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AATSR Data Formats Products
SST record 50 km cell MDS
BT/TOA Sea record 17 km cell MDS
Vegetation fraction for Land Surface Temperature Retrieval GADS
Topographic Variance data for Land Surface Temperature Retrieval GADS
Land Surface Temperature retrieval coefficients GADS
General Parameters for Land Surface Temperature Retrieval GADS
Climatology Variance Data for Land Surface Temperature Retrieval GADS
Level 0 SPH
Level 0 MDSR
Auxilliary Data SPH with N = 1
1.6 micron nadir view MDS
Summary Quality ADS
Scan pixel x and y ADS
Grid pixel latitude and longtitude topographic corrections ADS
Across-track Band Mapping Look-up Table
Configuration Data GADS
Processor configuration GADS
LST record 50 km cell MDS
Distributed product MDS
Level 2 SPH
10-arcminute mds
Limits GADS
Validation Parameters GADS
BT/TOA Land record 17 km cell MDS
General Parameters GADS
Temperature to Radiance LUT GADS
Radiance to Brightness Temperature LUT GADS
Medium/High Level Test LUT GADS
Infrared Histogram Test LUT GADS
11 Micron Spatial Coherence Test LUT GADS
11/3.7 Micron Nadir/Forward Test LUT GADS
11/12 Micron Nadir/Forward Test LUT GADS
Characterisation GADS
Browse Day_Time Colour LUT GADS
Browse SPH
Grid pixel latitude and longtitude topographic correction ADS
Level 2 SPH
Auxilliary Products
ATS_VC1_AX: Visible Calibration data
ATS_SST_AX: SST Retrieval Coeficients data
ATS_PC1_AX: Level-1B Processing configuration data
ATS_INS_AX: AATSR Instrument data
ATS_GC1_AX: General Calibration data
ATS_CH1_AX: Level-1B Characterization data
ATS_BRW_AX: Browse Product LUT data
Level 0 Products
ATS_NL__0P: AATSR Level 0 product
Browse Products
ATS_AST_BP: AATSR browse image
Level 1 Products
ATS_TOA_1P: AATSR Gridded brightness temperature and reflectance
Level 2 Products
ATS_NR__2P: AATSR geophysical product (full resolution)
ATS_MET_2P: AATSR Spatially Averaged Sea Surface Temperature for Meteo Users
ATS_AR__2P: AATSR averaged geophysical product
Frequently Asked Questions
The AATSR Instrument
Instrument Characteristics and Performance
In-flight performance verification
Instrument Description
Internal Data Flow
Instrument Functionality
AATSR Products and Algorithms
Common Auxiliary data sets
Auxiliary Data Sets for Level 2 processing
Instrument Specific Topics
Level 2 Products
Level 1B Products and Algorithms
Level 1B Products
Instrument Pixel Geolocation
The Level 0 Product
Differences Between ATSR-2 and AATSR Source Packets
Definitions and Conventions
Organisation of Products
Relationship Between AATSR and ATSR Products
AATSR Product Organisation
Data Handling Cookbook
Characterisation and Calibration
Monitoring of AATSR VISCAL Parameters
Latency, Throughput and Data Volume
Data Processing Software
Data Processing Centres
The AATSR Products User Guide
Image Gallery
Breakup of the Ross Ice Shelf
Land cover in the Middle East
Typhoon Saomai
Mutsu Bay, Japan
Deforestation in Brazil
Spatially Averaged Global SST, September 1993
Further Reading
How to use AATSR data
Why Choose AATSR Data?
Why Choose AATSR Data?
Special Features of AATSR
Principles of Measurement
Scientific Background
The AATSR Handbook
SST record 17 km cell MDS
Surface Vegetation class for Land Surface Temperature Retrieval GADS
1.6 micron forward view MDS
12 micron nadir view MDS
12 micron forward view MDS
Summary Quality ADS
Surveillance Limits GADS
Master Unpacking Definition Table GADS
1.6 micron Non-Linearity Correction LUT GADS
General Parameters GADS
Thin Cirrus Test LUT GADS
Fog/low Stratus Test LUT GADS
1.6 Micron Histogram
Browse MDS
ATS_CL1_AX: Cloud LUT data
Pre-flight characteristics and expected performance
Payload description, position on the platform
Auxiliary products
Auxiliary Data Sets for Level 1B processing
Summary of auxiliary data sets
Calculate Solar Angles
Image Pixel Geolocation
Level 0 Products
Acquisition and On-Board Data Processing
Product Evolution History
Hints and Algorithms for Higher Level Processing
Data Volume
Software tools
Summary of Applications vs Products
Geophysical Coverage
Geophysical Measurements
Visible calibration coefficients GADS
Level 1B SPH
LST record 17 km cell MDS
Conversion Parameters GADS
12 Micron Gross Cloud Test LUT GADS
ATS_PC2_AX: Level-2 Processor Configuration data
Level 2 Products
Hints and Algorithms for Data Use
BT/TOA Sea record 50 km cell MDS
BT/TOA Land record 50 km cell MDS
Level 2 Algorithms
Signal Calibration
Site Map
Frequently asked questions
Terms of use
Contact us


2.2.2 AATSR Product Organisation

The AATSR products available from the PDS and their respective processing levels are summarised in table 2.1 .

Table 2.1 AATSR Products and Processing Levels
Level Product Product ID Contents
0 Level 0 ATS_NL_0P Instrument Source Packets
1B Gridded Brightness Temperature/Reflectance Product (GBTR) ATS_TOA_1P Full (1 km) resolution TOA BT/reflectance for all channels and both views
1B Browse Product ATS_AST_BP 3 band colour composite image derived from nadir only GBTR product, 4 x 4 km sampling
2 Gridded Surface Temperature Product (GST) ATS_NR_2P Full (1 km) resolution geophysical parameters over sea, land and cloud
2 Averaged Surface Temperature (AST) ATS_AR_2P Spatially averaged ocean, land and cloud parameters, plus spatially averaged BT/reflectance
Averaged over 10 and 30 arc minute and 17 and 50 km cells
2 Meteo Product ATS_MET_2P SST and averaged BT for all clear pixels in 10 arc min cells

Product sizes and processing latency are discussed in section 2.10. .

The AATSR Prototype Processor (PP) operated by DEFRA also generates two internal products (table 2.2 ) mid-way through the L1b processing. These are not official ESA products and are not available through the PDS. These products are principally used by the instrument science and engineering teams to monitor instrument performance and internal data processing parameters.

Table 2.2 AATSR Internal Ungridded Products
Level Product Product ID Contents
1 Ungridded Counts
N/A Unpacked raw detector counts in each channel, plus calibration data and auxiliary telemetry
1 Ungridded BT/Reflectance
N/A Calibrated measurement data in instrument scan geometry, plus target lat/long and ground track x/y coordinates for each pixel

AATSR products are of two types: full resolution products, and averaged products. The full resolution products are image products based on a rectangular grid of 1 km nominal resolution, centered on the satellite ground track. Because of the conical scanning geometry of AATSR, the pixels measured by the instrument fall on curved scan lines, and must be re-sampled onto a rectangular grid.

This is done by migrating each pixel to the nearest grid point. This process will not completely account for every grid point, since in some parts of the scan the density of measured scan pixels is lower than the grid point density, so to allow for this a cosmetic fill operation is then carried out. The net result is that each MDS pixel is a measured scan pixel, but displaced in position. If a pixel within the grid has been cosmetically filled, this is indicated in the corresponding confidence word, in which bit 1 will be set.

Averaged quantities in the AST product are provided at two different resolutions, and with respect to two different averaging schemes as described in Section (Half-Degree cells) and Section (50 km cells)

Averaged brightness temperatures and reflectances are generated from the Level 1B regridded brightness temperatures and visible channel reflectances. Two different averaging schemes are used. For the first of these, the globe is imagined to be divided into cells 0.5° in latitude by 0.5° in longitude, and these cells are further subdivided into 9 sub-cells extending 10 arcmin in latitude by 10 arcmin in longitude. Averaged brightness temperatures and reflectances are derived, for cloud-free and cloudy pixels separately, by averaging the data over these cells and sub-cells.

Each cell is further subdivided into 9 sub-cells each extending 10 arc minutes in latitude by 10 arc minutes in longitude. Similar spatially averaged quantities, averaged over cells and sub-cells of nominal dimensions 50 km by 50 km and 17 km by 17 km respectively, are derived to give an alternative averaged product based on equal area cells.

All archived AATSR products will be orbit-based (unlike full resolution ATSR-2 products, which are scene based) and will conform to the common ENVISAT product structure described above. The data sets may include both Measurement Data Sets (MDS), containing instrument data, and Annotation Data Sets (ADS), containing auxiliary data. An AATSR product data set record corresponds to an across-track image row in the full resolution products, or to a cell in the Level 2 averaged product.