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Vegetation fraction for Land Surface Temperature Retrieval GADS
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6.6.51 Visible calibration coefficients GADS

This product comprises a Main Product Header, a standard Auxiliary Data SPH with one DSD, and the Visible Channel Calibration Parameters GADS as described in the following table. The GADS is a small file of visible channel calibration parameters used by the processor to calibrate visible channel pixel reflectance.


Table 6.86 Visible calibration coefficients GADS

Visible channel calibration parameters GADS

# Description Units Count Type Size
Data Record
0 dsr_time
Time of cal in MJD format

The calibration time given here is an estimate of the time at which the VISCAL unit is fully illuminated by the sun, based on an analytic formula for the solar declination. It defines the centre of the period which is searched for illuminated VISCAL source packets.

MJD 1 mjd 12 byte(s)
1 attach_flag
Attachment flag (always set to zero for this flag)
flag 1 BooleanFlag 1 byte(s)
2 spare_1
Spare
- 1 SpareField 3 byte(s)
3 slp_16_mic
1.6 micron slope

The visible calibration coefficient for the 1.6 micron channel, derived from the VISCAL data for the orbit. This is the slope of the linear relationship between reflectance and instrument count, normalised to unit channel gain, and in the case of the 1.6 micron channel, corrected for channel non-linearity.

- 1 fl 4 byte(s)
4 slp_087_mic
0.870 micron slope

The visible calibration coefficient for the 0.87 micron channel, derived from the VISCAL data for the orbit. This is the slope of the linear relationship between reflectance and instrument count, normalised to unit channel gain.

- 1 fl 4 byte(s)
5 slp_067_mic
0.670 micron slope

The visible calibration coefficient for the 0.67 micron channel, derived from the VISCAL data for the orbit. This is the slope of the linear relationship between reflectance and instrument count, normalised to unit channel gain.

- 1 fl 4 byte(s)
6 slp_055_mic
0.555 micron slope

The visible calibration coefficient for the 0.555 micron channel, derived from the VISCAL data for the orbit. This is the slope of the linear relationship between reflectance and instrument count, normalised to unit channel gain.

- 1 fl 4 byte(s)
7 asc_time
UTC at ascending node crossing, in MJD format

The UTC of the ascending node crossing for the current orbit. This is the ascending node crossing immediately preceding the VISCAL illumination period.

MJD 1 mjd 12 byte(s)
8 ave_mon_cnt
Average Monitor count

The average count in the VISCAL monitor channel during the calibration interval (see link). VISCAL data is only included in the computation of the calibration coefficients if the monitor count exceeds a threshold (1500 counts) and a flatness condition is satisfied.

- 1 fl 4 byte(s)
9 sd_mon_cnt
Standard deviation of Monitor count

The standard deviation of the count in the VISCAL monitor channel during the calibration interval (see link).

- 1 fl 4 byte(s)
10 sol_irr_16
Solar irradiance (1.6 micron)

An estimate of the solar irradiance in the 1.6 micron channel, in units of mW/cm2, at the time of the calibration, based on an analytic formula for the seasonal variation.

- 1 fl 4 byte(s)
11 sol_irr_087
Solar irradiance (0.870 micron)

An estimate of the solar irradiance in the 0.87 micron channel, in units of mW/cm2, at the time of the calibration, based on an analytic formula for the seasonal variation.

- 1 fl 4 byte(s)
12 sol_irr_067
Solar irradiance (0.670 micron)

An estimate of the solar irradiance in the 0.67 micron channel, in units of mW/cm2, at the time of the calibration, based on an analytic formula for the seasonal variation.

- 1 fl 4 byte(s)
13 sol_irr_055
Solar irradiance (0.555 micron)

An estimate of the solar irradiance in the 0.555 micron channel, in units of mW/cm2, at the time of the calibration, based on an analytic formula for the seasonal variation.

- 1 fl 4 byte(s)
14 ave_vispix_16
Average VISCAL Pixel Counts (1.6 (m)

The average count in the 1.6 micron signal channel when viewing the illuminated diffusing plate during the calibration interval (see link).

- 1 fl 4 byte(s)
15 ave_vispix_087
Average VISCAL Pixel Counts (0.87 (m)

The average count in the 0.87 micron signal channel when viewing the illuminated diffusing plate during the calibration interval (see link).

- 1 fl 4 byte(s)
16 ave_vispix_067
Average VISCAL Pixel Counts (0.67 (m)

The average count in the 0.67 micron signal channel when viewing the illuminated diffusing plate during the calibration interval (see link).

- 1 fl 4 byte(s)
17 ave_vispix_055
Average VISCAL Pixel Counts (0.55 (m)

The average count in the 0.555 micron signal channel when viewing the illuminated diffusing plate during the calibration interval (see link).

- 1 fl 4 byte(s)
18 vis_pixnois_16
VISCAL Pixel Noise (1.6 micron)

The standard deviation of the count in the 1.6 micron signal channel when viewing the illuminated diffusing plate during the calibration interval (see link).

- 1 fl 4 byte(s)
19 vis_pixnois_087
VISCAL Pixel Noise (0.87 micron)

The standard deviation of the count in the 0.87 micron signal channel when viewing the illuminated diffusing plate during the calibration interval (see link).

- 1 fl 4 byte(s)
20 vis_pixnois_067
VISCAL Pixel Noise (0.67 micron)

The standard deviation of the count in the 0.67 micron signal channel when viewing the illuminated diffusing plate during the calibration interval (see link).

- 1 fl 4 byte(s)
21 vis_pixnois_055
VISCAL Pixel Noise (0.55 micron)

The standard deviation of the count in the 0.555 micron signal channel when viewing the illuminated diffusing plate during the calibration interval (see link).

- 1 fl 4 byte(s)
22 ave_xbb_16
Average -X BB Pixel Counts (1.6 (m)

The average count (the ��dark count��) in the 1.6 micron signal channel when viewing the selected black body during the calibration interval (see link).

- 1 fl 4 byte(s)
23 ave_xbb_cnt_087
Average -X BB Pixel Counts (0.87 (m)

The average count (the ��dark count��) in the 0.87 micron signal channel when viewing the selected black body during the calibration interval (see link).

- 1 fl 4 byte(s)
24 ave_xbb_cnt_067
Average -X BB Pixel Counts (0.67 (m)

The average count (the ��dark count��) in the 0.67 micron signal channel when viewing the selected black body during the calibration interval (see link).

- 1 fl 4 byte(s)
25 ave_xbb_cnt_055
Average -X BB Pixel Counts (0.55 (m)

The average count (the ��dark count��) in the 0.555 micron signal channel when viewing the selected black body during the calibration interval (see link).

- 1 fl 4 byte(s)
26 xbb_nois_16
-X BB Pixel Noise (1.6 micron)

The standard deviation of the count (the ��dark count��) in the 1.6 micron signal channel when viewing the selected black body during the calibration interval (see link).

- 1 fl 4 byte(s)
27 xbb_nois_087
-X BB Pixel Noise (0.87 micron)

The standard deviation of the count (the ��dark count��) in the 0.87 micron signal channel when viewing the selected black body during the calibration interval (see link).

- 1 fl 4 byte(s)
28 xbb_nois_067
-X BB Pixel Noise (0.67 micron)

The standard deviation of the count (the ��dark count��) in the 0.67 micron signal channel when viewing the selected black body during the calibration interval (see link).

- 1 fl 4 byte(s)
29 xbb_nois_055
-X BB Pixel Noise (0.55 micron)

The standard deviation of the count (the ��dark count��) in the 0.87 micron signal channel when viewing the selected black body during the calibration interval (see link).

- 1 fl 4 byte(s)
30 parity_char
(Reserved for parity indicator)

At present the visible calibration algorithm, unlike that for the thermal infra-red channels, treats all pixels alike regardless of their parity. This location is provided to cater for the hypothetical possibility of an upgrade to the algorithm which would treat odd and even pixels separately and require different calibration coefficients for the two groups.

- 1 ss 2 byte(s)
31 spare_2
Spare
- 1 SpareField 20 byte(s)
Record Length : 154

DS_NAME : Visible channel calibration parameters GADS



Format Version 114.0