Dir you try to do a color balance on the corrected images? It's been a while since I've done this but I believe i.colors.enhance should do it. https://grass.osgeo.org/grass70/manuals/i.colors.enhance.html
On Sun, Nov 15, 2015 at 12:57 AM, iat bd <[email protected]> wrote: > Date: November 15, 2015 > > > Hi All, > > > Following are my procedure, observation and question/ request: > > > Data Source: Earth Explorer Landsat 8 > > Grass GIS Version: 7.0.2 RC1 > > Windows 7 32 bit OS > > > I have been trying to conduct an Atmospheric correction using the Grass > wiki reference > > https://grasswiki.osgeo.org/wiki/Atmospheric_correction > > https://grass.osgeo.org/grass64/manuals/i.atcorr.html > > https://grass.osgeo.org/grass64/manuals/i.landsat.toar.html > > > Step 01: > > > I skipped using the Toar Tool and used Raster map calculator to generate > > a). Reflectance = REFLECTANCE_MULT_BAND_X*DN + REFLECTANCE_ADD_BAND_X > > b). Reflectance with correction of sun angle = Reflectance/ Sin(Ɵ) > > > Step 02: > > > Plugged in to i.atcorr the Reflectance bands generated at Step 01 for band > 4, 3, 2 amd 8 along with their respective control file. > > > Step 03: IHS Pan Sharpened band 4,3,2 with band 8 > > > Step 04: Generated a RGB composite using Red = band 4, Green = band 3 and > Blue = band 2. > > > I am attaching the resultant image and original unadjusted 432 composites > for comparison. Obviously, I missed something. Atmospherically adjusted > Image should’ve been clearer. Its not even looking like an RGB image. > > > Also attaching the Command outputs so that you may follow my steps, to > notice if there was anything unusual and a control file for reference. I > used Tropical Atmospheric model and Urban Aerosol model. The values used in > the control file were collected from Atmospheric correction wiki. > > > I’ll appreciate it if anyone of you can share your insight and tell me how > I can get a correct atmospherically adjusted image. Also, I noticed there > is no longer any i.landsat.dehaze extension available. Could you please > tell me how dehazing may be possible absent the extension? > > > Do let me know if there is anything missing or not clearly explained. > > > > Thanks in advance. > > > > Regards, > > > > Imtiaz > > > > > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user >
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