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AVIRIS Distribution Document 030217 |
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SEND COMMENTS TO rog@jpl.nasa.gov |
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Additional informatin may be found on http://aviris.jpl.nasa.gov |
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All distibuted files are in a tar file. |
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The following types of files should be found: |
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PER FLIGHT LINE (i.e., occurs once per tar file/tape): |
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*.info general information about the flight line, |
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*.gain multiplication factors, radiance to 16-bit integer, |
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*.geo geometric calibration data, |
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*.eng engineering data, |
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*.nav navigation data, |
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*.rcc radiometric calibration coefficients, |
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*.readme this file, |
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*.spc spectral calibration file. |
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*.glt geometric look up table |
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*.glt.hdr geometric look up t |
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*.igm input geometry file |
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*.igm.hdr input geometry file header |
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PER SCENE (i.e., occurs once or several times per tar file/tape): |
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*.img calibrated AVIRIS radiance (image) data, |
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*.img.hdr image format of the scene |
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To list files (table-of-contents): |
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tar tvf "tar file name" (on disc), |
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tar tvf "device name" (on tape). |
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To extract files: |
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tar xvf "tar file name" "extract file name" (on disc), |
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tar xvf "device name" "extract file name" (on tape). |
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To get information about tar: |
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man tar |
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PER FLIGHT LINE |
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*.info GENERAL INFORMATION ABOUT THE FLIGHT LINE |
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File type: ASCII. |
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Information about the acquisition of the AVIRIS data. |
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*.gain MULTIPLICATION FACTORS, RADIANCE TO 16-BIT INTEGER |
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Contents: Multiplication factors to store radiance as 16-bit integers. |
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File type: ASCII. |
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Units: none. |
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Format: Two columns: - Multiplication factor, |
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- Channel number. |
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Use: When each spectrum is divided by the factors in this file the |
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16-bit integers are converted to radiance in units of (micro- |
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watts/cm^2/nm/sr). |
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*.geo GEOMETRIC CALIBRATION DATA |
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Contents: AVIRIS' spatial resolution on the ground. |
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File type: ASCII. |
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Format: Five columns: - Spatial sampling interval (pixel center to center |
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distance on the ground, in milliradians), |
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- Spatial response function (the FWHM (in milli- |
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radians) of the spatial response function (assumed |
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to be Gaussian); this is a measure of the nominal |
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pixel size), |
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- Spatial sampling interval uncertainty (in milli- |
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radians), |
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- Spatial response function uncertainty (in milli- |
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radians), |
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- Channel number. |
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*.rcc RADIOMETRIC CALIBRATION COEFFICIENTS |
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Contents: AVIRIS radiometric calibration coefficients and laboratory |
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calibration uncertainty. |
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File type: ASCII. |
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Units: microwatts per centimeter_squared per nanometer per steradian |
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per digitized_number. |
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Format: Three columns: - Radiometric calibration coefficent, |
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- Uncertainty in radiometric calibration coeff., |
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- Channel number. |
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*.readme THIS FILE |
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File type: ASCII. |
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*.spc SPECTRAL CALIBRATION FILE |
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Contents: AVIRIS spectral calibration. |
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File type: ASCII. |
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Units: nanometers. |
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Format: Five columns: - Wavelength center position, |
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- Full width at half maximum for equivalent |
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gaussian, |
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- Uncertainty in wavelength center position, |
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- Uncertainty in FWHM for equivalent gaussian, |
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- Channel number. |
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*.eng ENGINEERING DATA |
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File type: ASCII |
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This file contains the recorded engineering data |
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*.nav NAVIGATION DATA |
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File type: ASCII. |
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This file contains the recorded AVIRIS navigation data. |
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*.igm INPUT GEOMETRY FILE |
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File type: Binary |
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Contents: Band 1 contain determined UTM Easting for each spatial element |
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in the original image. Band 2 contains the UTM Northing. |
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*.igm.hdr HEADER FILE FOR THE INPUT GEOMETRY FILE |
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File type: ASCII |
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Contents: File format description for the *.igm file. |
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*.glt GEOMETRIC LOOK UP TABLE |
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File type: Binary |
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Contents: Band 1 original sample number for the georectified image location. |
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Band 2 original line number for the georectified image location. |
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A negative value indicates the georectified value has been |
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nearest neighbor interpolated |
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*.glt.hdr HEADER FILE FOR THE GEOMETRIC LOOK UP TABLE |
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File type: ASCII |
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Contents: File format description for the *.glt file. |
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========================================================================= |
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PER SCENE (2048 AVIRIS lines of data) |
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*.img CALIBRATED AVIRIS RADIANCE (IMAGE) DATA |
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Contents: AVIRIS calibrated radiance multipled by the gain and stored as |
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16-bit integers. |
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File type: BINARY 16-bit signed integer IEEE. |
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Units: gain times (microwatts per centimeter_squared per nanometer per |
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steradian). |
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Format: Band interleaved by pixel (channel, sample, line) with dimensions |
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(224, ns, nl). |
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*.img.hdr HEADER FILE FOR CALIBRATED AVIRIS RADIANCE (IMAGE) DATA |
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Contents: Format of each AVIRIS calibrated radiance scene. This file contains |
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the number of lines, samples, channel, integer format, etc. |
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File type: ASCII |
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========================================================================= |
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KNOWN ARTIFACTS |
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1) There is a slew effect in the AVIRIS detector array readout. Slew |
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expresses itself as a slight shift in the IFOV when moving from regions of |
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very different brightnesses. |
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2) In 2002, the bad detector at channel 77 has been interpolated. |
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========================================================================= |
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