=========================================================================
AVIRIS Distribution Document
960710
THIS IS A BETA VERSION OF A NEW FORMAT FOR AVIRIS.
SEND COMMENTS TO rog@gomez.jpl.nasa.gov
All files are in a tar file.
The following types of files should be found:
PER FLIGHT LINE (i.e., occurs once per tar file/tape):
*.avhdr general information about the flight line,
*.brz browse image of the complete flight line,
*.gain multiplication factors, radiance to 16-bit integer,
*.geo geometric calibration data,
*.log log information of the distribution processing,
*.occ on-board calibration correction coefficients,
*.post post flight line on-board calibrator data,
*.pre pre flight line on-board calibrator data,
*.rcc radiometric calibration coefficients,
*.readme this file,
*.spc spectral calibration file.
PER SCENE (i.e., occurs once or several times per tar file/tape):
*.drk1 first part of summed dark signal,
*.drk2 second part of summed dark signal,
*.eng engineering data,
*.nav navigation data,
*.img calibrated AVIRIS radiance (image) data,
To list files (table-of-contents):
tar tvf "tar file name" (on disc),
tar tvf "device name" (on tape).
To extract files:
tar xvf "tar file name" "extract file name" (on disc),
tar xvf "device name" "extract file name" (on tape).
To get information about tar:
man tar
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PER FLIGHT LINE
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*.avhdr GENERAL INFORMATION ABOUT THE FLIGHT LINE
File type: ASCII.
Information about the acquisition of the AVIRIS data.
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*.brz BROWSE IMAGE OF THE AVIRIS FLIGHT LINE
Contents: Four channels of AVIRIS data (channels 10, 33, 128, and 192).
File type: BINARY 16-bit signed integer IEEE.
Units: AVIRIS digitized numbers.
Format: Band interleaved by pixel (channel, sample, line) with dimensions
of (4, 614, NL), where NL = number of lines. To calculate the
number of lines divide the size of the file by 4912 bytes per
line.
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*.gain MULTIPLICATION FACTORS, RADIANCE TO 16-BIT INTEGER
Contents: Multiplication factors to store radiance as 16-bit integers.
File type: ASCII.
Units: none.
Format: Two columns: - Multiplication factor,
- Channel number.
Use: When each spectrum is divided by the factors in this file the
16-bit integers are converted to radiance in units of (micro-
watts/cm^2/nm/sr).
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*.geo GEOMETRIC CALIBRATION DATA
Contents: AVIRIS' spatial resolution on the ground.
File type: ASCII.
Format: Five columns: - Spatial sampling interval (pixel center to center
distance on the ground, in milliradians),
- Spatial response function (the FWHM (in milli-
radians) of the spatial response function (assumed
to be Gaussian); this is a measure of the nominal
pixel size),
- Spatial sampling interval uncertainty (in milli-
radians),
- Spatial response function uncertainty (in milli-
radians),
- Channel number.
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*.log LOG INFORMATION ASSOCIATED WITH DISTRIBUTION PROCESSING
Contents: Date the AVIRIS data were processed for distribution,
Number of lines in the flight line,
Number of scenes in the flight line, and
Number of lines in the last scene.
File type: ASCII.
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*.occ ON-BOARD CALIBRATION CORRECTION COEFFICIENTS
Contents: Calculated on-board calibration coefficients used in radiometric
calibration of the data.
File type: ASCII.
Units: none.
Format: Two columns: - On-board calibration correction coefficient,
- Channel number.
Use: This is the ratio between the on-board calibrator signal at the
time of AVIRIS calibration and the on-board calibrator signal at
the time of the flight line acquisition.
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*.post POST FLIGHT LINE ON-BOARD CALIBRATOR DATA
Contents: AVIRIS data measured from the on-board calibrator after the flight
line.
File type: BINARY 16-bit signed integer IEEE.
Units: AVIRIS digitized numbers.
Format: Band interleaved by pixel (channel, sample, line) with dimensions
of (224, 614, 8).
The 8 lines correspond to: - Dark signal one side of shutter,
- Dark signal other side of shutter,
- Spectral filter A one side of shutter,
- Spectral filter A other side of shutter,
- Spectral filter B one side of shutter,
- Spectral filter B other side of shutter,
- High signal one side of shutter,
- High signal other side of shutter.
Please note that this file may be of size 0 bytes, i.e., containing no data.
This can happen when a flight line is too long to be contained in one file.
Please contact the AVIRIS Data Facility should this be the case (assuming
this data set is needed).
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*.pre PRE FLIGHT LINE ON-BOARD CALIBRATOR DATA
Contents: AVIRIS data measured from the on-board calibrator before the
flight line.
File type: BINARY 16-bit signed integer IEEE.
Units: AVIRIS digitized numbers.
Format: Band interleaved by pixel (channel, sample, line) with dimensions
of (224, 614, 8).
The 8 lines correspond to: - Dark signal one side of shutter,
- Dark signal other side of shutter,
- Spectral filter A one side of shutter,
- Spectral filter A other side of shutter,
- Spectral filter B one side of shutter,
- Spectral filter B other side of shutter,
- High signal one side of shutter,
- High signal other side of shutter.
----------------------------------------------------------------------------
*.rcc RADIOMETRIC CALIBRATION COEFFICIENTS
Contents: AVIRIS radiometric calibration coefficients and laboratory
calibration uncertainty.
File type: ASCII.
Units: microwatts per centimeter_squared per nanometer per steradian
per digitized_number.
Format: Three columns: - Radiometric calibration coefficent,
- Uncertainty in radiometric calibration coeff.,
- Channel number.
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*.readme THIS FILE
File type: ASCII.
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*.spc SPECTRAL CALIBRATION FILE
Contents: AVIRIS spectral calibration.
File type: ASCII.
Units: nanometers.
Format: Five columns: - Wavelength center position,
- Full width at half maximum for equivalent
gaussian,
- Uncertainty in wavelength center position,
- Uncertainty in FWHM for equivalent gaussian,
- Channel number.
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PER SCENE (512 AVIRIS lines of data)
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*.drk1 FIRST PART OF SUMMED DARK SIGNAL
Contents: First part of summed dark signal (most significant 12 bits).
File type: BINARY 16-bit signed integer IEEE.
Units: digitized numbers * 4096.
Format: Band interleaved by pixel (channel, sample, line) with dimensions
of (224, 1, 512). The last scene may be less than 512 lines. To
calculate the number of lines divide the file size by 448 bytes
per line.
----------------------------------------------------------------------------
*.drk2 SECOND PART OF SUMMED DARK SIGNAL
Contents: Second part of summed dark signal (least significant 12 bits).
File type: BINARY 16-bit signed integer IEEE.
Units: digitized numbers.
Format: Band interleaved by pixel (channel, sample, line) with dimensions
of (224, 1, 512). The last scene may be less than 512 lines. To
calculate the number of lines divide the file size by 448 bytes
per line.
----------------------------------------------------------------------------
*.eng ENGINEERING DATA
File type: BINARY 16-bit signed integer IEEE.
ENGINEERING MINOR FRAME 2 FORMAT (12-BIT WORDS)
WORD GROUP MEASUREMENT RANGE LSB/1 DN UNITS REFR.RATE
1 Temperature Detector 1 65 to 91 0.102 K 0.2Hz
2 Temperature Detector 2 65 to 91 0.102 K 0.2Hz
3 Temperature Detector 3 65 to 91 0.102 K 0.2Hz
4 Temperature Detector 4 65 to 91 0.102 K 0.2Hz
5 Temperature Spectrometer 1 -30 to +60 0.35 C 0.2Hz
6 Temperature Spectrometer 2 -30 to +60 0.35 C 0.2Hz
7 Temperature Spectrometer 3 -30 to +60 0.35 C 0.2Hz
8 Temperature Spectrometer 4 -30 to +60 0.35 C 0.2Hz
9 Temperature Scanner optics mount -10 to +80 0.35 C 0.2Hz
10 Temperature Scan motor -30 to +60 0.35 C 0.2Hz
11 Temperature Analog electronics pkg. -30 to +60 0.35 C 0.2Hz
12 Temperature Digital electronics pkg. -30 to +60 0.35 C 0.2Hz
13 Temperature Gnrl. purpose pwr supply -30 to +60 0.35 C 0.2Hz
14 Temperature FPA/Signal chain pwr sup.-30 to +60 0.35 C 0.2Hz
15 Temperature Timing generator pwr sup.-30 to +60 0.35 C 0.2Hz
16 Temperature VLDS scanner -30 to +60 0.35 C 0.2Hz
17 Temperature VLDS transport -30 to +60 0.35 C 0.2Hz
18 Temperature VLDS power supply -30 to +60 0.35 C 0.2Hz
19 Temperature On-board calibrator -30 to +60 0.35 C 0.2Hz
20 Voltage General purpose +5V 2.5 to 7.5 0.02 V 0.2Hz
21 Voltage General purpose +8V 4 to 11 0.027 V 0.2Hz
22 Voltage General purpose +20V 15 to 25 0.039 V 0.2Hz
23 Voltage General purpose -20V -26 to -12 0.055 V 0.2Hz
24 Voltage FPA/Signal chain +5V 2.5 to 7.5 0.02 V 0.2Hz
25 Voltage FPA/Signal chain +8V 4 to 11 0.027 V 0.2Hz
26 Voltage FPA/Signal chain +20V 15 to 25 0.039 V 0.2Hz
27 Voltage FPA/Signal chain -20V -26 to -12 0.055 V 0.2Hz
28 Voltage Timing generator +5V 2.5 to 7.5 0.02 V 0.2Hz
29 Voltage AC bus vltg 115V/400Hz 51.4 to 135 0.33 Vrms 0.2Hz
30 Voltage AC bus voltage +28V 18 to 32 0.055 V 0.2Hz
31 Spare
32 Spare
33 Spare
34 Spare
35 Spare
36 Spare
37 Spare
38 Spare
39 Spare Low rate sense TBD TBD TBD 0.2Hz
40 Spare Low rate sense TBD TBD TBD 0.2Hz
41 Spare Low rate sense TBD TBD TBD 0.2Hz
42 Spare Low rate sense TBD TBD TBD 0.2Hz
43 Spare High rate sense TBD TBD TBD 12Hz
44 Spare High rate sense TBD TBD TBD 12Hz
45 Spare High rate sense TBD TBD TBD 12Hz
46 Voltage Calibration lamp 0.000-8.192 0.002 V 12Hz
47 Current Calibration lamp 1.8000-2.2096 4.00E-04 A 12Hz
48 Scan mirror Linearity count rdng. 1 0 to 5427.2 10.6 uSec 12Hz
49 Scan mirror Linearity count rdng. 2 0 to 5427.2 10.6 uSec 12Hz
50 Scan mirror Linearity count rdng. 3 0 to 5427.2 10.6 uSec 12Hz
51 Scan mirror Linearity count rdng. 4 0 to 5427.2 10.6 uSec 12Hz
52 Scan mirror Linearity count rdng. 5 0 to 5427.2 10.6 uSec 12Hz
53 Scan mirror Linearity count rdng. 6 0 to 5427.2 10.6 uSec 12Hz
54 Scan mirror Linearity count rdng. 7 0 to 5427.2 10.6 uSec 12Hz
55 Scan mirror Linearity count rdng. 8 0 to 5427.2 10.6 uSec 12Hz
56 Scan mirror Linearity count rdng. 9 0 to 5427.2 10.6 uSec 12Hz
57 Scan mirror Linearity count rdng. 10 0 to 5427.2 10.6 uSec 12Hz
58 Scan mirror Linearity count rdng. 11 0 to 5427.2 10.6 uSec 12Hz
59 Instr. gyro Roll reading 1 -1.5 to +1.5 0.012 deg 12Hz
60 Instr. gyro Roll reading 2 -1.5 to +1.5 0.012 deg 12Hz
61 Instr. gyro Roll reading 3 -1.5 to +1.5 0.012 deg 12Hz
62 Instr. gyro Roll reading 4 -1.5 to +1.5 0.012 deg 12Hz
63 Instr. gyro Roll reading 5 -1.5 to +1.5 0.012 deg 12Hz
64 Instr. gyro Roll reading 6 -1.5 to +1.5 0.012 deg 12Hz
65 Instr. gyro Roll reading 7 -1.5 to +1.5 0.012 deg 12Hz
66 Instr. gyro Roll reading 8 -1.5 to +1.5 0.012 deg 12Hz
67 Instr. gyro Roll reading 9 -1.5 to +1.5 0.012 deg 12Hz
68 Instr. gyro Roll reading 10 -1.5 to +1.5 0.012 deg 12Hz
69 Instr. gyro Roll reading 11 -1.5 to +1.5 0.012 deg 12Hz
70 Instr. gyro Pitch reading 1 -1.5 to +1.5 0.012 deg 12Hz
71 Instr. gyro Pitch reading 2 -1.5 to +1.5 0.012 deg 12Hz
72 Instr. gyro Pitch reading 3 -1.5 to +1.5 0.012 deg 12Hz
73 Instr. gyro Pitch reading 4 -1.5 to +1.5 0.012 deg 12Hz
74 Instr. gyro Pitch reading 5 -1.5 to +1.5 0.012 deg 12Hz
75 Instr. gyro Pitch reading 6 -1.5 to +1.5 0.012 deg 12Hz
76 Instr. gyro Pitch reading 7 -1.5 to +1.5 0.012 deg 12Hz
77 Instr. gyro Pitch reading 8 -1.5 to +1.5 0.012 deg 12Hz
78 Instr. gyro Pitch reading 9 -1.5 to +1.5 0.012 deg 12Hz
79 Instr. gyro Pitch reading 10 -1.5 to +1.5 0.012 deg 12Hz
80 Instr. gyro Pitch reading 11 -1.5 to +1.5 0.012 deg 12Hz
81 Reserved -1.5 to +1.5 0.012 deg
82 Reserved -1.5 to +1.5 0.012 deg
83 Reserved -1.5 to +1.5 0.012 deg
84 Reserved -1.5 to +1.5 0.012 deg
85 Reserved -1.5 to +1.5 0.012 deg
86 Reserved -1.5 to +1.5 0.012 deg
87 Reserved -1.5 to +1.5 0.012 deg
88 Reserved -1.5 to +1.5 0.012 deg
89 Reserved -1.5 to +1.5 0.012 deg
90 Reserved -1.5 to +1.5 0.012 deg
91 Reserved -1.5 to +1.5 0.012 deg
92 Reserved TBD TBD TBD
93 Reserved TBD TBD TBD
94 Reserved TBD TBD TBD
95 Reserved TBD TBD TBD
96 Reserved TBD TBD TBD
97 Reserved TBD TBD TBD
98 Reserved TBD TBD TBD
99 Reserved TBD TBD TBD
100 Reserved TBD TBD TBD
101 Reserved TBD TBD TBD
102 Reserved TBD TBD TBD
103 Reserved TBD TBD TBD
104 Reserved TBD TBD TBD
105 Reserved TBD TBD TBD
106 Reserved TBD TBD TBD
107 Reserved TBD TBD TBD
108 Reserved TBD TBD TBD
109 Reserved TBD TBD TBD
110 Reserved TBD TBD TBD
111 Reserved TBD TBD TBD
112 Reserved TBD TBD TBD
113 Reserved TBD TBD TBD
114 Spare
115 Spare
116 Spare
117 Spare
118 Spare
119 Spare
120 Spare
121 Spare
122 Spare
123 Spare
124 Spare
125 F/W status (No. of dark sums) - 1 00 to FF (hex) 0Hz
126 F/W status Digital box 2 status 00 to FF (hex) 0Hz
127 Start of run Year 00 to 99 (BCD) 0Hz
128 Start of run Month 01 to 12 (BCD) 0Hz
129 Start of run Day 01 to 31 (BCD) 0Hz
130 Start of run Hours 00 to 23 (BCD) 0Hz
131 Start of run Minutes 00 to 59 (BCD) 0Hz
132 Start of run Seconds 00 to 59 (BCD) 0Hz
133 Scan timerMSB 94.33kHz cntr - 10.6 uSec 00 to FF (hex) 10.6 uSec 12Hz
134 Scan timerLSB 94.33kHz cntr - 10.6 uSec 00 to FF (hex) 10.6 uSec 12Hz
135 Last P.O.R. Year 00 to 99 (BCD) 0Hz
136 Last P.O.R. Month 01 to 12 (BCD) 0Hz
137 Last P.O.R. Day 01 to 31 (BCD) 0Hz
138 Last P.O.R. Hours 00 to 23 (BCD) 0Hz
139 Last P.O.R. Minutes 00 to 59 (BCD) 0Hz
140 Last P.O.R. Seconds 00 to 59 (BCD) 0Hz
141 H/W status Mechanism pos, misc status00 to FF (hex) 12Hz
142 F/W focus Foreoptics focus position 00 to FF (hex) 12Hz
143 Real-time clock Spare 12Hz
144 Real-time clock CSR 00 to FF (hex) 12Hz
145 Real-time clock Year 00 to 99 (BCD) 12Hz
146 Real-time clock Month 01 to 12 (BCD) 12Hz
147 Real-time clock Day 01 to 31 (BCD) 12Hz
148 Real-time clock Hours 00 to 23 (BCD) 12Hz
149 Real-time clock Minutes 00 to 59 (BCD) 12Hz
150 Real-time clock Seconds 00 to 59 (BCD) 12Hz
151 VLDS Spare
152 VLDS Spare
153 VLDS Main loop counter - MSB 00 to FF (hex) 12Hz
154 VLDS Main loop counter - LSB 00 to FF (hex) 12Hz
155 VLDS Post mortem buf chksumMSB 00 to FF (hex) 12Hz
156 VLDS Post mortem buf chksumLSB 00 to FF (hex) 12Hz
157 VLDS Post mortem event count 0 to A (hex) 12Hz
158 VLDS Status register 23 00 to FF (hex) 12Hz
159 VLDS Status register 22 00 to FF (hex) 12Hz
160 VLDS Status register 21 00 to FF (hex) 12Hz
161 VLDS Status register 20 00 to FF (hex) 12Hz
162 VLDS Status register 19 00 to FF (hex) 12Hz
163 VLDS Status register 18 00 to FF (hex) 12Hz
164 VLDS Status register 17 00 to FF (hex) 12Hz
165 VLDS Status register 16 00 to FF (hex) 12Hz
166 VLDS Status register 15 00 to FF (hex) 12Hz
167 VLDS Status register 14 00 to FF (hex) 12Hz
168 VLDS Status register 13 00 to FF (hex) 12Hz
169 VLDS Status register 12 00 to FF (hex) 12Hz
170 VLDS Status register 11 00 to FF (hex) 12Hz
171 VLDS Status register 10 00 to FF (hex) 12Hz
172 VLDS Status register 9 00 to FF (hex) 12Hz
173 VLDS Status register 8 00 to FF (hex) 12Hz
174 VLDS Status register 7 00 to FF (hex) 12Hz
175 VLDS Status register 6 00 to FF (hex) 12Hz
176 VLDS Status register 5 00 to FF (hex) 12Hz
177 VLDS Status register 4 00 to FF (hex) 12Hz
178 VLDS Status register 3 00 to FF (hex) 12Hz
179 VLDS Status register 2 00 to FF (hex) 12Hz
180 VLDS Status register 1 00 to FF (hex) 12Hz
181 VLDS Status register 0 00 to FF (hex) 12Hz
182 VLDS VLDS attn-0 assertion cnt 00 to FF (hex) 12Hz
183 VLDS VLDS exception halt count 00 to FF (hex) 12Hz
184 VLDS VLDS handshake status 00 to FF (hex) 12Hz
185 VLDS Last GSE req VLDS command 00 to 99 (BCD) 12Hz
186 VLDS Last VLDS command sent 00 to 99 (BCD) 12Hz
187 VLDS Req VLDS register id 00 to 99 (BCD) 12Hz
188 VLDS Req VLDS regstr contents 00 to FF (hex) 12Hz
189 VLDS VLDS error count 00 to FF (hex) 12Hz
190 VLDS VLDS error code 00 to FF (hex) 12Hz
191 VLDS VLDS interface error cnt 00 to FF (hex) 12Hz
192 VLDS VLDS interface error code 00 to FF (hex) 12Hz
193 F/W status Gyro saturation error cnt 00 to FF (hex) 12Hz
194 F/W status Gyro saturation err code 00 to FF (hex) 12Hz
195 F/W status Spare
196 F/W status Spare
197 F/W status Drvng intrpts t-o err cnt 00 to FF (hex) 12Hz
198 F/W status Drvng intrpts t-o err code00 to FF (hex) 12Hz
199 F/W status Cal buf write error count 00 to FF (hex) 12Hz
200 F/W status Cal buf write error code 00 to FF (hex) 12Hz
201 F/W status Quick DMA c-t err count 00 to FF (hex) 12Hz
202 F/W status Quick DMA c-t err code 00 to FF (hex) 12Hz
203 F/W status Quick PROM t-f chksm MSB 00 to FF (hex) 12Hz
204 F/W status Quick PROM t-f chksm LSB 00 to FF (hex) 12Hz
205 F/W status Quick RAM test bad addrMSB00 to FF (hex) 12Hz
206 F/W status Quick RAM test bad addrLSB00 to FF (hex) 12Hz
207 F/W status Anomalous intrpt err cnt 00 to FF (hex) 12Hz
208 F/W status Anomalous intrpt err code 00 to FF (hex) 12Hz
209 F/W status Time delay req error cnt 00 to FF (hex) 12Hz
210 F/W status Time delay req error code 00 to FF (hex) 12Hz
211 F/W status Shutter cntrl error count 00 to FF (hex) 12Hz
212 F/W status Shutter cntrl error code 00 to FF (hex) 12Hz
213 F/W status Cal fltr pos error count 00 to FF (hex) 12Hz
214 F/W status Cal fltr pos error code 00 to FF (hex) 12Hz
215 F/W status Focusing cntrl error cnt 00 to FF (hex) 12Hz
216 F/W status Focusing cntrl error code 00 to FF (hex) 12Hz
217 F/W status DMA controller error cnt 00 to FF (hex) 12Hz
218 F/W status DMA controller error code 00 to FF (hex) 12Hz
219 F/W status ENG data acqstn err count 00 to FF (hex) 12Hz
220 F/W status ENG data acqstn err code 00 to FF (hex) 12Hz
221 F/W status Flight data acqstn errcnt 00 to FF (hex) 12Hz
222 F/W status Flight data acqstn errcode00 to FF (hex) 12Hz
223 F/W status Fatal error count 00 to FF (hex) 12Hz
224 F/W status Fatal error status code 00 to FF (hex) 12Hz
----------------------------------------------------------------------------
*.nav NAVIGATION DATA
File type: ASCII.
This file can be typed to the screen. For each AVIRIS line the values
below are encoded and written in this file:
PARAMETER UNITS FORMAT BYTE SIZE SOURCE
GPS status [G = valid/N = not] XX 2 Inserted
UTC time (GMT) days:hrs:min:sec XXX:XX:XX:XX 12 GPS
Latitude degrees N/S hXX.XXXXX 9 INU
Longitude degrees E/W hXXX.XXXXX 10 INU
True heading degrees XXX.XX 6 INU
Pitch (up = +) degrees sXX.XXXX 8 INU
Roll (right = +) degrees sXX.XXXX 8 INU
Ground speed meters/second XXX.XX 6 INU
Track angle degrees XXX.XX 6 INU
Wind speed meters/second XX.X 4 INU
Wind direction degrees XXX.X 5 INU
Body long. accel. G sX.XXX 6 INU
Body lat. accel. G sX.XXX 6 INU
Body norm. accel. G sX.XXX 6 INU
Track angle rate degrees/second sXX.X 5 INU
Pitch rate degrees/second sXX.X 5 INU
Roll rate degrees/second sXX.X 5 INU
Inert. vert. spd. meters/second sXX.XX 6 INU
GPS altitude meters XXXXX.X 7 GPS
GPS latitude degrees N/S hXX.XXXXX 9 GPS
GPS longitude degrees E/W hXXX.XXXXX 10 GPS
Static pressure millibar XXXX.XXX 8 Analog
Total pressure millibar XXXX.XXX 8 Analog
Diff. pressure millibar XX.XXX 6 Analog
Total temp. degrees C sXX.XX 6 Analog
Static temp. degrees C sXX.XX 6 Derived
Barometric alt. meters XXXXX.X 7 Derived
Mach no. n/a X.XXX 5 Derived
True air speed meters/second XXX.(XX) 4 (6) Derived
[this last value is truncated from 6 to 4 bytes]
----------------------------------------------------------------------------
*.img CALIBRATED AVIRIS RADIANCE (IMAGE) DATA
Contents: AVIRIS calibrated radiance multipled by the gain and stored as
16-bit integers.
File type: BINARY 16-bit signed integer IEEE.
Units: gain times (microwatts per centimeter_squared per nanometer per
steradian).
Format: Band interleaved by pixel (channel, sample, line) with dimensions
(224, 614, 512). The last scene may be less than 512. To
calculate the number of lines divide the file size by 275,072
bytes per line.
--------------------------------------------------------------------------------
KNOWN ARTIFACTS
1) There is a slew effect in the AVIRIS detector array readout. Slew
expresses itself as a slight shift in the IFOV when moving from regions of
very different brightnesses.