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Last Post 26 Jul 2010 03:41 AM by  anon
Why the FLAASH processing is failed?
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anon



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26 Jul 2010 03:41 AM
    I am try to finish a atmospheric correction of TM image by the FLAASH model, but it failed all the time. The error message said that a space problem, however, I have 4G physical memory and 23G free disk space. It same that no the case. Before the atmospheric correction, I have calibrated the image by Landsat calibration model, and converted the file into BIL format, and the FLAASH parameters as follow: ; ;ENVI FLAASH PARAMETERS TEMPLATE (4.7 SP2) ;Written Mon Jul 26 17:17:16 2010 ; ; Project Parameters enviacc.prj.radiance_file = H:\Image\Output\Classfication\TempResults\Pre-Processing\LT51240472004355BKT00_Calibration_UnitConvert_BIL.img enviacc.prj.reflect_file = H:\Image\Output\Classfication\TempResults\Pre-Processing\LT51240472004355BKT00_Calibration_Ref.img enviacc.prj.filter_func_file = D:\Program Files\ITT\IDL71\products\envi47\filt_func\tm.sli enviacc.prj.filter_func_file_index = 6 enviacc.prj.water_band_choice = 1.13 enviacc.prj.red_channel = 3 enviacc.prj.green_channel = 2 enviacc.prj.blue_channel = 0 enviacc.prj.water_abs_channel = 0 enviacc.prj.water_ref_channel = 0 enviacc.prj.kt_upper_channel = 6 enviacc.prj.kt_lower_channel = 3 enviacc.prj.kt_cutoff = 0.1000 enviacc.prj.kt_ratio = 0.4500 enviacc.prj.cirrus_channel = 5 enviacc.prj.water_retrieval = 0 enviacc.prj.modtran_directory = H:\Image\Output\Classfication\TempResults\Pre-Processing\FLAASH\ ; ; MODTRAN Parameters enviacc.modtran.visvalue = 30.0000 enviacc.modtran.f_resolution = 15.0000 enviacc.modtran.day = 20 enviacc.modtran.month = 12 enviacc.modtran.year = 2004 enviacc.modtran.gmt = 2.8575 enviacc.modtran.latitude = 18.7686 enviacc.modtran.longitude = 109.4911 enviacc.modtran.sensor_altitude = 705.0000 enviacc.modtran.ground_elevation = 0.0500 enviacc.modtran.view_zenith_angle = 180.0000 enviacc.modtran.view_azimuth = 0.0000 enviacc.modtran.atmosphere_model = 1 enviacc.modtran.aerosol_model = 4 enviacc.modtran.multiscatter_model = 2 enviacc.modtran.disort_streams = 8 enviacc.modtran.co2mix = 390.0000 enviacc.modtran.water_column_multiplier = 1.0000 ; ; Image Parameters enviacc.img.nspatial = 8131 enviacc.img.nlines = 7081 enviacc.img.data_type = 4 enviacc.img.margin1 = 0 enviacc.img.margin2 = 0 enviacc.img.nskip = 0 enviacc.img.pixel_size = 30.0000 enviacc.img.sensor_name = Landsat TM5 ; ; 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 = 0 enviacc.ana.reuse_modtran_calcs = 0 enviacc.ana.use_square_slit_function = 0 enviacc.ana.convolution_method = fft enviacc.ana.use_tiling = 1 enviacc.ana.tile_size = 1024.0000 ; ; Spectral Parameters enviacc.spc.wavelength_units = micron enviacc.spc.lambda = [ 0.4850, 0.5600, 0.6600, 0.8300, 1.6500, 2.2200] enviacc.spc.fwhm = [ -1.000000, -1.000000, -1.000000, -1.000000, -1.000000, -1.000000] enviacc.img.p_input_scale = [ 1.0000, 1.0000, 1.0000, 1.0000, 1.0000, 1.0000] This is the error message! I had try on another PC, it's also failed with the same error message!

    MariM



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    26 Jul 2010 07:21 AM
    Your tile size is very large. Try reducing it to about 400mb. It is an Advanced parameter in the FLAASH dialog.

    Deleted User



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    26 Jul 2010 06:38 PM
    Thanks for your replying, you are right, it's works fine after setting the tile size to 256M. However, the 1024M is the default value of the envi. Why the soft recommend such a value, which will lead to some error?

    MariM



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    27 Jul 2010 07:22 AM
    The default tile size is 100mb. I don't know why yours was set so high.
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