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Roger and Eran,</div>
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To create a DEM from Pointcloud data using PDAL, you can use the Points2Grid driver. Here’s an example pipeline. You might also want add a filter to select just the last return or the Bare Earth classification if your data is classified.</div>
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For pdal, first create an ascii grid file from (las/pgpointcloud/whatever) using pdal. Then convert to tif via gdal_translate. Then use gdaldem to create the hillshade and color-relief images.</div>
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pdal pipeline point2gridpipe.xml</div>
<div><font face="Calibri,sans-serif">gdal_translate -a_srs epsg:3857 points2grid.asc points2grid.tif</font></div>
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<div>gdaldem hillshade points2grid.tif points2grid_hs.tif -z 5 -az 90</div>
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<div>gdaldem color-relief points2grid.tif colorramp.txt points2grid_cr.tif -co compress=jpeg -co PHOTOMETRIC=YCBCR -co tiled=yes</div>
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Example pipeline:</div>
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<div><?xml version="1.0"?></div>
<div><Pipeline version="1.0"></div>
<div> <Writer type="drivers.p2g.writer"></div>
<div> <Option name="filename”>points2grid</Option></div>
<div> <Option name="grid_dist_x">1</Option></div>
<div> <Option name="grid_dist_y">1</Option></div>
<div> <Option name="output_type">idw</Option></div>
<div> <Option name="output_format">asc</Option></div>
<div> <Filter type="filters.selector"></div>
<div> <Option name="ignore_default">true</Option></div>
<div> <Option name="keep"></div>
<div> <Options></div>
<div> <Option name="dimension">X</Option></div>
<div> <Option name="dimension">Y</Option></div>
<div> <Option name="dimension">Z</Option></div>
<div> </Options></div>
<div> </Option></div>
<div> <Filter type="filters.inplacereprojection"></div>
<div> <Option name="out_srs">EPSG:3857</Option></div>
<div> <Option name="scale_x">1e-05</Option></div>
<div> <Option name="scale_z">1e-05</Option></div>
<div> <Option name="scale_y">1e-05</Option></div>
<div> <Reader type="drivers.las.reader"></div>
<div> <Option name="spatialreference">epsg:26911+4326</Option></div>
<div> <Option name="filename">pointcloudfile.laz</Option></div>
<div> </Reader></div>
<div> </Filter></div>
<div> </Filter></div>
<div> </Writer></div>
<div></Pipeline></div>
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<div>-- </div>
<div>Michael Smith</div>
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<div>US Army Corps</div>
<div>Remote Sensing GIS/Center</div>
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<span style="font-weight:bold">From: </span>Roger Bedell <<a href="mailto:rbedell@coordinatesolutions.com">rbedell@coordinatesolutions.com</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, December 26, 2013 at 5:15 AM<br>
<span style="font-weight:bold">To: </span>Eran Nevo <<a href="mailto:eran@utilis.co.il">eran@utilis.co.il</a>><br>
<span style="font-weight:bold">Cc: </span>"<a href="mailto:pdal@lists.osgeo.org">pdal@lists.osgeo.org</a>" <<a href="mailto:pdal@lists.osgeo.org">pdal@lists.osgeo.org</a>><br>
<span style="font-weight:bold">Subject: </span>[EXTERNAL] Re: [pdal] PDAL and OpenLayers<br>
<span style="font-weight:bold">Resent-From: </span>Michael Smith <<a href="mailto:michael.smith@usace.army.mil">michael.smith@usace.army.mil</a>><br>
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<div dir="ltr">Hello Eran,
<div>Another possibility is to create DEM files from the LIDAR data, then use GDALDEM to create hillshaded tiles. I'm not exactly clear how to create the DEM files however...</div>
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<div>One you have DEM files, I wrote a tool that can create a seamless hillshaded layer for GeoServer, then it is served up to OpenLayers the usual way via GeoServer.</div>
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<div><a href="http://rasternormalizer.codeplex.com/">http://rasternormalizer.codeplex.com/</a><br>
</div>
<div><br>
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<div>Here is the result:</div>
<div><br>
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<div><a href="http://204.62.18.181/OGI/search.aspx?mapcenterlon=-97.670532226558&mapcenterlat=34.802782432797&mapscale=11&Layers=58d1fa5c-6eb4-4b95-9f42-69cd7277e15d%2C4b945341-bc66-4c09-9df4-26fbb58e4a5b%2C&maptype=OLMap">http://204.62.18.181/OGI/search.aspx?mapcenterlon=-97.670532226558&mapcenterlat=34.802782432797&mapscale=11&Layers=58d1fa5c-6eb4-4b95-9f42-69cd7277e15d%2C4b945341-bc66-4c09-9df4-26fbb58e4a5b%2C&maptype=OLMap</a><br>
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<div>Roger</div>
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<div class="gmail_quote">On Wed, Nov 13, 2013 at 5:20 AM, Eran Nevo <span dir="ltr">
<<a href="mailto:eran@utilis.co.il" target="_blank">eran@utilis.co.il</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div style="direction:ltr">Yes , it must be run through browser</div>
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<div class="h5">
<div><br>
On 13 בנוב 2013, at 03:10, Chris Foster <<a href="mailto:chris.foster@roames.com.au" target="_blank">chris.foster@roames.com.au</a>> wrote:<br>
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<blockquote type="cite">
<div><span>Does it need to run in a browser? If not, I've been working on a</span><br>
<span>desktop-based lidar point cloud viewer which might help you out - see</span><br>
<span><a href="http://c42f.github.io/displaz" target="_blank">http://c42f.github.io/displaz</a>. I'm close to a 0.2 release which will</span><br>
<span>include a binary installer for windows.</span><br>
<span></span><br>
<span>Cheers,</span><br>
<span>~Chris</span><br>
<span></span><br>
<span>On 13 November 2013 01:26, Eran Nevo <<a href="mailto:eran@utilis.co.il" target="_blank">eran@utilis.co.il</a>> wrote:</span><br>
<blockquote type="cite"><span>I'm looking for some kind of lidar viewer</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>On 12 בנוב 2013, at 17:15, "Michael P. Gerlek" <<a href="mailto:mpg@flaxen.com" target="_blank">mpg@flaxen.com</a>> wrote:</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Eran-</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>The sheer volume of point cloud data, as Howard says, makes it very hard to</span><br>
</blockquote>
<blockquote type="cite"><span>display in a traditional web browser system, e.g. OpenLayers fed by JSON.</span><br>
</blockquote>
<blockquote type="cite"><span>You'll need to find a way to reduce the point count in a smart way - like</span><br>
</blockquote>
<blockquote type="cite"><span>feeding out a LOD (level of detail) algorithm.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Two or three years ago, people started looking for good ways to do this.</span><br>
</blockquote>
<blockquote type="cite"><span>There might be an open source solution by now, but it would require</span><br>
</blockquote>
<blockquote type="cite"><span>something more heavyweight than just OpenLayers.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>_mpg</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>On Nov 12, 2013, at 7:06 AM, Eran Nevo <<a href="mailto:eran@utilis.co.il" target="_blank">eran@utilis.co.il</a>> wrote:</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Oh , I'm looking for open source solution to show lidar on web application</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>On 12 בנוב 2013, at 16:40, Howard Butler <<a href="mailto:howard@hobu.co" target="_blank">howard@hobu.co</a>> wrote:</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>On Nov 11, 2013, at 12:21 PM, Eran Nevo <<a href="mailto:eran@utilis.co.il" target="_blank">eran@utilis.co.il</a>> wrote:</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Hi there ,</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Can anyone point me to an example how to implement PDAL with OpenLayers ?</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>I have LAS file and PostGIS db with points in them.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Want to try PDAL.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>OpenLayers is a web JavaScript technology. PDAL is a data translation</span><br>
</blockquote>
<blockquote type="cite"><span>software focused on transformations from one format to another. You could</span><br>
</blockquote>
<blockquote type="cite"><span>try using PDAL to export point cloud data to GeoJSON (using</span><br>
</blockquote>
<blockquote type="cite"><span>drivers.text.writer) and importing that into an OpenLayers map in some way.</span><br>
</blockquote>
<blockquote type="cite"><span>You are very likely to overwhelm any browser, however, with any significant</span><br>
</blockquote>
<blockquote type="cite"><span>amount of point cloud data.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Howard</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>_______________________________________________</span><br>
</blockquote>
<blockquote type="cite"><span>pdal mailing list</span><br>
</blockquote>
<blockquote type="cite"><span><a href="mailto:pdal@lists.osgeo.org" target="_blank">pdal@lists.osgeo.org</a></span><br>
</blockquote>
<blockquote type="cite"><span><a href="http://lists.osgeo.org/mailman/listinfo/pdal" target="_blank">http://lists.osgeo.org/mailman/listinfo/pdal</a></span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>_______________________________________________</span><br>
</blockquote>
<blockquote type="cite"><span>pdal mailing list</span><br>
</blockquote>
<blockquote type="cite"><span><a href="mailto:pdal@lists.osgeo.org" target="_blank">pdal@lists.osgeo.org</a></span><br>
</blockquote>
<blockquote type="cite"><span><a href="http://lists.osgeo.org/mailman/listinfo/pdal" target="_blank">http://lists.osgeo.org/mailman/listinfo/pdal</a></span><br>
</blockquote>
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</blockquote>
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-- <br>
Roger Bedell<br>
Coordinate Solutions Inc.<br>
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