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Global Gap-Free MERIS LAI Time Series (2002-2012)

Tum, Markus and Günther, Kurt P. and Böttcher, Martin and Baret, Frederic and Bittner, Michael and Brockmann, Carsten and Weiss, Marie (2016) Global Gap-Free MERIS LAI Time Series (2002-2012). Remote Sensing, 8 (69), pp. 1-19. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/rs8010069 ISSN 2072-4292

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Abstract

This article describes the principles used to generate global gap-free Leaf Area Index (LAI) time series from 2002–2012, based on MERIS (MEdium Resolution Imaging Spectrometer) full-resolution Level1B data. It is produced as a series of 10-day composites in geographic projection at 300-m spatial resolution. The processing chain comprises geometric correction, radiometric correction, pixel identification, LAI calculation with the BEAM (Basic ERS & Envisat (A)ATSR and MERIS Toolbox) MERIS vegetation processor, re-projection to a global grid and temporal aggregation selecting the measurement closest to the mean value. After the LAI pre-processing, we applied time series analysis to fill data gaps and to filter outliers using the technique of harmonic analysis (HA) in combination with mean annual and multiannual phenological data. Data gaps are caused by clouds, sensor limitations due to the solar zenith angle (<10°), topography and intermittent data reception. We applied our technique for the whole period of observation (July 2002–March 2012). Validation, carried out with VALERI (Validation of Land European Remote Sensing Instruments) and BigFoot data, revealed a high degree (R2: 0.88) of agreement on a global scale.

Item URL in elib:https://elib.dlr.de/102590/
Document Type:Article
Title:Global Gap-Free MERIS LAI Time Series (2002-2012)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Tum, Markusmarkus.tum (at) dlr.deUNSPECIFIED
Günther, Kurt P.kurt.guenther (at) dlr.deUNSPECIFIED
Böttcher, Martinmartin.boettcher (at) brockmann-consult.deUNSPECIFIED
Baret, FredericInstitut National de la Recherche Agronomique, AvignonUNSPECIFIED
Bittner, Michaelmichael.bittner (at) dlr.deUNSPECIFIED
Brockmann, CarstenBrockmann-ConsultUNSPECIFIED
Weiss, Mariemarie.weiss (at) avignon.inra.frUNSPECIFIED
Date:15 January 2016
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:8
DOI :10.3390/rs8010069
Page Range:pp. 1-19
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2072-4292
Status:Published
Keywords:Leaf Area Index; MERIS; time series analysis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Fernerkundung der Landoberfläche (old)
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface
German Remote Sensing Data Center > Atmosphere
Deposited By: Tum, Markus
Deposited On:29 Jan 2016 11:18
Last Modified:08 Mar 2018 18:50

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