<html><head></head><body><div class="yahoo-style-wrap" style="font-family:verdana, helvetica, sans-serif;font-size:16px;"><div>
<div dir="ltr" data-setdir="false">I have done this with QGIS, if you have a grid with categorised values, QGIS can generate a polygon shapefile with the cell boundaries merged by cell value.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">QGIS uses gdal_polygonize.py under the hood to do this (via a simple GUI interface), so if you work out the command line parameters you need, you could run it from the command line.<span></span><div><br></div></div><div><br></div><div dir="ltr" data-setdir="false">HTH,</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Brent Wood<br></div><div><br></div><div><br></div><div class="ydp6fd40e7byiv0881113880gmail_quote"><div id="ydp6fd40e7byiv0881113880yqt89560" class="ydp6fd40e7byiv0881113880yqt1086676564"><div dir="ltr" class="ydp6fd40e7byiv0881113880gmail_attr">On Fri, 7 Apr 2023 at 10:34, Paul Meems <<a shape="rect" href="mailto:bontepaarden@gmail.com" rel="nofollow" target="_blank">bontepaarden@gmail.com</a>> wrote:<br clear="none"></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;" class="ydp6fd40e7byiv0881113880gmail_quote"><div dir="ltr"><div>Hello List,</div>I'm working on a C# application that uses Golden Software Surfer to create maps, but I also need to export the data to a polygon shapefile. <div>Unfortunately, Surfer creates a shapefile with shapes on top of each other instead of inside each other, and Golden Software support couldn't help with this issue. </div><div><br clear="none"></div><div>I have a grid-file in Surfer Bin Grid format that can be converted to other raster formats, a border shapefile created using ST_Convexhull, and a text file indicating the values of the polygons. </div><div><br clear="none"></div><div><img src="cid:1qsnYN7O6MiawcCnTYsP" alt="image.png" style="width: 480px; max-width: 560px;"><br clear="none"></div><div><br clear="none"></div><div>Can anyone recommend a way to use GDAL/OGR to make a polygon shapefile from these resources, or suggest an alternative approach?<div><br clear="none"></div><div>Regards,</div><div><div><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr">
<br clear="none">Paul<br clear="none"><br clear="none"></div></div></div></div></div></div></div></div></div></div></div>
_______________________________________________<br clear="none">
gdal-dev mailing list<br clear="none">
<a shape="rect" href="mailto:gdal-dev@lists.osgeo.org" rel="nofollow" target="_blank">gdal-dev@lists.osgeo.org</a><br clear="none">
<a shape="rect" href="https://lists.osgeo.org/mailman/listinfo/gdal-dev" rel="nofollow" target="_blank">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a><br clear="none">
</blockquote></div></div>
</div><div id="ydp6fd40e7byahoo_quoted_1762879246" class="ydp6fd40e7byahoo_quoted"><div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;"><div><div class="ydp6fd40e7byqt1086676564" id="ydp6fd40e7byqt39282">_______________________________________________<br clear="none">gdal-dev mailing list<br clear="none"><a shape="rect" href="mailto:gdal-dev@lists.osgeo.org" rel="nofollow" target="_blank">gdal-dev@lists.osgeo.org</a><br clear="none"><a shape="rect" href="https://lists.osgeo.org/mailman/listinfo/gdal-dev" rel="nofollow" target="_blank">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a><br clear="none"></div></div>
</div>
</div></div></body></html>