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AVHRR re-processing over Europe and North Africa

Frey, Corinne and Dietz, Andreas and Bachmann, Martin and Bernhard, Eva-Maria and Ruppert, Thomas and Künzer, Claudia and Müller, Andreas and Dech, Stefan (2015) AVHRR re-processing over Europe and North Africa. 36th International Symposium on Remote Sensing of Environment, 2015-05-11 - 2015-05-15, Berlin, Deutschland.

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TIMELINE is a project of the German Remote Sensing Data Center (DFD) of the German Aerospace Center (DLR) and aims in a full re-processing of all available 1km AVHRR data over Europe and North Africa since the 80ies to offer homogeneous time series of land and atmosphere parameters. Due to imprecise geolocation and missing (shortwave) or problematic (longwave) calibration facilities on-board NOAA-satellites a complex pre-processing scheme is being developed. This includes the filtering of data errors (pixel and line based), precise navigation using a two-step chip matching algorithm, orthorectification of the data accounting for surface height, and a harmonizing calibration effort using the spectral information from pseudo-invariant sites. Resulting harmonized L1b dataset will be used for further higher level processing. Basis for the derivation of many land products is a solid atmospheric correction. An atmospheric correction tool TAC using look-up tables is being developed for this task. While the physics behind atmospheric correction is well-known, appropriate input data is a real challenge, especially concerning aerosol types and aerosol optical depth. The lack of such information especially in the early years, and the difficulty in retrieving the information from AVHRR data itself, results in unavoidable uncertainties for the whole time series. Cloud clearing is done using an updated version of the DLR tool Apollo including additional cloud tests. Further products which are under development are Albedo, LST, Snow cover, Vegetation indices, Hot spots, Water masks, and Cloud physical properties. The TIMELINE data policy is free and open, time series download will be available through DLR servers upon completion of the operations. This presentation will inform about the current state of the pre-processing and give insight into current development activities and first results concerning the higher level products.

Item URL in elib:https://elib.dlr.de/95809/
Document Type:Conference or Workshop Item (Speech)
Title:AVHRR re-processing over Europe and North Africa
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Frey, CorinneUNSPECIFIEDhttps://orcid.org/0000-0002-9879-9732UNSPECIFIED
Bachmann, MartinUNSPECIFIEDhttps://orcid.org/0000-0001-8381-7662UNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:AVHRR, reprocessing, Europe
Event Title:36th International Symposium on Remote Sensing of Environment
Event Location:Berlin, Deutschland
Event Type:international Conference
Event Start Date:11 May 2015
Event End Date:15 May 2015
Organizer:International Society for Photogrammetry and Remote Sensing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
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:19 Jun 2015 12:56
Last Modified:24 Apr 2024 20:01

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