Validation of MODIS and GEOV1 fPAR Products in a Boreal Forest Site in Finland

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http://hdl.handle.net/10138/159391

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Majasalmi , T , Rautiainen , M , Stenberg , P & Manninen , T 2015 , ' Validation of MODIS and GEOV1 fPAR Products in a Boreal Forest Site in Finland ' , Remote Sensing , vol. 7 , no. 2 , pp. 1359-1379 . https://doi.org/10.3390/rs70201359

Title: Validation of MODIS and GEOV1 fPAR Products in a Boreal Forest Site in Finland
Author: Majasalmi, Titta; Rautiainen, Miina; Stenberg, Pauline; Manninen, Terhikki
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
Date: 2015
Language: eng
Number of pages: 21
Belongs to series: Remote Sensing
ISSN: 2072-4292
URI: http://hdl.handle.net/10138/159391
Abstract: Remote sensing of the fraction of absorbed Photosynthetically Active Radiation (fPAR) has become a timely option to monitor forest productivity. However, only a few studies have had ground reference fPAR datasets containing both forest canopy and understory fPAR from boreal forests for the validation of satellite products. The aim of this paper was to assess the performance of two currently available satellite-based fPAR products: MODIS fPAR (MOD15A2, C5) and GEOV1 fPAR (g2_BIOPAR_FAPAR), as well as an NDVI-fPAR relationship applied to the MODIS surface reflectance product and a Landsat 8 image, in a boreal forest site in Finland. Our study area covered 16 km(2) and field data were collected from 307 forest plots. For all plots, we obtained both forest canopy fPAR and understory fPAR. The ground reference total fPAR agreed better with GEOV1 fPAR than with MODIS fPAR, which showed much more temporal variation during the peak-season than GEOV1 fPAR. At the chosen intercomparison date in peak growing season, MODIS NDVI based fPAR estimates were similar to GEOV1 fPAR, and produced on average 0.01 fPAR units smaller fPAR estimates than ground reference total fPAR. MODIS fPAR and Landsat 8 NDVI based fPAR estimates were similar to forest canopy fPAR.
Subject: PHOTOSYNTHETICALLY ACTIVE RADIATION
ESSENTIAL CLIMATE VARIABLES
LEAF-AREA INDEX
FAPAR PRODUCTS
ABSORBED PAR
LAI
FRACTION
REFLECTANCE
RETRIEVAL
CANOPIES
4112 Forestry
1171 Geosciences
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