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    Hoi Paul,<br>
    <br>
    Kijk eens hier:<br>
    <br>
<a class="moz-txt-link-freetext" href="http://gis.stackexchange.com/questions/120/make-the-nodata-area-of-a-resampled-orthophoto-overview-white/129#129">http://gis.stackexchange.com/questions/120/make-the-nodata-area-of-a-resampled-orthophoto-overview-white/129#129</a><br>
    <br>
    Is niet de methode om cutlines te maken, maar misschien wel een
    manier om te voorkomen dat je de bijna witte pixels krijgt.<br>
    <br>
    Groet,<br>
    Raymond<br>
    <br>
    <div class="moz-cite-prefix">On 04/03/2013 04:07 PM, Edward Mac
      Gillavry wrote:<br>
    </div>
    <blockquote cite="mid:DUB115-W639B1788F458866F6AF1D0D7D80@phx.gbl"
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      <div dir="ltr">Ha Paul,<br>
        <br>
        Als cutline parameter kan je een shapefile opgeven die je
        gebruikt als masker. Deze kan je met iedere willekeurige desktop
        gis tekenen met de raster als guide op een laag eronder.<br>
        <br>
        Groet,<br>
        <br>
        Edward<br>
        <br>
        <hr>From: <a class="moz-txt-link-abbreviated" href="mailto:p.meems@topx-group.nl">p.meems@topx-group.nl</a><br>
        Date: Wed, 3 Apr 2013 15:27:48 +0200<br>
        To: <a class="moz-txt-link-abbreviated" href="mailto:dutch@lists.osgeo.org">dutch@lists.osgeo.org</a><br>
        Subject: [Dutch] Buitengrens luchtfoto bepalen<br>
        <br>
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                    <div>
                      <div>Ik heb een luchtfoto van een gemeente in
                        ECW-formaat, die ik wil gebruiken in Geoserver.<br>
                        Daarvoor moet ik die converteren naar GeoTiff en
                        dan compressie (JPEG) en overviews toepassen.<br>
                      </div>
                      Dit proces voer ik uit met GDAL tools en gaat
                      prima.<br>
                    </div>
                    Alleen de luchfoto is niet geheel vierkant, hierdoor
                    heb ik witte vlakken in de hoeken.<br>
                  </div>
                  Door de compressie worden deze witte vakken niet meer
                  effen wit. Visueel is dit niet te zien, maar wel als
                  je de transparante kleur op wit zet. Dan blijven er
                  allemaal wittige vlekjes over.<br>
                </div>
                <div>Met nearblack.exe kan ik dat een heel eind
                  oplossen, maar niet 100%.<br>
                </div>
                <div><br>
                </div>
                In gdal_translate kan ik ook een cutline meegeven.
                Daarmee kan ik na de compressie en overviews de tiff
                knippen en worden de pixels weer netjes wit (nodata
                value).<br>
                <br>
              </div>
              Het probleem zit in het maken van die cutline. <br>
            </div>
            Weet iemand van jullie een tool waarmee ik dat kan doen?<br>
          </div>
          Uiteraard het liefste Open-Source maar dat hoeft niet.<br
            clear="all">
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                            <p style="" lang="nl-NL">Met vriendelijke
                              groet,<br>
                            </p>
                            <br>
                            <br>
                            Paul Meems<br>
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                                    <p style=""><span
                                        style="color:#000000;"><b>Paul
                                          Meems<br>
                                        </b></span><span
                                        style="color:#808080;">Senior
                                        GIS consultant</span></p>
                                    <p style=""><span
                                        style="font-size:x-small;">06-53989481</span><br>
                                      <a moz-do-not-send="true"
                                        title="TopX Geo-ICT"
                                        href="http://www.topx-geo-ict.nl"
                                        target="_blank">TopX Geo-ICT</a><br>
                                      <span style="color:#000000;"><a
                                          moz-do-not-send="true"
                                          title="http://topx-group.nl/topx-geo-ict"
href="http://topx-group.nl/topx-geo-ict" target="_blank"><br>
                                        </a>Wij bieden ondersteuning</span></p>
                                    <p style=""><span
                                        style="color:#000000;">voor <a
                                          moz-do-not-send="true"
                                          title="MapWindow GIS - Open
                                          Source"
                                          href="http://www.mapwindow.org/"
                                          target="_blank">MapWindow GIS</a></span><br>
                                      <span style="color:#888888;"></span></p>
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      <pre wrap="">_______________________________________________
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    <br>
    <pre class="moz-signature" cols="72">-- 
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