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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
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6.6.47 12 micron nadir view MDS

Table 6.79 12 micron nadir view MDS

3.7 micron nadir view MDS

# Description Units Count Type Size
Data Record
0 dsr_time
Nadir UTC time in MJD format

The ��nadir time�� associated with a given record, or image row, is the time at which the sub-satellite point intersects the image row, or the time at which the satellite is vertically overhead at the centre of the row. It corresponds to the measurement time at which the pixels in the centre of the row (the nadir pixels) are measured. Because of the curvature of the instrument scans, the measurement time at the extremities of the row may differ from the nadir time by up to 15 seconds. Similarly the measurement time of a forward view image will differ by approximately 135 seconds (2.25 minutes) from the measurement time of the corresponding nadir scan. The relationship between nadir time and measurement time is explained in more detail in the accompanying link.

MJD 1 mjd 12 byte(s)
1 quality_flag
Quality Indicator (-1 for blank MDSR, 0 otherwise)

The record quality indicator is set to -1 to indicate a blank MDS Record, to zero otherwise (I.e. if the record contains valid data).

flag 1 BooleanFlag 1 byte(s)
2 spare_1
- 1 SpareField 3 byte(s)
3 img_scan_y
image scan y coordinate

The y co-ordinate of the image row (or image scan), in units of metres. Because the AATSR image data is sampled at equal intervals of time in the along track direction, this quantity is provided in order to define the relationship between time and image scale. The y co-ordinate is measured along the satellite ground track; the origin (in the case of consolidated data) is at the ascending node of the orbit. (Precisely, from the point corresponding to time T0, however defined.) The co-ordinate frame of the AATSR images is defined in the accompanying link.

m 1 sl 4 byte(s)
4 bt_rad_pix
BT or reflectance for pixel 0 - 511(Units are K/100 for BT, %/100 for reflectance).

The calibrated brightness temperature of each pixel on the image row (numbers 0 to 511) in the appropriate infra-red channel, measured in the nadir view. The brightness temperature is expressed as a 16 bit integer in units of 0.01 K. Valid brightness temperatures will be positive numbers in the range 17,000 to 32,100, but in the event that a valid BT is not available, the field will be set to an exceptional value that is a small negative integer. The exceptional values are tabulated and explained below.

K/100 512 ss 512*2 byte(s)
Record Length : 1044

DS_NAME : 3.7 micron nadir view MDS

Format Version 114.0  
The following table shows the pixel exceptional values and the corresponding flag bits in the confidence word.
Table 6.80 Pixel exception values in GBTR MDS #1 to MDS #14.

Exception Value


Confidence word bit


Scan Absent (null packet)



Pixel Absent



Not decompressed



No signal in channel



Saturation in channel



Derived radiance outside Calibration



Calibration Parameters unavailable



Unfilled Pixel (set in cosmetic fill)