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Last Post 07 Jun 2010 06:48 AM by  anon
wavelength recalibration for hyperion
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anon



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07 Jun 2010 06:48 AM
    I seem to have some issues with wavelength recalibration on my Hyperion scene. The reflectance image I eventually receive is corrupt as far as I can judge. Spectra don't seem right. I think that is because of some huge wavelength shifts. 3/4 of the channels were shifted by around -15nm. Determined Wavelength Shift Using NODD Algorithm 1.45548 -14.7804 Determined Shift variance 0.0763074 Wavelength recalibration doesn't correspond to the input headers bad band list, does it? I guess this could be the reason. I used Hyperion Tools to load the Hyperion scene into Envi. 155 out of 242 channels were reported as okay. Recalibration incorporates all channels though, I guess. Is it possible that this is an issue of bad bands? I would need to change the spectrograph definition file then? Were can I find the internal Envi definition file for Hyperion? Any other solution/idea? Regards

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    07 Jun 2010 06:51 AM
    ; Project Parameters enviacc.prj.radiance_file = E:\thesis\EO1H0080592005016110PL\EO1H0080592005016110PL.L1R_converted.dat enviacc.prj.reflect_file = E:\thesis\EO1H0080592005016110PL\00_new\vier\re_vier enviacc.prj.water_band_choice = 1.13 enviacc.prj.water_retrieval = 1 enviacc.prj.user_stem_name = flaash_ enviacc.prj.modtran_directory = E:\thesis\EO1H0080592005016110PL\00_new\vier\ ; ; MODTRAN Parameters enviacc.modtran.visvalue = 40.0000 enviacc.modtran.f_resolution = 1.0000 enviacc.modtran.day = 16 enviacc.modtran.month = 1 enviacc.modtran.year = 2005 enviacc.modtran.gmt = 15.0692 enviacc.modtran.latitude = 0.6652 enviacc.modtran.longitude = -76.0018 enviacc.modtran.sensor_altitude = 705.0000 enviacc.modtran.ground_elevation = 0.3500 enviacc.modtran.view_zenith_angle = 173.6731 enviacc.modtran.view_azimuth = 90.0000 enviacc.modtran.atmosphere_model = 1 enviacc.modtran.aerosol_model = 1 enviacc.modtran.multiscatter_model = 2 enviacc.modtran.disort_streams = 8 enviacc.modtran.co2mix = 400.0000 enviacc.modtran.water_column_multiplier = 1.0000 ; ; Image Parameters enviacc.img.nspatial = 256 enviacc.img.nlines = 3352 enviacc.img.data_type = 2 enviacc.img.margin1 = 0 enviacc.img.margin2 = 0 enviacc.img.nskip = 0 enviacc.img.pixel_size = 30.0000 enviacc.img.sensor_name = HYPERION ; ; Analysis Parameters enviacc.ana.aerosol_scaleht = 1.5000 enviacc.ana.use_adjacency = 1 enviacc.ana.output_scale = 10000.0000 enviacc.ana.polishing_res = 0 enviacc.ana.aerosol_retrieval = 1 enviacc.ana.calc_wl_correction = 1 enviacc.ana.reuse_modtran_calcs = 0 enviacc.ana.use_square_slit_function = 0 enviacc.ana.convolution_method = fft enviacc.ana.use_tiling = 0 enviacc.ana.tile_size = 100.0000
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