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Remote Sens. 2016, 8(4), 310;

Scaling of FAPAR from the Field to the Satellite

State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing 100875, China
National Marine Data & Information Service, Tianjin 300171, China
Navy Press, Tianjin 300450, China
ICube Laboratory, UMR 7357 CNRS-University of Strasbourg, Illkirch 67412, France
Author to whom correspondence should be addressed.
Academic Editors: Xin Li, Yuei-An Liou, Qinhuo Liu, Clement Atzberger and Prasad S. Thenkabail
Received: 13 October 2015 / Revised: 27 March 2016 / Accepted: 29 March 2016 / Published: 7 April 2016
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The fraction of absorbed photosynthetically active radiation (FAPAR) is a critical biophysical parameter in eco-environmental studies. Scaling of FAPAR from the field observation to the satellite pixel is essential for validating remote sensing FAPAR product and for further modeling applications. However, compared to spatial mismatches, few studies have considered temporal mismatches between in-situ and satellite observations in the scaling. This paper proposed a general methodology for scaling FAPAR from the field to the satellite pixel considering the temporal variation. Firstly, a temporal normalization method was proposed to normalize the in-situ data measured at different times to the time of satellite overpass. The method was derived from the integration of an atmospheric radiative transfer model (6S) and a FAPAR analytical model (FAPAR-P), which can characterize the diurnal variations of FAPAR comprehensively. Secondly, the logistic model, which derives smooth and consistent temporal profile for vegetation growth, was used to interpolate the in-situ data to match the dates of satellite acquisitions. Thirdly, fine-resolution FAPAR products at different dates were estimated from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data using the temporally corrected in-situ data. Finally, fine-resolution FAPAR were taken as reference datasets and aggregated to coarse resolution, which were further compared to the Moderate Resolution Imaging Spectroradiometer (MODIS) FAPAR product. The methodology is validated for scaling FAPAR from the field to the satellite pixel temporally and spatially. The MODIS FAPAR manifested a good consistency with the aggregated FAPAR with R2 of 0.922 and the root mean squared error of 0.054. View Full-Text
Keywords: fraction of absorbed photosynthetically active radiation; scaling; validation; MODIS; in-situ data; coarse resolution fraction of absorbed photosynthetically active radiation; scaling; validation; MODIS; in-situ data; coarse resolution

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Wang, Y.; Xie, D.; Liu, S.; Hu, R.; Li, Y.; Yan, G. Scaling of FAPAR from the Field to the Satellite. Remote Sens. 2016, 8, 310.

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