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| AATSR related Articles & Studies available: |
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Scientific papers using AATSR data
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| This document provides a list of scientific literature using ATSR data, including a list of peer-reviewed literature, links to some freely available scientific documents, and links to meetings at which papers or presentations on ATSR are available via the Web.
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| 24/05/2012
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Instrument Pixel Co-ordinates and Measurement Times from AATSR Products
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| Because of the conical scanning geometry of the AATSR instrument, measured AATSR instrument pixels lie on a series of curves defined by the intersection of the scan cone with the surface of the Earth. In order to present the data on a rectangular grid, AATSR Level 1B processing includes a regridding stage in which the measured instrument pixels are relocated by migrating each one to a nearby image position. As a result, the image pixels in the full resolution products ATS_TOA_1P and ATS_NR__2P are displaced slightly from their measured positions. This displacement does not exceed the 1 km resolution of the instrument in either co-ordinate, and so is not significant for the many applications for which the surface is relatively homogeneous. However, for some applications the displacement may be significant.
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| 30/03/2010
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Summary of (A)ATSR Archive QC Results
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| This document presents a summary of the results from the quality control (QC) activities performed by the IDEAS AATSR QC Team on the archive of the reprocessed AATSR data and ATSR-1 and ATSR-2 data in Envisat format.
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| 03/03/2009
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Verification of the BUFR form of the AATSR Meteo Product
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User Note on Meteo Product Comparisons Report
A verification of the BUFR form of the AATSR Meteo product was conducted, in accordance with the AATSR long-term algorithm verification plan. This memo provides a summary of the findings of this report.
Full Verification Report
This document describes the verification applied to the AATSR Meteo product (ATS_MET_AX) in its BUFR form. The BUFR form of the Meteo Product is derived from the PDS form by a format conversion. In principle therefore the contents of the PDS and BUFR forms of the BUFR product should be identical, and the BUFR form of the product can be verified by comparing each data field in turn with the corresponding field in the PDS product from which it was derived.
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| 02/10/2007
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Improvements to the AATSR IPF relating to Land Surface Temperature Retrieval and Cloud Clearing over Land
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This Technical Note describes the improvements to the cloud clearing over land, and the LST algorithm, which were included in IPF v6.0. The information contained in this document is applicable to versions 6.0 or greater of the IPF.
The specific changes to the products are given below. For Level 1B products these are: the implementation of gross cloud test over land; the disabling of spatial coherence test over land, by clearing resulting flag if pixel over land and two new flags in the cloud flag words of the L1B ATS_TOA_1P products, introduced at bits 13 and 14. For Level 2 products these are: flagging of marginal cloud land pixels, where LST retrieved anyway, bit 11 of Level 2 confidence word, previously used for sea pixels only; the flagging of inland lakes, using bit 12 of Level 2 confidence word previously used for sea pixels only and extended land flag (bit 4) [Note: the combined fields contain NDVI for lake pixels], and also the implementation of averaged LST, replacing the 11 micron BT placeholder.
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| 02/10/2007
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AATSR Visible Channel Update Information
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| Studies of the long term stability of the AATSR visible channel calibration have shown that the drift does not follow a linear trend. A further correction is therefore needed to compensate for the deviation from the expected trend. Inspection of the data suggests that the calibration drift may be due to the gradual build up of a thin contaminant film on the optical surfaces of the visible calibration system, rather than by the gradual degradation of the exposed optics. A simple thin film model has been applied to the data that appears to confirm this hypothesis. A new drift correction based on this model is proposed, along with a guide to applying the new correction, in the AATSR Technical Note: Visible Channel Update, D. Smith, January 2006.
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| 01/06/2006
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Latitude Dependent Bias Correction
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| The retrieval errors of the AATSR dual view coefficients were analysed by Andrew Birks at RAL. The coefficients are global and whilst the mean retrieval error over all the atmospheric profiles is zero, if the retrieval errors are plotted according to the latitude of the profile then a variation in the errors appear. This is more pronounced when the 3.7 micron channel is not in use, and so a bias appears between dual-view retrievals using the 3.7 micron channel and those that do not. The derivation and application of the correction for this bias are detailed in the AATSR Technical Note: Latitude Dependent Bias Correction, A. Birks, June 2006.
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| 01/06/2006
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Applying the 1.6 micrometer Nonlinearity Correction to AATSR GBT Products
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| This Technical Note describes the procedure to apply the nonlinearity correction to the 1.6 micrometer reflectances in AATSR GBT L1B products generated before 14 December 2004.
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| 22-12-2004
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