AVIRIS DATA FACILITY
96qlook directory
See the top level
README.htm file for ordering and image viewing information.
See the announcements
page for a discussion on the future direction of the image format.
Please ftp a copy of the 96index.ql file from the docs directory, or use the file INDEX in the 96qlook directory. They are the same file. If you're using the WWW, then you can access the index via the INDEX.htm file in 96qlook or the 96index.htm file in docs/html. The file you are currently reading is both docs/html/96readme.htm and 96qlook/README.htm.
The 96index.ql file lists all the 1996 AVIRIS quicklook images based on flight and run. In addition the 1) number of lines, 2) site name, 3) acquisition time, and 4) the starting stopping coordinates and times of the data run are given.
Runs that have more than six scenes (usually 3187 lines, due to pre-calibration data) will have more than one quicklook, for we put at most six scenes in one image file. The naming convention is FFFFFFFRRSS.aql, where the F's are the flight number, the R's the run number, and the S's the starting scene number (which will be 01, 07, 13, etc.) For example, the quicklook for: 1) Flight 960420A, 2) run 4, and 3) starting scene 1 will have the file name 960420A0401.aql.
Once you have identified the quicklooks of interest please ftp them to your local computer. Use binary (sometimes called "image" in some ftp implementataions) format, as opposed to ascii.
These online quicklooks are stored as 2 by 2 line-sample averaged images of up to 6 consecutive AVIRIS scenes of channel 35 data. Each file is exactly 307 samples by 1536 lines. The images are stored a flat binary byte data.
Each original 512 line AVIRIS scene has been independently stretched, so the scene boundaries are generally apparent. Furthermore, there may be uniform black and gray areas. Since each scene is stretched independently, a scene with less than 512 lines (the length of a scene, before averaging) will have black until the end of the scene. The scenes following this partial scene do not exist, and even gray data is substituted so all files are the same size.
Between each scene is a black and white dashed line, and scene 1 is at the top of the image.
To pub directory documentation page
To 96qlook directory listing
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