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    24-Jul-2014
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SST record 50 km cell MDS
BT/TOA Sea record 17 km cell MDS
ATS_TOA_1P_MDSR_conf
ATS_TOA_1P_MDSR_cl
ATS_TOA_1P_ADSR_pix
ATS_SST_AX_GADSR
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
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
Algorithms
Instrument Pixel Geolocation
Availability
The Level 0 Product
Differences Between ATSR-2 and AATSR Source Packets
Definitions and Conventions
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
Throughput
Introduction
Heritage
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
Glossary
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
ATS_TOA_1P_ADSR_sa
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
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2.2 Organisation of Products

2.2.1 ENVISAT Product Organisation

ENVISAT PDS files fall into the following 5 distinct classes:

  • Level 0 products - raw data source packets from the satellite, wrapped in a PDS-compatible file structure;
  • Level 1B products - calibrated and geolocated engineering units, with auxiliary data separated from measurements;
  • Level 2 products - geolocated geophysical products in which L1B data has been transformed through higher-level processing into geophysical quantities;
  • Browse products - low resolution overviews of L1B or L2 image products provided for catalogue browsing;
  • Auxiliary products - external data used at various stages of the ground processing, including instrument characterisation measurements, calibration settings and meteorological and orbit predictions.

The naming convention for ENVISAT products is summarised as follows.

filename = <product_ID> <processing_stage_flag> <originator_ID><start_day> <"_"> <start_time> <"_"> <duration> <phase> <cycle> <"_"> <relative_orbit> <"_"> <absolute_orbit> <"_"><counter> <"."> <satellite_ID> <.extension>

These fields are described in detail below, with reference to the following example AATSR file:

ATS_MET_2PNPDK20050301_094558_000066812035_00108_15693_2654.N1.gz

Product ID (ATS_MET_2P)

10 character string identifying sensor, processing level and type of product (P = parent, C = child).

Processing Stage Flag (N)

Set to "N" for Near Real Time product

Set to "V" for fully validated (consolidated) product

Set to "T" for test product

Set to "S" for a special product.

Letters between N and V are assigned in order of level of consolidation (i.e., closer to V = better consolidated)

Originator ID (PDK)

Identifies the centre that generated the file. The 3-character code may be one of the following:

PDK = PDHS-K

PDE = PDHS-E

LRA = LRAC

PDC = PDCC

FOS = FOS-ES

PDA = PDAS-F

U-P = UK-PAC

D-P = D-PAC

I-P = I-PAC

F-P = F-PAC

S-P = S-PAC

E-P = E-PAC

ECM = ECMWF

Start Day (20050301)

The start day of the product from the UTC time of the first DSR. The format is YYYYMMDD.

Start Time (094558)

The start time of the product from the UTC time of the first DSR. The format is HHMMSS.

Duration (00006681)

Time coverage of the product expressed in seconds. If the duration of a product is not relevant information, it will be set to "00000000".

Phase (2)

Mission phase identifier.

Cycle (035)

Cycle number within the mission phase.

Relative Orbit (00108)

Relative orbit number within the cycle at the beginning of the product.

Absolute Orbit (15693)

Absolute orbit at the beginning of the product.

Counter (2654)

Numerical wrap-around counter for quick file identification. For a given product type the counter is incremented by 1 for each new product generated by the product originator.

Satellite ID (.N1)

E1 = ERS-1, E2 = ERS-2, N1 = ENVISAT-1

Extension(.gz)

Optional field. Used only for distribution to users to indicate common archiving and compression standards if used (e.g., .gz, .Z,.tar, .tarZ, .gif, .jpeg, etc.).

All products in the above categories conform to the following structure:

  • A Main Product Header (MPH);
  • A Specific Product Header (SPH), including a number of Data Set Descriptors (DSDs) which provide a directory of the remaining data sets in the file;
  • Measurements Data Sets (MDS);
  • Annotation Data Sets (ADS);
  • Global Annotation Data Sets (GADS).

The format of the MPH is identical for all products. The SPH is specific to each product or group of related products. The MPH and SPH are written in plain ASCII text. The rest of the file is in binary format, except for a few products (none from AATSR) that also have ASCII ADS or MDS.

Each MDS, ADS or GADS consists of a sequence of data set records, containing one or more fields of data. The format of all data sets for all instruments is described in the ENVISAT Product Specifications document (PO-RS-MDA-GS-2009) Ref. [1.8 ] and can also be displayed via EnviView.

A MDS contains data derived from instrument measurements and related processing or instrument information. Every MDS has a time stamp indication the time of the measurement. An ADS contains processing information related to measurements such as geolocation, or quality parameters, and is also time-stamped with the time of the related measurements. The GADS contain processing configuration data that apply to the entire product and are not related to individual measurements, and hence have no time stamp.