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+--- Thread: which bands for water vapour retreival (/showthread.php?tid=89)
which bands for water vapour retreival - rese_support - 26-Jun-2015
Quote: I was wondering which bands (channels) need to beThe start/stop interpolation wavelengths are meant if water vapor
selected in Window 1 and Window 2 for water vapour retreival with band
regression in ATCOR4. The default window 1 890.5 890.5 Channels 53-53
Water vapour (WV) absorption region 937.0 and 958.0 nm (channels 58 to
60). or could we just accept the default bands in window 1 and wv
absorption region but make changes in preference_parameters.dat file
885.0 1000.0 start/stop for interpolation in 940nm region. (default).
retrieval is not very successful (e.g., if the 940nm band calibration is
bad). So, it won't affect the retrieval but rather the interpolation in
case the 940/1130 interpolation flag is set in the preferences. For the
water vapor retrieval, one can use the recommended bands - for AISA,
often the 820 nm band works better than the 940 band, however.
Quote: Should we take this decision based on the data, or areIt depends on the sensor configuration and one has to check out the
there some generic rules on how to choose the wavelengths for water
vapor estimation?
water vapor map - if it is smooth everything should be fine. If not, one
should go for another absorption region or use different bands (e.g.
more in the center, broader ranges). Such adjustments require
experience, however.