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SST record 50 km cell MDS
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ATS_TOA_1P_MDSR_conf
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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
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ATS_TOA_1P: AATSR Gridded brightness temperature and reflectance
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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
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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
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1.6 Micron Histogram
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ATS_CL1_AX: Cloud LUT data
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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
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BT/TOA Sea record 50 km cell MDS
BT/TOA Land record 50 km cell MDS
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6.6.4 LST record 50 km cell MDS

Table 6.26 LST record 50 km cell MDS

LST record 30 arc minute cell MDS

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

The (nadir and forward view) instrument data contributing to a given cell or sub-cell may cover a range of up to 150 seconds of measurement times. It is therefore not possible to assign a unique time tag to an AST record, and the time tag is therefore arbitrarily assigned as follows. The ��nadir time�� associated with a given AST record represents the scan time of a nadir pixel contributing to the record. In general this is the time of the first filled pixel encountered during processing that falls within the geometrical boundary of the cell or sub-cell (see link), although exception cases may arise. Because the cell boundaries bear no clear geometrical relationship to the AATSR instrument scan it is not possible to state in general that this corresponds to a particular corner of the cell or sub-cell. Note also that if a cell is intersected by coastline, so that it contains both land and sea pixels, the time tag of a given record does not necessarily correspond to a pixel of the same surface type.

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

This field is set to -1 if all the measurement values in the record are invalid, and is set to 0 otherwise.

flag 1 BooleanFlag 1 byte(s)
2 spare_1
Spare
- 1 SpareField 3 byte(s)
3 lat
Latitude of cell

The latitude of the lower left-hand corner of the cell, in units of micro-degrees. The latitude is defined in the range -90 degrees to +90 degrees. [If the cell contains no valid data, this field may be set to the exceptional value -399,999,999.?? This case may not arise for the full cell.]

(1e-6) degrees 1 GeoCoordinate 4 byte(s)
4 lon
Longitude of cell

The longitude of the lower left-hand corner of the cell, in units of micro-degrees. The longitude is defined in the range -180 degrees to +180 degrees.

(1e-6) degrees 1 GeoCoordinate 4 byte(s)
5 m_actrk_pix_num
Mean across-track pixel number

A weighted mean pixel index of the nadir view clear land pixels that fall within the cell and contribute to the average. This quantity is derived by averaging the mean across-track pixel number (q.v.) over those sub-cells which contain sufficient valid pixels to contribute to the averaged LST in the cell.

- 1 ss 2 byte(s)
6 m_lst
mean land surface temperature (ST)

The mean land surface temperature (LST) for the cell derived using only data in the nadir view. It is derived by averaging the mean nadir-only LST (q.v.) for each of the (up to) 9 sub-cells that fall within the cell and that contain more than a minimum number of valid clear sea pixels. If none of the contributing sub-cells contains sufficient valid pixels, the field is set to the exceptional value -1.

K/100 1 ss 2 byte(s)
7 sd_lst
standard deviation of land ST

The standard deviation of the mean nadir-only LST of the contributing sub-cells.

K/100 1 ss 2 byte(s)
8 pix_lst
Number of pixels in land surface temperature average

The number of valid 11 and 12 micron pixels contributing to the ABT determination in the cell. This will usually be the same as the number of valid 11 and 12 micron pixels contributing to the mean nadir-only LST determination in the cell, although if any sub-cells contain too few valid pixels to contribute to the averaged LST, the numbers may differ. In general the numbers of valid pixels in the 11 and 12 micron channels are expected to be the same; if they differ, the lower is given here.

- 1 us 2 byte(s)
9 m_ndvi
mean NDVI

The mean Normalised Difference Vegetation Index (NDVI) for the cell derived using data from both nadir and forward views. It is derived by averaging the sub-cell NDVI (q.v.) for each of the (up to) 9 sub-cells that fall within the cell and that contain more than a minimum number of valid clear land pixels. If none of the contributing sub-cells contains sufficient valid pixels, the field is set to the exceptional value -1.

- 1 ss 2 byte(s)
10 sd_ndvi
standard deviation of NDVI

The standard deviation of the mean NDVI of the contributing sub-cells.

- 1 ss 2 byte(s)
11 pix_ndvi
Number of pixels in NDVI average

The number of valid 0.87 and 0.67 micron pixels contributing to the ABT determination in the cell. This will usually be the same as the number of valid pixels contributing to the mean NDVI determination in the cell, although if any sub-cells contain too few valid pixels to contribute to the NDVI, these numbers may differ. The numbers of valid pixels in the different channel and view combinations are not necessarily equal. When they differ, the lowest is given here.

- 1 us 2 byte(s)
12 ast_conf_flags
AST confidence word

A 16-bit word containing confidence flags for the record. The detailed interpretation of these bits is defined in the table below. Bits 4 to 31 are currently unused.

flags 2 us 2*2 byte(s)
13 cl_top_temp_nad
Cloud-top temperature, nadir view

An estimate of the cloud-top temperature in the half-degree cell. This estimate is derived by generating a histogram of the 11 micron brightness temperatures of cloudy land pixels within the cell in the nadir view, and averaging the brightness temperatures of the lowest quartile. The estimate is derived from land pixels only.

K/100 1 ss 2 byte(s)
14 perc_cl_cov_nad
Percentage cloud-cover, nadir view

The fraction of nadir view land pixels within the cell that are cloudy, expressed as a percentage in units of 0.01%.

%/100 1 ss 2 byte(s)
15 cl_top_temp_for
Cloud-top temperature, forward view

An estimate of the cloud-top temperature in the half-degree cell. This estimate is derived by generating a histogram of the 11 micron brightness temperatures of cloudy land pixels within the cell in the forward view, and averaging the brightness temperatures of the lowest quartile. The estimate is derived from land pixels only.

K/100 1 ss 2 byte(s)
16 perc_cl_cov_for
Percentage cloud-cover, forward view

The fraction of forward view land pixels within the cell that are cloudy, expressed as a percentage in units of 0.01%.

%/100 1 ss 2 byte(s)
Record Length : 50

DS_NAME : LST record 30 arc minute cell MDS



Format Version 114.0  

The table below lists the confidence flags in the AST Confidence Word.

Table 6.27

bit

meaning if set.

0

Sea MDS: Nadir-only SST retrieval used 3.7 micron channel

Land MDS: Reserved

1

Sea MDS: Dual-view SST retrieval used 3.7 micron channel

Land MDS: Reserved

2

Nadir view contains day-time data

3

Forward view contains day-time data

4 - 31

Unused



AST confidence word