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Open Access item Effects of canopy LAI, crown coverage, and view angle on retrieval of leaf chlorophyll content in forest canopies
Miller, J. R.
Goel, N. S.
Zarco-Tejada, Pablo J.
|Keywords:||Chlorophyll Content, Forest Canopies|
|Abstract:||In this study, we used simulated data created by SPRINT and PROSPECT to investigate
issues on retrieval of leaf Chlorophyll content in sugar maple canopies. Two optical
indices, the reflectance index R750/R710 and the derivative index D715/D710, were
employed. As anticipated, these two indices have strong correlation with Chlorophyll
content with R2 over 0.99 at leaf level. At canopy level, for nadir observations, the
correlation between the derivative index and leaf Chlorophyll content is 0.96 for canopies
with crown coverage of 90, 75, 50 and 25 percent and canopy LAI of 4, while the
correlation between the reflectance index and leaf Chlorophyll content is 0.50. Our
results also show that the relationship between the derivative index and leaf Chlorophyll
content derived from closed canopies can be used to predict the leaf Chlorophyll content
for open canopies even for crown coverage of 25 percent with RMSE of 6.3 mg/cm2.
However, with the reflectance index, RMSE increases to over 15 mg/cm2 when the
relationship between the reflectance index and leaf Chlorophyll content is used for open
canopies with crown coverage of 50 percent or less.|
|Description:||Presented at the International Symposium of Spectral Sensing Research (ISSSR), Quebec Cityg (Canada), June 10th-15th, 2001.|
|Appears in Collections:||(IAS) Comunicaciones congresos|
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