Changes between Initial Version and Version 1 of Processing/Wavelengths


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Timestamp:
Mar 4, 2008 6:01:27 PM (11 years ago)
Author:
mggr
Comment:

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  • Processing/Wavelengths

    v1 v1  
     1You can get the bandwidth information from an HDF files by running azexhdf on it.  The information is stored in several vectors in the HDF.  For CCD sensors, the key vectors are:
     2 * CAwavc: wavelength central frequencies for CCD sensors (CASI, Eagle, Hawk), in nm
     3 * CAwavh: wavelength half bandwidth for CCD sensors (CASI, Eagle, Hawk), in nm
     4
     5The length of the vectors will vary for CCD sensors depending on the band configuration.
     6
     7For ATM,
     8 * ATwavu & ATwavl: upper and lower wavelength limits for ATM, in nm
     9
     10The ATM vectors will never vary.
     11
     12== Example commands ==
     13
     14General form: `azexhdf -vf OUTPUT_FILE.txt -vn VECTOR_NAME -h LEV1_HDF_FILENAME`
     15
     16`azexhdf -vf casi192_wave_centre.txt -vn CAwavc -h lev1/c192a011b.hdf `
     17 * this prints lots of information and also outputs the vector as space-separated numbers to the file, e.g.
     18{{{
     19 408.94 440.93 488.94 508.72 528.52 559.66 570.06 588.97 620.21 648.68 670.55 679.11 684.83 704.86 754.62 779.60 871.54
     20}}}
     21
     22A unix command to transpose this output into a column is `cat OUTPUT_FILE.txt | tr ' ' \\n > OUTPUT_FILE-transposed.txt`
     23
     24Band Center-Wavelength Half-bandwidth
     25 1    408.94            6.74479
     26 2    439.04            6.74581
     27 3    487.99            6.75106
     28 4    507.78            7.69685
     29 5    557.78            6.76623
     30 6    617.37            7.73400
     31 7    661.99            6.80551
     32 8    678.16            5.86114
     33 9    705.81            6.82787
     3410    748.86            3.97656
     3511    757.50            3.01953
     3612    775.75            9.75582
     3713    862.78           11.79800
     3814    882.26            5.97619