<div dir="ltr"><div dir="ltr">Hi Michael, <div><br></div><div>In line with Harrissou's advice, yesterday I tweeted [1] about an extension to the "Overlap analysis" in QGIS, which works on exactly 2 layers and is called "Overlap analysis by class".</div><div><br></div><div>The outputs are both overlap area and percentage per class. Perhaps it could help you.</div><div><br></div><div>See installation instructions at [2].</div><div><br></div><div><div>Regards, </div><div><br></div><div>Germán</div>-----------</div><div>[1] <a href="https://twitter.com/GeoTux2/status/1491684612086636547" target="_blank">https://twitter.com/GeoTux2/status/1491684612086636547</a><br></div></div><div>[2] <a href="https://github.com/gacarrillor/QGIS-Resources/#installation">https://github.com/gacarrillor/QGIS-Resources/#installation</a></div><div><br></div><div><br></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">El vie, 11 feb 2022 a las 15:49, Harrissou s. (<<a href="mailto:delazj@gmail.com" target="_blank">delazj@gmail.com</a>>) escribió:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Hi,<br>A starting point can also be the Processing "overlaps analysis" algorithm [0] (sorry I don't know how the output actually looks like) followed by some aggregate analysis.<br><br>[0] <a href="https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectoranalysis.html#overlap-analysis" target="_blank">https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectoranalysis.html#overlap-analysis</a><br><br>Regards,<br>Harrissou<br><br><div class="gmail_quote">Le 11 février 2022 17:58:00 GMT+01:00, chris hermansen <<a href="mailto:clhermansen@gmail.com" target="_blank">clhermansen@gmail.com</a>> a écrit :<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr"><div dir="ltr">Michael and list<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Feb 11, 2022 at 8:49 AM Michael Williamson <<a href="mailto:michael@michaelandjane.org.uk" target="_blank">michael@michaelandjane.org.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="EN-GB"><div><p class="MsoNormal">I am sure this is easy but I can’t work out which facility to use<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">I have two layers. Layer A is made up of some large polygons while Layer B is made up of smaller polygons. The Polygons in Layer A overlap one or more of the polygons in layer B. In most cases the overlap is 100% but there are a few cases where the overlap is less than that.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Layer B contains population and other data as numerical attributes and I want to populate corresponding attributes in layer A with the weighted total of the attributes in layer B depending on the amount of overlap.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">I have found various tools but I cannot work out which one to use. The ones I have found seem to do part of the job but not all of it.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"></p></div></div><br></blockquote><div>Probably you want</div><div><br></div><div>Vector > Geoprocessing Tools > Intersection</div><div><br></div><div>That will give you a new layer C with the geometric intersections of your Layer A and Layer B. The attribute table for Layer C will contain the attributes of both A and B.<br></div></div><br clear="all"></div></blockquote></div></div>_______________________________________________<br>
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