Parent Topic: PARAMETERS
AVHRRSEG
Specifies the text segment to receive the AVHRR Calibration/Orbit
data.
EASI>AVHRRSEG=j
EASI>AVHRRSEG= | new segment will be created
This text segment (type 140), named "AVHRRSEG" contains calibration
and orbital data such as:
- Satellite ID (name), orbit ID, year, day of year.
- Upper left and lower right image LONG/LAT coordinates (spatial
extent information).
- A single GCP corresponding to the exact center of the middle
pixel from the first line of the output image.
- Orbital element/ephemeris data: epoch, inclination, right
ascension, argument of perigee, eccentricity, mean motion, mean
anomaly.
- Ascending/descending orbit flag.
- Platinum resistance temperatures.
- Internal target values for channels 3,4,5.
- Grey level of space values for channels 3,4,5.
- Up to 5 LUTs used to compress 10-bit data to 8-bit. If a
particular output channel is not 8-bit, no LUT for that channel
will be created. These LUTs are used by the program, SST.
All values are computed over the input window.
Some of the information contained in the text segment is not
available for certain tape formats. In these instances, default
values will be placed into the text segment as placeholders. If and
when this information can be obtained by other means, the text
segment can be edited to fill in the missing information. For
example, the AES 10-bit and AES TeraScan formats do not provide GCP
data. Hence the single GCP reported in the text segment will be
given a default (invalid) value. If an actual GCP can be acquired
later, the default GCP value in the text segment can be replaced
with the proper value. This will enable the operation of other
programs, such as AVHRCOR, which expect a valid GCP to be present in
the MIAVHRR text segment.
Parent Topic: PARAMETERS
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