Difference between revisions of "HS-6 processing instructions"
| Line 18: | Line 18: | ||
| − | Once finished running process_hs6(pb#), correct bb values from AC-9 a and b values by running sigmacorrect_bb(pb#) in same directory as processing takes place. Sigmacorrect_bb.m needs to be updated to newest HS6 Kexp calibration coefficients ~about line 139 of the script. | + | Once finished running process_hs6(pb#), correct bb values from AC-9 a and b values by running sigmacorrect_bb(pb#) in same directory as processing takes place. Sigmacorrect_bb.m needs to be updated to newest HS6 Kexp calibration coefficients ~about line 139 of the script. Kexp coefficient values are found by opening the HS6 .cal files and looking for "Kexp" under each channel. Channels are ordered low to long wavelength when Kexp values are entered in sigmacorrect_bb. |
Sigma correction is an adjustment to improve the accuracy of | Sigma correction is an adjustment to improve the accuracy of | ||
Revision as of 13:36, 26 May 2016
In April 2010 the HS-6 underwent a calibration and wavelength change. 420 442 470 510 589 700 Original wavelengths were 442 470 510 589 671 870
Processing HS6 is generally the same procedure as the AC-9. See AC-9 processing instructions for more detailed information. The "X" cast is not processed for the HS6.
Hydroscat files must be initially removed from the DH4, then processed through Hydrosoft software on a Windows PC. Files from the DH4 will have a .LOG extension, files processed through Hydrosoft will have a .DAT extension.
The optimum/traditional directory structure for HS6
HYDROSCAT/pb#/
dat
final
from_DH4
-Open Hydrosoft, processing tab, then select Process Raw Files. Select appropriate calibration file from the oceancolor calibration directory, and input/output directories.
Start matlab in the directory you want to process the files in and run process_hs6(pb#). Directory should be parent to those listed above.
Once finished running process_hs6(pb#), correct bb values from AC-9 a and b values by running sigmacorrect_bb(pb#) in same directory as processing takes place. Sigmacorrect_bb.m needs to be updated to newest HS6 Kexp calibration coefficients ~about line 139 of the script. Kexp coefficient values are found by opening the HS6 .cal files and looking for "Kexp" under each channel. Channels are ordered low to long wavelength when Kexp values are entered in sigmacorrect_bb.
Sigma correction is an adjustment to improve the accuracy of backscattering measurements in highly-attenuating water. Some light that would otherwise be detected as backscattering is lost to attenuation in the water between the instrument and the detection volume, causing backscattering to be underestimated. The correction needs attenuation measurements Kbb = a + .4b where b = c-a from AC instrument.
Look at values after processing by running plot_bbp_final(pb###). When opening the file to look at, look in the "final" directory. Files are "ds_##"
