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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Sure, I totally agree with that. I think what confused me here was that I knew that the VLR and extrabytes were related (though PDAL does not know
that) and just assumed that the extrabytes would be passed along when adding the writers.las.forward=vlr option. Now that those two things have been decoupled in my mind I think it is very reasonable what PDAL does. And I believe my two initial questions has
been answered very nicely.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">No, it would not make sense change the behavior regarding the LASF_Spec VLR’s<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Yes, I had overlooked the extra_dims option in the las reader/writers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This has been a very fruitful discussion for me. As per Howards suggestion I am working on a tutorial that explains this stuff in more detail and
hopefully others will find this easier in the future.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Kristian<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Fra:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Andrew Bell [mailto:andrew.bell.ia@gmail.com]
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<b>Sendt:</b> 3. oktober 2016 18:19<br>
<b>Til:</b> Kristian Evers<br>
<b>Cc:</b> pdal@lists.osgeo.org<br>
<b>Emne:</b> Re: [pdal] Riegl extrabytes stripped<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Oct 3, 2016 at 9:52 AM, Kristian Evers <<a href="mailto:kreve@sdfe.dk" target="_blank">kreve@sdfe.dk</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#404040;background:#FCFCFC">Ah, there it is!
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#404040;background:#FCFCFC"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#404040;background:#FCFCFC">--readers.las.extra_dims="amplitude=uint16,pulse_width=uint16"</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#404040;background:#FCFCFC"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#404040;background:#FCFCFC">I completely missed that option. I expected PDAL to just transfer the
complete data records when running a basic read-write pipeline, but the way it works makes sense when you think about the format-independent nature of PDAL. It is a bit cumbersome to use the extrabytes in las version earlier than 1.4. For now I am stuck with
version 1.3 and will just have to pay extra attention when reading/writing files.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">It's hard to know what should be handled as the "normal" case. When you're just working with LAS, it seems like PDAL should know what to do, but even then it's not clear. As an example to go with your case, if you're using PDAL to construct
some extra dimension that you wanted written out as extra bytes with each record, you certainly don't want the LAS_Spec/4 VLR forwarded or the existing extra bytes just tacked on. We try to make the common things easy, but sometimes what's common for one
person isn't for others. Perhaps other times we just didn't anticipate well.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">Andrew Bell<br>
<a href="mailto:andrew.bell.ia@gmail.com" target="_blank">andrew.bell.ia@gmail.com</a><o:p></o:p></p>
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