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TIMELINE 1-km AVHRR basis parameters: reflectance, clouds, LST

Frey, Corinne and Klüser, Lars and Gesell, Gerhard and Bachmann, Martin (2016) TIMELINE 1-km AVHRR basis parameters: reflectance, clouds, LST. 36th EARSeL Symposium, 20.-24. Jun. 2016, Bonn, Deutschland.

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Abstract

In order to re-process DLRs 1km AVHRR data archive to different geophysical and descriptive parameters of the land surface and the atmosphere, a series of scientific data processors are being developed in the framework of the TIMELINE project. The archive of DLR ranges back to the 80ies. The data is preprocessed to L1b and harmonized for sensor effects. The detection of clouds and the processing of cloud properties are done using APOLLO_NG (APOLLO_NextGeneration), which is a probabilistic interpretation of the classical APOLLO scheme, building on its physical principles. Cloud detection is expressed as cloud probability for each satellite pixel. Furthermore, the probabilistic approach of APOLLO_NG allows the retrieval of cloud properties (optical depth, effective radius, cloud top temperature and cloud water path) along with their uncertainties. The radiative transfer solution is approximated by a two-stream approach, which allows the online calculation of the radiative transfer. Further processing of the visible bands includes the TAC (TIMELINE Atmospheric Correction) step, in which atmospheric correction is done on the basis of LUTs. BRDF is corrected using a temporal moving window approach. The thermal bands of the L1b product are used for LST estimation with SurfTemp. Its development included the selection of statistical procedures suitable for time series processing. In a round robin approach, the selected algorithms are tested on the basis of a large number of TOA radiance/LST pairs, which were generated using a radiative transfer model and the SeeBorV5 profile database. The algorithm comparison includes measures of precision, as well as the sensitivity of a method to the accuracy of its input data. Besides the implementation into SurfTemp, first cross-validation results between the AVHRR LST and MODIS LST are shown.

Item URL in elib:https://elib.dlr.de/107610/
Document Type:Conference or Workshop Item (Speech)
Title:TIMELINE 1-km AVHRR basis parameters: reflectance, clouds, LST
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Frey, Corinnecorinne.frey (at) dlr.deUNSPECIFIED
Klüser, Larslars.klueser (at) dlr.deUNSPECIFIED
Gesell, Gerhardgerhard.gesell (at) dlr.deUNSPECIFIED
Bachmann, Martinmartin.bachmann (at) dlr.deUNSPECIFIED
Date:June 2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:TIMELINE, AVHRR, LST, atmospheric correction, TAC, BRDF, Clouds
Event Title:36th EARSeL Symposium
Event Location:Bonn, Deutschland
Event Type:international Conference
Event Dates:20.-24. Jun. 2016
Organizer:EARSeL
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
Deposited By: Frey, Dr. Corinne
Deposited On:23 Nov 2016 12:42
Last Modified:16 Feb 2017 09:16

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