Changes between Version 4 and Version 5 of Processing/Py6S_vs_Hyperspectral


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Timestamp:
Oct 21, 2015 10:37:40 AM (3 years ago)
Author:
asm
Comment:

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  • Processing/Py6S_vs_Hyperspectral

    v4 v5  
    2121Go to delivery project directory that you want to check. Example:
    2222~arsf/arsf_data/2015/flight_data/spain/EUFAR15_38-2015_170_Mallorca/processing/delivery/EUFAR15_38-170-hyperspectral-20151014
    23 If you are airborne user at the selected delivery directory, you can follow the steps on this wiki and simply copy and paste the comands on the terminal.
     23If you are '''airborne''' user at the selected delivery directory, you can follow the steps on this wiki and simply '''copy and paste''' the commands on the terminal.
    2424
    25 Create a new folder as '''airborne''' user on the processing directory:
     25Create a new folder as airborne user on the processing directory:
    2626{{{
    2727mkdir ../../../processing/fenix_vs_py6s
     
    5656Both curves (Fenix and Py6S) should match general features. The peaks and depression (reflecfance-absorption) caused by vegetation have to match and there should be no other spikes on the Fenix spectra that does not match the Py6s. However, note that it is probably to have a spike on some Fenix spectra flightlines on the bands around band 349, close to 900-950 nm. This is caused by the shift on the SWIR bands detected on on October 2014 and those pixels are listed as bad pixels, therefore the spectra recorded by Fenix is correct. You can find a picture illustrating this issue which also suggest the type of spike you have to look for when they are not on the overlapping region.
    5757
    58 Under_picture: Figure shows Fenix vs Py6S. Both spectra matches except for a Fenix spike close to 950 nm. No other spikes or depressions like which does not match the Py6S model should be found outside that region.
    5958
    60 Moreover, peaks VNIR (around 750-850 nm) and SWIR (1000 nm) has to be present on the Fenix spectra. The SWIR peak should be lower than the VNIR but both of them should be comparable. (Print pictures from wiki)
     59[[Image(f170021b_fenix_vs_sim_veg_spectra1.png​, nolink, title="Py6S vs Fenix", margin=20, width=500px)]]
     60
     61'''Figure above shows''' Fenix vs Py6S. Both spectra matches except for a Fenix spike close to 950 nm. No other spikes or depressions like which does not match the Py6S model should be found outside that region.
     62
     63Moreover, peaks VNIR (around 750-850 nm) and SWIR (1000 nm) has to be present on the Fenix spectra. The SWIR peak should be lower than the VNIR but both of them should be comparable. You can find more detailed [wiki:Procedures/DeliveryChecking/ExampleFenixSpectra examples with pictures about erroneous spectra here].