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SST record 17 km cell MDS
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6.6.7 BT/TOA Sea record 17 km cell MDS

Table 6.32 BT/TOA Sea record 17 km cell MDS

BT/TOA Sea record 10 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 sub-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.

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

The longitude of the lower left-hand corner of the sub-cell, in units of micro-degrees. The longitude is defined in the range -180 degrees to +180 degrees. If the cell contains no valid data, this field may be set to the exceptional value -399,999,999.

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

The average pixel index of the nadir view clear sea pixels that fall within the sub-cell. The pixel index, in the range 0 to 511 inclusive, is the across-track index of the pixel in the image, and is linearly related to the X co-ordinate by X = j - 256 km. The mean across-track pixel index is thus a measure of the X co-ordinate of the centroid of the distribution of clear sea pixels that will contribute to the SST determination. It may be used to select SST retrieval coefficients for the cell.

- 1 ss 2 byte(s)
6 pix_nad
Number of filled pixels in cell, nadir view

The total number of filled pixels, measured in the nadir view, that fall within the sub-cell, regardless of surface type. This differs from the total number of pixels which fall within the sub-cell by the number of unfilled pixels. In the case of 10 arc minute cells the area of the cell, and hence the number of pixels that fall within it, is a function of the latitude.

- 1 ss 2 byte(s)
7 pix_ss_nad
Number of filled pixels in cell over sea surface, nadir view

The total number of filled pixels over sea, measured in the nadir view, that fall within the sub-cell, irrespective of cloud state. It is thus the sum of the numbers of clear sea and cloudy sea pixel in the sub-cell.

- 1 ss 2 byte(s)
8 clpix_ss_nad
Percentage of cloudy pixels in cell over sea surface, nadir view

The percentage of the total number of sea pixels within the sub-cell and measured in the nadir view that are cloudy, expressed as an integer in units of 0.01%.

- 1 ss 2 byte(s)
9 sa_12bt_clr_nad
Spatially averaged 12 micron BT of all clear pixels (nadir view)

The mean calibrated brightness temperature in the 12 micron channel of all the valid clear pixels over sea, measured in the nadir [forward] view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 170,000 to 321,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
10 sa_11bt_clr_nad
Spatially averaged 11 micron BT of all clear pixels (nadir view)

The mean calibrated brightness temperature in the 11 micron channel of all the valid clear pixels over sea, measured in the nadir view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 170,000 to 321,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
11 sa_37bt_clr_nad
Spatially averaged 3.7 micron BT of all clear pixels (nadir view)

The mean calibrated brightness temperature in the 3.7 micron channel of all the valid clear pixels over sea, measured in the nadir view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 195,000 to 321,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
12 sa_16toa_clr_nad
Spatially averaged 1.6 micron TOA reflectance of all clear pixels (nadir view)

The mean calibrated reflectance in the 1.6 micron channel of all the valid clear pixels over sea, measured in the nadir view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
13 sa_87toa_clr_nad
Spatially averaged 0.87 micron TOA reflectance of all clear pixels (nadir view)

The mean calibrated reflectance in the 0.87 micron channel of all the valid clear pixels over sea, measured in the nadir view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
14 sa_67toa_clr_nad
Spatially averaged 0.67 micron TOA reflectance of all clear pixels (nadir view)

The mean calibrated reflectance in the 0.67 micron channel of all the valid clear pixels over sea, measured in the nadir view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
15 sa_55toa_clr_nad
Spatially averaged 0.55 micron TOA reflectance of all clear pixels (nadir view)

The mean calibrated reflectance in the 0.55 micron channel of all the valid clear pixels over sea, measured in the nadir view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
16 sa_12bt_cl_nad
Spatially averaged 12 micron BT of all cloudy pixels (nadir view)

The mean calibrated brightness temperature in the 12 micron channel of all the valid cloudy pixels over sea, measured in the nadir view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 170,000 to 321,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
17 sa_11bt_cl_nad
Spatially averaged 11 micron BT of all cloudy pixels (nadir view)

The mean calibrated brightness temperature in the 11 micron channel of all the valid cloudy pixels over sea, measured in the nadir view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 170,000 to 321,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
18 sa_37bt_cl_nad
Spatially averaged 3.7 micron BT of all cloudy pixels (nadir view)

The mean calibrated brightness temperature in the 3.7 micron channel of all the valid cloudy pixels over sea, measured in the nadir view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 195,000 to 321,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
19 sa_16toa_cl_nad
Spatially averaged 1.6 micron TOA reflectance of all cloudy pixels (nadir view)

The mean calibrated reflectance in the 1.6 micron channel of all the valid cloudy pixels over sea, measured in the nadir view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
20 sa_87toa_cl_nad
Spatially averaged 0.87 micron TOA reflectance of all cloudy pixels (nadir view)

The mean calibrated reflectance in the 0.87 micron channel of all the valid cloudy pixels over sea, measured in the nadir view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
21 sa_67toa_cl_nad
Spatially averaged 0.67 micron TOA reflectance of all cloudy pixels (nadir view)

The mean calibrated reflectance in the 0.67 micron channel of all the valid cloudy pixels over sea, measured in the nadir view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
22 sa_55toa_cl_nad
Spatially averaged 0.55 micron TOA reflectance of all cloudy pixels (nadir view)

The mean calibrated reflectance in the 0.55 micron channel of all the valid cloudy pixels over sea, measured in the nadir view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
23 fail_flag_nad
Pixel threshold failure flags for averages, nadir view

A 16 bit word of quality flags for the nadir view data. Each of bits 0 to 13 of the word is a flag that corresponds to one of the channel/cloud flag combinations (i.e. to one of the nadir view spatially averaged fields of the product), which if set indicates that the number of pixels contributing to the corresponding average is less than a pre-defined quality threshold. The meanings of the flags are tabulated below.

- 1 us 2 byte(s)
24 pix_for
Number of filled pixels in cell, forward view

The total number of filled pixels, measured in the forward view, that fall within the sub-cell, regardless of surface type. This differs from the total number of pixels which fall within the sub-cell by the number of unfilled pixels. In the case of 10 arc minute cells the area of the cell, and hence the number of pixels that fall within it, is a function of the latitude.

- 1 ss 2 byte(s)
25 pix_ss_for
Number of filled pixels in cell over sea surface, forward view

The total number of filled pixels over sea, measured in the forward view, that fall within the sub-cell, irrespective of cloud state. It is thus the sum of the numbers of clear sea and cloudy sea pixel in the sub-cell.

- 1 ss 2 byte(s)
26 perc_cl_pix_ss_for
Percentage of cloudy pixels in cell over sea surface, forward view

The percentage of the total number of sea pixels within the sub-cell and measured in the forward view that are cloudy, expressed as an integer in units of 0.01%.

- 1 ss 2 byte(s)
27 sa_12bt_clr_for
Spatially averaged 12 micron BT of all clear pixels (forward view)

The mean calibrated brightness temperature in the 12 micron channel of all the valid clear pixels over sea, measured in the forward [forward] view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 170,000 to 321,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
28 sa_11bt_clr_for
Spatially averaged 11 micron BT of all clear pixels (forward view)

The mean calibrated brightness temperature in the 11 micron channel of all the valid clear pixels over sea, measured in the forward view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 170,000 to 321,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
29 sa_37bt_clr_for
Spatially averaged 3.7 micron BT of all clear pixels (forward view)

The mean calibrated brightness temperature in the 3.7 micron channel of all the valid clear pixels over sea, measured in the forward view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 195,000 to 321,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
30 sa_16toa_clr_for
Spatially averaged 1.6 micron TOA reflectance of all clear pixels (forward view)

The mean calibrated reflectance in the 1.6 micron channel of all the valid clear pixels over sea, measured in the forward view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
31 sa_87toa_clr_for
Spatially averaged 0.87 micron TOA reflectance of all clear pixels (forward view)

The mean calibrated reflectance in the 0.87 micron channel of all the valid clear pixels over sea, measured in the forward view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
32 sa_67toa_clr_for
Spatially averaged 0.67 micron TOA reflectance of all clear pixels (forward view)

The mean calibrated reflectance in the 0.67 micron channel of all the valid clear pixels over sea, measured in the forward view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
33 sa_55toa_clr_for
Spatially averaged 0.55 micron TOA reflectance of all clear pixels (forward view)

The mean calibrated reflectance in the 0.55 micron channel of all the valid clear pixels over sea, measured in the forward view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid clear sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
34 sa_12bt_cl_for
Spatially averaged 12 micron BT of all cloudy pixels (forward view)

The mean calibrated brightness temperature in the 12 micron channel of all the valid cloudy pixels over sea, measured in the forward view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 170,000 to 321,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
35 sa_11bt_cl_for
Spatially averaged 11 micron BT of all cloudy pixels (forward view)

The mean calibrated brightness temperature in the 11 micron channel of all the valid cloudy pixels over sea, measured in the forward view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 170,000 to 321,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
36 sa_37bt_cl_for
Spatially averaged 3.7 micron BT of all cloudy pixels (forward view)

The mean calibrated brightness temperature in the 3.7 micron channel of all the valid cloudy pixels over sea, measured in the forward view, that fall within the sub-cell. The brightness temperature is expressed as a long (32 bit) integer in units of 0.001 K. Valid mean brightness temperatures will be positive numbers in the range 195,000 to 321,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
37 sa_16toa_cl_for
Spatially averaged 1.6 micron TOA reflectance of all cloudy pixels (forward view)

The mean calibrated reflectance in the 1.6 micron channel of all the valid cloudy pixels over sea, measured in the forward view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
38 sa_87toa_cl_for
Spatially averaged 0.87 micron TOA reflectance of all cloudy pixels (forward view)

The mean calibrated reflectance in the 0.87 micron channel of all the valid cloudy pixels over sea, measured in the forward view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
39 sa_67toa_cl_for
Spatially averaged 0.67 micron TOA reflectance of all cloudy pixels (forward view)

The mean calibrated reflectance in the 0.67 micron channel of all the valid cloudy pixels over sea, measured in the forward view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
40 sa_55toa_cl_for
Spatially averaged 0.55 micron TOA reflectance of all cloudy pixels (forward view)

The mean calibrated reflectance in the 0.55 micron channel of all the valid cloudy pixels over sea, measured in the forward view, that fall within the sub-cell. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid mean reflectances will be positive numbers in the range 0 to 10,000. If no valid cloudy sea pixels fall within the sub-cell, the field will be set to an exceptional value of -1

%/100 1 ss 2 byte(s)
41 fail_flag_for
Pixel threshold failure flags for averages, foward view

A 16 bit word of quality flags for the forward view data. Each of bits 0 to 13 of the word is a flag that corresponds to one of the channel/cloud flag combinations (i.e. to one of the forward view spatially averaged fields of the product), which if set indicates that the number of pixels contributing to the corresponding average is less than a pre-defined quality threshold. The meanings of the flags are tabulated below.

- 1 us 2 byte(s)
Record Length : 122

DS_NAME : BT/TOA Sea record 10 arc minute cell MDS



Format Version 114.0  

The following table defines the contents of the pixel threshold failure flags word.

Table 6.33

Bit

Meaning if set

0

Number of clear pixels contributing to average is less than threshold, 12 micron channel

1

Number of clear pixels contributing to average is less than threshold, 11 micron channel

2

Number of clear pixels contributing to average is less than threshold, 3.7 micron channel

3

Number of clear pixels contributing to average is less than threshold, 1.6 micron channel

4

Number of clear pixels contributing to average is less than threshold, 0.870 micron channel

5

Number of clear pixels contributing to average is less than threshold, 0.670 micron channel

6

Number of clear pixels contributing to average is less than threshold, 0.555 micron channel

7

Number of cloudy pixels contributing to average is less than threshold, 12 micron channel

   

8

Number of cloudy pixels contributing to average is less than threshold, 11 micron channel

9

Number of cloudy pixels contributing to average is less than threshold, 3.7 micron channel

10

Number of cloudy pixels contributing to average is less than threshold, 1.6 micron channel

11

Number of cloudy pixels contributing to average is less than threshold, 0.870 micron channel

12

Number of cloudy pixels contributing to average is less than threshold, 0.670 micron channel

13

Number of cloudy pixels contributing to average is less than threshold, 0.555 micron channel

14

View contains day-time data

15

Unused



Pixel threshold failure flags (nadir or forward view).

Note: Bits are numbered from ms bit 15 to ls bit 0.