Measuring LAI in Kalahari Woodlands and Savannas Field Protocols and Results

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Measuring LAI in Kalahari Woodlands and
SavannasField Protocols and Results

• Jeffrey L. Privette, NASA
• Gareth Roberts, UCL

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Mongu Tower Kataba Local Forest
SAVE sites
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(No Transcript)
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Mongu Off-tower Measurements
Transects (3 750 m) LAI-2000 (LAI) TRAC
( cover, LAI) Thermal IR (Temp.) Hem.
Photo. ( cover) Soil 1 Heat Flux Plate 8
Soil Moisture TDRs 8 Thermistors
(Temp.) Surface 1 Surface IR (Temp.)
Sunphotometer
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TRAC Transects at Mongu
IKONOS NDVI 4 m/pixel
ETM NDVI 30 m/pixel
Kataba Forest Border
750 m
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Zoom View of Raw TRAC Data
25 m
Max. PPFD
Gap
Crown
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TRAC Data Quality Check
Transect B at Mongu, Zambia June, Aug.,
Sept, and Nov. 2000
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Correlation of TRAC LAI and ETM NDVI on Transect
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IKONOS NDVI vs. Gap Fraction
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MODIS LAI Over Mongu
From Wet Season (April) through Dry Season
(October)
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Field and MODIS Green LAI Comparison
Mean Error - 0.07 Std. Dev. 0.23
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Kalahari Transect Field CampaignMarch 2000
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50 m





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MODIS LAI Test Sites on IGBP Kalahari Transect
Courtesy Y. Tian
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MODIS LAI Assessment Along the Kalahari Transect
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Estimating Canopy Cover with TRAC
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Canopy Variability with Precipitation Along KT
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Kriging Estimate
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Kriging Error