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==Format== | ==Format== | ||
*.2dc - 2-DC data structure with format: | |||
twodc = REPLICATE({ $ ; Byte Description | twodc = REPLICATE({ $ ; Byte Description | ||
FRONT:161UL, $ ; 00-03 CONSTANT Y'10100001' | FRONT:161UL, $ ; 00-03 CONSTANT Y'10100001' | ||
| Line 14: | Line 13: | ||
Spare2:0UL}, $ ; 4124-4127 Spare | Spare2:0UL}, $ ; 4124-4127 Spare | ||
4) ; 4 element Array | 4) ; 4 element Array | ||
*.cip - Cloud Imaging Probe (CIP) image data stored in the 2-DC data structure. Format is: | |||
cip = REPLICATE({ $ ; Byte Description | |||
FRONT:161UL, $ ; 00-03 CONSTANT Y'10100001' | |||
IMAGE:BYTARR(4096), $ ; 04-4099 CIP compressed image slices | |||
STTIME:0UL, $ ; 4100-4103 Image Start (Seconds from midnight*10000) | |||
NDTIME:0UL, $ ; 4104-4107 Image End (Seconds from midnight*10000) | |||
STTAS:0U, $ ; 4108-4109 Image Start TAS *100 | |||
NDTAS:0U, $ ; 4110-4111 Image End TAS *100 | |||
SPARE:0UL, $ ; 4112-4115 Space | |||
DATE:0UL, $ ; 4116-4119 Date (MMDDYY) | |||
Spare1:0UL, $ ; 4120-4123 Total Air Temperature Multiplied by 100 in Kelvin | |||
Spare2:0UL}, $ ; 4124-4127 Spare | |||
4) ; 4 element Array | |||
*.pip - Precipitation Imaging Probe (PIP) image data stored in the 2-DC data structure. Format is: | |||
pip = REPLICATE({ $ ; Byte Description | |||
FRONT:161UL, $ ; 00-03 CONSTANT Y'10100001' | |||
IMAGE:BYTARR(4096), $ ; 04-4099 PIP compressed image slices | |||
STTIME:0UL, $ ; 4100-4103 Image Start (Seconds from midnight*10000) | |||
NDTIME:0UL, $ ; 4104-4107 Image End (Seconds from midnight*10000) | |||
STTAS:0U, $ ; 4108-4109 Image Start TAS *100 | |||
NDTAS:0U, $ ; 4110-4111 Image End TAS *100 | |||
SPARE:0UL, $ ; 4112-4115 Space | |||
DATE:0UL, $ ; 4116-4119 Date (MMDDYY) | |||
Spare1:0UL, $ ; 4120-4123 Total Air Temperature Multiplied by 100 in Kelvin | |||
Spare2:0UL}, $ ; 4124-4127 Spare | |||
4) ; 4 element Array | |||
Note: The 2-DC image data slices are stored in a 12-bit array while the CIP and PIP image data are compressed binary data that are stored within a 12-byte array. Therefore a decompression routine is required to extract the CIP and PIP images from this format. | |||
==Conversion from Total Air Temperature (TAT) to Static Air Temperature (SAT)== | ==Conversion from Total Air Temperature (TAT) to Static Air Temperature (SAT)== | ||
Latest revision as of 18:17, 21 March 2019
Format
*.2dc - 2-DC data structure with format:
twodc = REPLICATE({ $ ; Byte Description
FRONT:161UL, $ ; 00-03 CONSTANT Y'10100001'
IMAGE:BYTARR(4096), $ ; 04-4099 2-D Image Slices
STTIME:0UL, $ ; 4100-4103 Image Start (Seconds from midnight*10000)
NDTIME:0UL, $ ; 4104-4107 Image End (Seconds from midnight*10000)
STTAS:0U, $ ; 4108-4109 Image Start TAS *100
NDTAS:0U, $ ; 4110-4111 Image End TAS *100
SPARE:0UL, $ ; 4112-4115 Space
DATE:0UL, $ ; 4116-4119 Date (MMDDYY)
Spare1:0UL, $ ; 4120-4123 Total Air Temperature Multiplied by 100 in Kelvin
Spare2:0UL}, $ ; 4124-4127 Spare
4) ; 4 element Array
*.cip - Cloud Imaging Probe (CIP) image data stored in the 2-DC data structure. Format is:
cip = REPLICATE({ $ ; Byte Description
FRONT:161UL, $ ; 00-03 CONSTANT Y'10100001'
IMAGE:BYTARR(4096), $ ; 04-4099 CIP compressed image slices
STTIME:0UL, $ ; 4100-4103 Image Start (Seconds from midnight*10000)
NDTIME:0UL, $ ; 4104-4107 Image End (Seconds from midnight*10000)
STTAS:0U, $ ; 4108-4109 Image Start TAS *100
NDTAS:0U, $ ; 4110-4111 Image End TAS *100
SPARE:0UL, $ ; 4112-4115 Space
DATE:0UL, $ ; 4116-4119 Date (MMDDYY)
Spare1:0UL, $ ; 4120-4123 Total Air Temperature Multiplied by 100 in Kelvin
Spare2:0UL}, $ ; 4124-4127 Spare
4) ; 4 element Array
*.pip - Precipitation Imaging Probe (PIP) image data stored in the 2-DC data structure. Format is:
pip = REPLICATE({ $ ; Byte Description
FRONT:161UL, $ ; 00-03 CONSTANT Y'10100001'
IMAGE:BYTARR(4096), $ ; 04-4099 PIP compressed image slices
STTIME:0UL, $ ; 4100-4103 Image Start (Seconds from midnight*10000)
NDTIME:0UL, $ ; 4104-4107 Image End (Seconds from midnight*10000)
STTAS:0U, $ ; 4108-4109 Image Start TAS *100
NDTAS:0U, $ ; 4110-4111 Image End TAS *100
SPARE:0UL, $ ; 4112-4115 Space
DATE:0UL, $ ; 4116-4119 Date (MMDDYY)
Spare1:0UL, $ ; 4120-4123 Total Air Temperature Multiplied by 100 in Kelvin
Spare2:0UL}, $ ; 4124-4127 Spare
4) ; 4 element Array
Note: The 2-DC image data slices are stored in a 12-bit array while the CIP and PIP image data are compressed binary data that are stored within a 12-byte array. Therefore a decompression routine is required to extract the CIP and PIP images from this format.
Conversion from Total Air Temperature (TAT) to Static Air Temperature (SAT)
The difference between TAT and SAT is called ram rise (RR) and is caused by compressibility and friction of the air at high velocities.
<math>RRtotal=TAT-SAT</math>
where
<math>RRtotal=V^2/87^2</math>
V is the air speed in knot