<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jun 29, 2020 at 1:20 PM Stephen V. Mather <<a href="mailto:svm@clevelandmetroparks.com">svm@clevelandmetroparks.com</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">
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Ha! Ok, my gut was right. Rasters it is.<br>
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And by massive, I just mean 80k images worth of photogrammetric point clouds over 300km2. I know I estimated how many points that is at one point, but I don't recall now.
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<span style="font-family:Helvetica,sans-serif"><strong>Stephen V. Mather</strong></span><br style="font-family:Helvetica,sans-serif">
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<div id="gmail-m_7317001894122031503divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Howard Butler <<a href="mailto:howard@hobu.co" target="_blank">howard@hobu.co</a>><br>
<b>Sent:</b> Monday, June 29, 2020 12:50 PM<br>
<b>To:</b> Stephen V. Mather <<a href="mailto:svm@clevelandmetroparks.com" target="_blank">svm@clevelandmetroparks.com</a>><br>
<b>Cc:</b> pdal <<a href="mailto:pdal@lists.osgeo.org" target="_blank">pdal@lists.osgeo.org</a>><br>
<b>Subject:</b> Re: [pdal] Digitized building footprints</font>
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<div>On Jun 29, 2020, at 10:18 AM, Stephen V. Mather <<a href="mailto:svm@clevelandmetroparks.com" target="_blank">svm@clevelandmetroparks.com</a>> wrote:</div>
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Hi All,</div>
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I am processing a dataset for which I have a digitized building footprints. It'd be even cooler if I had vegetation, but beggers != choosers.</div>
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In principle, I could use filters.overlay, but this is a massive dataset, so I am curious if it makes more sense to rasterize, tile things up, and use filters.colorization.</div>
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<div>Define massive ;)</div>
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<div>I think your instinct to rasterize the footprints is the right one here. filters.overlay is going to do point-in-polygon for every point/poly combo. Most are quickly thrown out, but you're going to be checking every one. A raster mask is going to be much
quicker, and you can control the resolution with gdal_rasterize.</div></div></div></div></blockquote><div><br></div><div>I don't know why you wouldn't use the overlay/range option. I don't know any reason why this would be slow and it seems simple.</div><div><br></div></div>-- <br><div dir="ltr" class="gmail_signature">Andrew Bell<br><a href="mailto:andrew.bell.ia@gmail.com" target="_blank">andrew.bell.ia@gmail.com</a></div></div>