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<p class="MsoNormal">Hi everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am having difficulty with pansharpening Landsat 8 imagery using this tutorial:
<a href="http://planet.qgis.org/planet/tag/landsat/">http://planet.qgis.org/planet/tag/landsat/</a>. I am able to create a natural color image, but the pansharpening results in images with distorted colors.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here are the steps that I have followed:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Import all Landsat 8 bands to GRASS 7.0.4<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>r.in.gdal input=C:\Users\Michele\Desktop\LC81100362016082LGN00\LC81100362016082LGN00_B1.TIF output=LC81100362016082LGN00_B1 -k -e<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Converted digital number data to reflectance using i.landsat.toar<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>i.landsat.toar input=LC81100362016082LGN00_B output=LC81100362016082LGN00_refl metfile=C:\Users\Michele\Desktop\LC81100362016082LGN00\LC81100362016082LGN00_MTL.txt sensor=oli8 date=2016-03-22<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Color balanced using i.colors.enhance for bands 4, 3, 2 as RGB respectively<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>i.colors.enhance red=LC81100362016082LGN00_refl4@Osaka green=LC81100362016082LGN00_refl3@Osaka blue=LC81100362016082LGN00_refl2@Osaka<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Displayed RGB map using bands 4, 3, 2 (I get a really great natural color image)<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Pansharpened bands 4, 3, 2 using band 8 as the panchromatic band with the IHS method<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>i.pansharpen red=LC81100362016082LGN00_refl4@Osaka green=LC81100362016082LGN00_refl3@Osaka blue=LC81100362016082LGN00_refl2@Osaka pan=LC81100362016082LGN00_refl8@Osaka output=LC81100362016082LGN00_ihs method=ihs<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">6.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Displayed RGB map with the “pansharpened” bands for 4, 3, 2<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">7.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Result: An image that is entirely gray (I found this link that says to use i.fusion.hpf, but following those instructions, I get “'make' is not recognized as an internal or external command, operable program or batch file.”
<a href="http://gis.stackexchange.com/questions/111763/pan-sharpen-landsat-8-using-grass-7">
http://gis.stackexchange.com/questions/111763/pan-sharpen-landsat-8-using-grass-7</a> Am I supposed to use the GUI for this?)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">From searching online, I have found that the i.pansharpen module doesn’t take 16 bit imagery (which Landsat imagery is) but rather 8 bit. I found this link (<a href="http://gis.stackexchange.com/questions/39174/how-to-color-balance-false-composites-of-pan-sharpened-landsat-images-in-grass/67319#67319">http://gis.stackexchange.com/questions/39174/how-to-color-balance-false-composites-of-pan-sharpened-landsat-images-in-grass/67319#67319</a>)
that says to rescale the image. I attempted this twice:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>When I run it on the bands produced after running the i.landsat.toar module, I get numbers such as min=-0.00813278402972343 and max=1.58301384751301. After rescaling the images to 0-255 and proceeding with step 3 I end up with an entirely
white image. <o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>However, if I rescale the original bands which all have ranges of 0-65535, to 0-255, then pansharpen, the result is a washed out version of the natural color image. I believe this has been pansharpened, but the colors are off. I also
attempted to color balance the pansharpened bands but was unsuccessful as well.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Am I rescaling the images incorrectly or is there another step I am getting wrong? Any guidance would be greatly appreciated.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Michele Toma<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><a href="mailto:michele.toma@airborne.aero"><span style="color:blue">michele.toma@airborne.aero</span></a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><a href="www.airborne.aero"><span style="color:blue">www.airborne.aero</span></a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#1F497D"><img border="0" width="133" height="36" id="Picture_x0020_1" src="cid:image001.jpg@01D1DD20.270DC1C0" alt="New Small2"></span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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