TY  - JOUR
AU  - Ali, Muhammed
AU  - Montzka, Carsten
AU  - Stadler, Anja
AU  - Menz, Gunter
AU  - Thonfeld, Frank
AU  - Vereecken, Harry
TI  - Estimation and Validation of RapidEye-Based Time-Series of Leaf Area Index for Winter Wheat in the Rur Catchment (Germany)
JO  - Remote sensing
VL  - 7
IS  - 3
SN  - 2072-4292
CY  - Basel
PB  - MDPI
M1  - FZJ-2015-01917
SP  - 2808-2831
PY  - 2015
AB  - Leaf Area Index (LAI) is an important variable for numerous processes in various disciplines of bio- and geosciences. In situ measurements are the most accurate source of LAI among the LAI measuring methods, but the in situ measurements have the limitation of being labor intensive and site specific. For spatial-explicit applications (from regional to continental scales), satellite remote sensing is a promising source for obtaining LAI with different spatial resolutions. However, satellite-derived LAI measurements using empirical models require calibration and validation with the in situ measurements. In this study, we attempted to validate a direct LAI retrieval method from remotely sensed images (RapidEye) with in situ LAI (LAIdestr). Remote sensing LAI (LAIrapideye) were derived using different vegetation indices, namely SAVI (Soil Adjusted Vegetation Index) and NDVI (Normalized Difference Vegetation Index). Additionally, applicability of the newly available red-edge band (RE) was also analyzed through Normalized Difference Red-Edge index (NDRE) and Soil Adjusted Red-Edge index (SARE). The LAIrapideye obtained from vegetation indices with red-edge band showed better correlation with LAIdestr (r = 0.88 and Root Mean Square Devation, RMSD = 1.01 & 0.92). This study also investigated the need to apply radiometric/atmospheric correction methods to the time-series of RapidEye Level 3A data prior to LAI estimation. Analysis of the the RapidEye Level 3A data set showed that application of the radiometric/atmospheric correction did not improve correlation of the estimated LAI with in situ LAI.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000353685200023
DO  - DOI:10.3390/rs70302808
UR  - https://juser.fz-juelich.de/record/188562
ER  -