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Vegetation fraction for Land Surface Temperature Retrieval GADS
Topographic Variance data for Land Surface Temperature Retrieval GADS
Land Surface Temperature retrieval coefficients GADS
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Climatology Variance Data for Land Surface Temperature Retrieval GADS
Level 0 SPH
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1.6 micron nadir view MDS
Summary Quality ADS
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LST record 50 km cell MDS
Distributed product MDS
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BT/TOA Land record 17 km cell MDS
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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
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11/12 Micron Nadir/Forward Test LUT GADS
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ATS_VC1_AX: Visible Calibration data
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ATS_NL__0P: AATSR Level 0 product
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ATS_TOA_1P: AATSR Gridded brightness temperature and reflectance
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SST record 17 km cell MDS
Surface Vegetation class for Land Surface Temperature Retrieval GADS
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LST record 17 km cell MDS
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6.6.39 Distributed product MDS

Table 6.68 Distributed product MDS

Distributed product 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
Spare
- 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 conf_wd_flags
confidence words (Defined in Table 7.5.1.7.8 3)

A 16 bit confidence word for each pixel (number 0 to 511) in the image row. Each bit of the confidence word is a flag that if set indicates a status or exception condition associated with the corresponding pixel. The meanings of the flags are tabulated below. Bits 4, 5, and 8 are of particular importance; bit 4, if set, indicates that the pixel is over land, and bits 5 and 8 , if set, indicate that the pixel is flagged as cloudy in the nadir and forward views respectively. The interpretation of the following fields depends on these bits.

flags 512 us 512*2 byte(s)
5 nad_field
nadir field (Note 1)

The GSST product is described as a ��switchable distributed product��, which means that the information supplied for each pixel depends on the surface type of the pixel, and on whether or not it is cloudy. These fields contain a value for each pixel (0 to 511); the interpretation of the value depends on the cloud and land flags in the corresponding confidence word. If the pixel is a clear sea pixel, the field contains the sea surface temperature, retrieved from the nadir view measurements only. In other cases the field contents are as defined in the table below.

K/100 512 ss 512*2 byte(s)
6 comb_field
combined field (Note 1)

The GSST product is described as a ��switchable distributed product��, which means that the information supplied for each pixel depends on the surface type of the pixel, and on whether or not it is cloudy. These fields contain a value for each pixel (0 to 511); the interpretation of the value depends on the cloud and land flags in the corresponding confidence word. If the pixel is a clear sea pixel, the field contains the sea surface temperature, retrieved from the combined nadir and forward view measurements only. In other cases the field contents are as defined in the table below.

See Note 1 512 ss 512*2 byte(s)
Record Length : 3092

DS_NAME : Distributed product MDS



Format Version 114.0  

The following table lists the flag bits within the Level 2 GSST Confidence word.

Table 6.69 GSST Confidence Flags

Bit

Meaning if set

0

Nadir-only SST is valid

1

Nadir-only SST retrieval includes 3.7 micron channel

2

Dual-view SST is valid

3

Dual-view SST retrieval includes 3.7 micron channel

4

Pixel is over land

5

Nadir-view pixel is cloudy

6

Nadir-view pixel has blanking pulse

7

Nadir-view pixel is cosmetic fill

     

8

Forward-view pixel is cloudy

9

Forward-view pixel has blanking pulse

10

Forward-view pixel is cosmetic fill

11

One or both views flagged cloudy by 1.6 micron test (daytime only)

12

Cloud flagged by 11 micron/12 micron nadir -forward test

13

One or both views flagged cloudy by infra-red histogram test

14 - 15

Topographic variance flags for LST retrieval

The following table lists the GSST nadir and combined field contents. (IODD Table 6-12).

Table 6.70 GSST Nadir and Combined Field Contents

nadir cloud

forward cloud

land

Nadir field

combined field

0

0

0

SST nadir

SST combined

0

1

0

SST nadir

Note 2

1

0/1

0/1

cloud top temp

cloud top height

0

0/1

1

Land surface temp

NDVI




Notes

1. Bits are numbered from ms bit 15 to ls bit 0.

2. A dual view SST is calculated in this case as if the forward view were cloud-free, but the value is excluded from the smoothing, and the corresponding confidence flag (.dual view SST valid.) is not set.