McIDAS Programmer's Manual
Version 2003
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VASTBLS
VAS calibration tables.
VASTBLS is a binary file that holds the current calibration values of the temperature, brightness and radiance for all 12 channels of GOES AA satellite data. Its fixed size is 1622016 words.
Word allocation for the file
The primary blocks for VASTBLS are shown below. Each block represents a table of calibrated values for each raw value.
|
Word
|
Description
|
|
0 - 540671
|
radiance calibration block (watts/meter**2/steradian*1000)
|
|
540672 - 1081343
|
temperature calibration block, in Kelvin
|
|
1081344 - 1622015
|
brightness calibration block, 0 to 255
|
Word allocation for the primary segment
Each primary segment contains secondary segments (12 maximum) allocated by band number. Word addresses are relative to the start of the primary segment.
|
Word
|
Description
|
|
0 - 45055
|
band 1 block
|
|
45056 - 90111
|
band 2 block
|
|
90112 - 135167
|
band 3 block
|
|
135168 - 180223
|
band 4 block
|
|
180224 - 225279
|
band 5 block
|
|
225280 - 270335
|
band 6 block
|
|
270336 - 315391
|
band 7 block
|
|
315392 - 360447
|
band 8 block
|
|
360448 - 405503
|
band 9 block
|
|
405504 - 450559
|
band 10 block
|
|
450560 - 495615
|
band 11 block
|
|
495616 - 540671
|
band 12 block
|
Word allocation for the secondary segment
Each secondary segment contains base segments allocated by the Delta-F value. This value ranges from -5 to +5, providing 11 base segments per secondary segment. Each of the word addresses below is relative to the start of the secondary segment. The values are the actual numbers used to calibrate the data.
|
Word
|
Description
|
|
0 - 4095
|
Delta-F = -5
|
|
4096 - 8191
|
Delta-F = -4
|
|
8192 - 12287
|
Delta-F = -3
|
|
12288 - 16383
|
Delta-F = -2
|
|
16384 - 20479
|
Delta-F = -1
|
|
20480 - 24575
|
Delta-F = 0
|
|
24576 - 28671
|
Delta-F = +1
|
|
28672 - 32767
|
Delta-F = +2
|
|
32768 - 36863
|
Delta-F = +3
|
|
36864 - 40959
|
Delta-F = +4
|
|
40960 - 45055
|
Delta-F = +5
|
API functions
Currently, no API library functions exist for reading and writing this file.
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