Closed dlebauer closed 7 years ago
We are still having difficulties getting the VNIR to run in triggered mode. Would anyone object to freerunning the VNIR for this calibration? We won't have any positional data from the gantry in this mode.
@czender @remotesensinglab I could use some quick input here.
@FlyingWithJerome and I are unsure exactly what freerunning vs. triggered means. The most important thing for the calibration is that the spectralon images are directly comparable to the HS images taken everyday with the same exposure duration.
@smarshall-bmr would please update us the difference between freerunning vs. triggered for image processing? That helps us to provide some feedback.
I think 75% or 50% reflectance targets would be ideal. The main reason for having reflectances over 1 in current calibration protocol is the overexposure. We are getting reflectance values over 1 on top canopy leaves as well, which is an indication of overexposure rather than the reflectance target issues. Higher reflectance targets may be helpful to show the dynamics of reflected light as pure vegetation/leaf reflectance can by up to 0.6.
@smarshall-bmr could you please define triggered vs in triggered mode? Is it in our documentation, or could you put it there?
@smarshall-bmr how would you propose to identify calibration files? @solmazhajmohammadi suggested naming the mission 'hyperspectral-calibration' or similar (or 'calibration' is implied by file type'.
These files have been supplied.
@dlebauer commented on Wed Feb 22 2017
As discussed with @remotesensinglab, @czender, @smarshall-bmr
We need to image the spectralon targets every 15 min throughout the day,
The first priority is a clear day The second priority is to collect images on cloudy days
These datasets will be used in the hyperspectral calibration.
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