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Vegetation fraction for Land Surface Temperature Retrieval GADS
Topographic Variance data for Land Surface Temperature Retrieval GADS
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General Parameters for Land Surface Temperature Retrieval GADS
Climatology Variance Data for Land Surface Temperature Retrieval GADS
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1.6 micron nadir view MDS
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LST record 50 km cell MDS
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10-arcminute mds
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BT/TOA Land record 17 km cell MDS
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ATS_VC1_AX: Visible Calibration data
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SST record 17 km cell MDS
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LST record 17 km cell MDS
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ATS_PC2_AX: Level-2 Processor Configuration data
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6.6.2 BT/TOA Land record 50 km cell MDS

Table 6.22 BT/TOA Land record 50 km cell MDS

BT/TOA Land 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.

(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. 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 to be associated with the land/sea pixels that contribute to the cell averages. It is the unweighted average of the sub-cell mean across-track pixel number for the contributing sub-cells (those containing at least one valid pixel). The pixel index, in the range 0 to 511 inclusive, is the across-track index of the pixel in the image, and ids linearly related to the X co-ordinate by X = j - 256 km. The mean across-track pixel index is thus a measure of the mean X co-ordinate of the of the distribution of clear land/sea pixels that contribute to the ABT determination.

- 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 cell, regardless of surface type. This differs from the total number of pixels which fall within the cell by the number of unfilled pixels. In the case of 30 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_ls_nad
Number of filled pixels in cell over land surface, nadir view

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

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

The percentage of the total number of land pixels within the 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 lat_corr_nad
Topographic latitude correction, nadir view

The geolocation of the AATSR pixels assumes that the surface is at mean sea level. This will give rise to errors in the case of elevated land. This field is intended to contain the mean geolocation error in latitude over the cell from this cause, for the nadir view, based on surface elevations taken from a standard DTM. The correction is in units of microdegrees, in the sense true minus nominal latitude. Currently this field is undefined.

(1e-6) degrees 1 sl 4 byte(s)
10 long_corr_nad
Topographic longitude correction, nadir view

The geolocation of the AATSR pixels assumes that the surface is at mean sea level. This will give rise to errors in the case of elevated land. This field is intended to contain the mean geolocation error in longitude over the cell from this cause, for the nadir view, based on surface elevations taken from a standard DTM. The correction is in units of microdegrees, in the sense true minus nominal longitude. Currently this field is undefined.

(1e-6) degrees 1 sl 4 byte(s)
11 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 land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land 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 sd_12bt_clr_nad
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 12 micron BT of all clear nadir view pixels.

K/1000 1 sl 4 byte(s)
13 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 land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
14 sd_11bt_clr_nad
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 11 micron BT of all clear nadir view pixels.

K/1000 1 sl 4 byte(s)
15 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 land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
16 sd_37bt_clr_nad
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 3.7 micron BT of all clear nadir view pixels.

%/1000 1 sl 4 byte(s)
17 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 land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average TOA reflectance over the sub-cells within the cell that contain at least one valid pixel. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid reflectance values will be positive numbers in the range 0 to 10,000. If no valid clear land pixels fall within the cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
18 sd_16toa_clr_nad
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 1.6 micron TOA reflectance of all clear nadir view pixels.

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

The mean calibrated brightness temperature in the 0.87 micron channel of all the valid clear pixels over land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
20 sd_87toa_clr_nad
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.87 micron TOA reflectance of all clear nadir view pixels.

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

The mean calibrated brightness temperature in the 0.67 micron channel of all the valid clear pixels over land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
22 sd_67toa_clr_nad
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.67 micron TOA reflectance of all clear nadir view pixels.

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

The mean calibrated brightness temperature in the 0.55 micron channel of all the valid clear pixels over land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
24 sd_55toa_clr_nad
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.55 micron TOA reflectance of all clear nadir view pixels.

%/100 1 ss 2 byte(s)
25 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 land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
26 sd_12bt_cl_nad
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 12 micron BT of all cloudy nadir view pixels.

K/1000 1 sl 4 byte(s)
27 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 land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land 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 sd_11bt_cl_nad
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 11 micron BT of all cloudy nadir view pixels.

K/1000 1 sl 4 byte(s)
29 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 land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land 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 sd_37bt_cl_nad
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 3.7 micron BT of all cloudy nadir view pixels.

%/1000 1 sl 4 byte(s)
31 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 land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average TOA reflectance over the sub-cells within the cell that contain at least one valid pixel. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid reflectance values will be positive numbers in the range 0 to 10,000. If no valid cloudy land pixels fall within the cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
32 sd_16toa_cl_nad
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 1.6 micron TOA reflectance of all cloudy nadir view pixels.

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

The mean calibrated brightness temperature in the 0.87 micron channel of all the valid cloudy pixels over land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
34 sd_87toa_cl_nad
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.87 micron TOA reflectance of all cloudy nadir view pixels.

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

The mean calibrated brightness temperature in the 0.67 micron channel of all the valid cloudy pixels over land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
36 sd_67toa_cl_nad
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.67 micron TOA reflectance of all cloudy nadir view pixels.

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

The mean calibrated brightness temperature in the 0.55 micron channel of all the valid cloudy pixels over land, measured in the nadir view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
38 sd_55toa_cl_nad
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.55 micron TOA reflectance of all cloudy nadir view pixels

%/100 1 ss 2 byte(s)
39 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 cell average is less than a pre-defined quality threshold. The meanings of the flags are tabulated below.

- 1 us 2 byte(s)
40 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 cell, regardless of surface type. This differs from the total number of pixels which fall within the cell by the number of unfilled pixels. In the case of 30 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)
41 pix_ls_for
Number of filled pixels in cell over land surface, forward view

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

- 1 ss 2 byte(s)
42 perc_cl_pix_ls_for
Percentage of cloudy pixels in cell over land surface, forward view

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

- 1 ss 2 byte(s)
43 lat_corr_for
Topographic latitude correction, forward view

The geolocation of the AATSR pixels assumes that the surface is at mean sea level. This will give rise to errors in the case of elevated land. This field is intended to contain the mean geolocation error in latitude over the cell from this cause, for the forward view, based on surface elevations taken from a standard DTM. The correction is in units of microdegrees, in the sense true minus nominal latitude. Currently this field is undefined.

(1e-6) degrees 1 sl 4 byte(s)
44 long_corr_for
Topographic longitude correction, forward view

The geolocation of the AATSR pixels assumes that the surface is at mean sea level. This will give rise to errors in the case of elevated land. This field is intended to contain the mean geolocation error in longitude over the cell from this cause, for the forward view, based on surface elevations taken from a standard DTM. The correction is in units of microdegrees, in the sense true minus nominal longitude. Currently this field is undefined.

(1e-6) degrees 1 sl 4 byte(s)
45 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 land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
46 sd_12bt_clr_for
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 12 micron BT of all clear forward view pixels.

K/1000 1 sl 4 byte(s)
47 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 land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
48 sd_11bt_clr_for
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 11 micron BT of all clear forward view pixels.

K/1000 1 sl 4 byte(s)
49 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 land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
50 sd_37bt_clr_for
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 3.7 micron BT of all clear forward view pixels.

K/1000 1 sl 4 byte(s)
51 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 land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average TOA reflectance over the sub-cells within the cell that contain at least one valid pixel. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid reflectance values will be positive numbers in the range 0 to 10,000. If no valid clear land pixels fall within the cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
52 sd_16toa_clr_for
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 1.6 micron TOA reflectance of all clear forward view pixels.

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

The mean calibrated brightness temperature in the 0.87 micron channel of all the valid clear pixels over land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
54 sd_87toa_clr_for
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.87 micron TOA reflectance of all clear forward view pixels.

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

The mean calibrated brightness temperature in the 0.67 micron channel of all the valid clear pixels over land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
56 sd_67toa_clr_for
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.67 micron TOA reflectance of all clear forward view pixels.

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

The mean calibrated brightness temperature in the 0.55 micron channel of all the valid clear pixels over land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
58 sd_55toa_clr_for
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.55 micron TOA reflectance of all clear forward view pixels.

%/100 1 ss 2 byte(s)
59 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 land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
60 sd_12bt_cl_for
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 12 micron BT of all cloudy forward view pixels.

K/1000 1 sl 4 byte(s)
61 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 land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
62 sd_11bt_cl_for
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 11 micron BT of all cloudy forward view pixels.

K/1000 1 sl 4 byte(s)
63 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 land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

K/1000 1 sl 4 byte(s)
64 sd_37bt_cl_for
Standard deviation of above

The standard deviation of the sub-cell brightness temperatures that contribute to the spatially averaged 3.7 micron BT of all cloudy forward view pixels.

K/1000 1 sl 4 byte(s)
65 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 land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average TOA reflectance over the sub-cells within the cell that contain at least one valid pixel. The reflectance is expressed as a short (16 bit) integer in units of 0.01 %. Valid reflectance values will be positive numbers in the range 0 to 10,000. If no valid cloudy land pixels fall within the cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
66 sd_16toa_cl_for
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 1.6 micron TOA reflectance of all cloudy forward view pixels.

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

The mean calibrated brightness temperature in the 0.87 micron channel of all the valid cloudy pixels over land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
68 sd_87toa_cl_for
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.87 micron TOA reflectance of all cloudy forward view pixels.

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

The mean calibrated brightness temperature in the 0.67 micron channel of all the valid cloudy pixels over land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
70 sd_67toa_cl_for
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.67 micron TOA reflectance of all cloudy forward view pixels.

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

The mean calibrated brightness temperature in the 0.55 micron channel of all the valid cloudy pixels over land, measured in the forward view, that fall within the cell. This is an unweighted mean of the corresponding average BT over the sub-cells within the cell that contain at least one valid pixel. 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 land pixels fall within the sub-cell, the field will be set to an exceptional value of -1.

%/100 1 ss 2 byte(s)
72 sd_55toa_cl_for
Standard deviation of above

The standard deviation of the sub-cell reflectance values that contribute to the spatially averaged 0.55 micron TOA reflectance of all cloudy forward view pixels

%/100 1 ss 2 byte(s)
73 fail_flag_for
Pixel threshold failure flags for averages, forward 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 cell average is less than a pre-defined quality threshold. The meanings of the flags are tabulated below.

- 1 us 2 byte(s)
74 pix_nsig_nad
Number of filled pixels (N-Sigma), nadir view

Reserved: this field is currently undefined and is set to zero.

- 1 ss 2 byte(s)
75 pix_ss
Percentage filled pixels over land surface

Reserved: this field is currently undefined and is set to zero.

%/100 1 ss 2 byte(s)
76 low_11bt_cl_nad
Lowest 11 micron BT of all cloudy pixels, nadir view

The minimum brightness temperature in the 11 micron channel of all valid cloudy land pixels measured in the nadir view and falling within the cell, in units of 0.01K. A pixel is valid in this sense if its 11 micron brightness temperature falls between 190K and 290 K.

K/100 1 ss 2 byte(s)
77 corr_12bt_nad
Corresponding 12 micron BT, nadir view

The brightness temperature in the 12 micron nadir view channel, in units of 0.01K, of the cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

K/100 1 ss 2 byte(s)
78 corr_37bt_nad
Corresponding 3.7 micron BT, nadir view

The brightness temperature in the 3.7 micron nadir view channel, in units of 0.01K, of the cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

K/100 1 ss 2 byte(s)
79 corr_16ref_nad
Corresponding 1.6 micron reflectance, nadir view

The reflectance at 1.6 micron wavelength, in units of 0.01%, of the nadir view cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

%/100 1 ss 2 byte(s)
80 corr_87ref_nad
Corresponding 0.87 micron reflectance, nadir view

The reflectance at 0.87 micron wavelength, in units of 0.01%, of the nadir view cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

%/100 1 ss 2 byte(s)
81 corr_67ref_nad
Corresponding 0.67 micron reflectance, nadir view

The reflectance at 0.67 micron wavelength, in units of 0.01%, of the nadir view cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

%/100 1 ss 2 byte(s)
82 corr_55ref_nad
Corresponding 0.55 micron reflectance, nadir view

The reflectance at 0.55 micron wavelength, in units of 0.01%, of the nadir view cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

%/100 1 ss 2 byte(s)
83 low_11bt_cl_for
Lowest 11 micron BT of all cloudy pixels, forward view

The minimum brightness temperature in the 11 micron channel of all valid cloudy land pixels measured in the forward view and falling within the cell, in units of 0.01K. A pixel is valid in this sense if its 11 micron brightness temperature falls between 190K and 290 K.

K/100 1 ss 2 byte(s)
84 corr_12bt_for
Corresponding 12 micron BT, forward view

The brightness temperature in the 12 micron forward view channel, in units of 0.01K, of the cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

K/100 1 ss 2 byte(s)
85 corr_37bt_for
Corresponding 3.7 micron BT, forward view

The brightness temperature in the 3.7 micron forward view channel, in units of 0.01K, of the cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

K/100 1 ss 2 byte(s)
86 corr_16ref_for
Corresponding 1.6 micron reflectance, forward view

The reflectance at 1.6 micron wavelength, in units of 0.01%, of the forward view cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

%/100 1 ss 2 byte(s)
87 corr_87ref_for
Corresponding 0.87 micron reflectance, forward view

The reflectance at 0.87 micron wavelength, in units of 0.01%, of the forward view cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

%/100 1 ss 2 byte(s)
88 corr_67ref_for
Corresponding 0.67 micron reflectance, forward view

The reflectance at 0.67 micron wavelength, in units of 0.01%, of the forward view cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

%/100 1 ss 2 byte(s)
89 corr_55ref_for
Corresponding 0.55 micron reflectance, forward view

The reflectance at 0.55 micron wavelength, in units of 0.01%, of the forward view cloudy land pixel (above) having the minimum brightness temperature measured in the 11 micron channel.

%/100 1 ss 2 byte(s)
Record Length : 250

DS_NAME : BT/TOA Land record 30 arc minute cell MDS



Format Version 114.0  

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

Table 6.23 Pixel threshold failure flags (nadir or forward view)

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



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


Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry