. (norm) | normalized transmittance | % |
misr_sua_lai.csv
| Column Name | Definition | Units/Format |
|---|---|---|
| Location | Sampling location (transect and grid) | character (letter, number) |
| LAI | Leaf Area Index (one-sided green leaf area per unit ground area) | unitless |
| SEL | Standard Error of the LAI Determination | unitless |
| Condition | Sky Conditions | ASCII |
Additional information about the data format, site conditions, instrument descriptions, and sampling and data acquisition methods is found in the companion file: http://daac.ornl.gov/daacdata/safari2k/field_campaign/sua_pan_lai_fpar/comp/sua_pan_lai_fpar_readme.pdf.
2004/10/21
2004/10/21
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