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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-ligatures:none;mso-fareast-language:FR">Hello.<br>
My goal is to generate a relevant segmentation that would delimit the main physiopnomic units (homogenous areas). Up to now, I have done several tests with qgis and orfeotoolbox 9 with the OTB Generic Region merging module :
<a href="https://www.orfeo-toolbox.org/CookBook-7.0/Applications/app_GenericRegionMerging.html" target="_blank">
<span style="color:blue">GenericRegionMerging — Orfeo ToolBox 7.0.0 documentation</span></a> with those folowing settings<o:p></o:p></span></p>
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<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span style="mso-ligatures:none;mso-fareast-language:FR">input image : spot 6/7 satelite image (band blue, green, red, near infrared)<br>
or Aerial french mapping agency images (50 cms bd ortho with green, red and near infrared).<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span style="mso-ligatures:none;mso-fareast-language:FR">Homogenity criterion to use : Baatz & Schape<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span style="mso-ligatures:none;mso-fareast-language:FR">Threshold for the criterion : 500<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span style="mso-ligatures:none;mso-fareast-language:FR">Number of iterations`: 0<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span style="mso-ligatures:none;mso-fareast-language:FR">Weight for the spectral homogeneity : 0.1<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span style="mso-ligatures:none;mso-fareast-language:FR">Weight for the spatial homogeneity : 0.1<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-ligatures:none;mso-fareast-language:FR">The result is rather interesting for certain areas, in particular crops areas, without too much vegetation. on the other
hand, the method does not seems optimal, in particular for forest areas.<br>
I’m taking the liberty to paste some screenshots :<br>
the first SS showing interesting result on crop areas :<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-ligatures:none;mso-fareast-language:FR"><img border="0" width="216" height="163" style="width:2.25in;height:1.6979in" id="_x0000_i1026" src="cid:image001.png@01DB8D19.9DA95260"></span><span style="mso-ligatures:none;mso-fareast-language:FR"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-ligatures:none;mso-fareast-language:FR">A second SS showing the non relevant result on forest areas :
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-ligatures:none;mso-fareast-language:FR"><img border="0" width="221" height="148" style="width:2.302in;height:1.5416in" id="Image_x0020_1" src="cid:image002.png@01DB8D19.9DA95260"></span><span style="mso-ligatures:none;mso-fareast-language:FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-ligatures:none;mso-fareast-language:FR">Perhaps for these forest areas, the color/spectral criterion is not relevant. It would be better to generate / integrate texture information? As far as i understood, this GRM OTB
module is based only on spectral/colour criterion but not take into consideration texture information.<br>
Are there other qgis/grass/ orfeotoolbox or whatever other segmentation module that takes into account not only the color criterion (spectral) but also texture information?<br>
If this is not the case, should i create some kind of new raster (add a band to my existing color infrared raster) dedicated to texture and/or ndvi information?<br>
Thanks so much for your guidances.</span><o:p></o:p></p>
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