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<div class="moz-cite-prefix">On las data I had, the scanned min, max
values were exactly the same as the header. Can't say I check a
lot of data though.<br>
Dave<br>
<br>
<br>
On 12/3/14, 2:11 PM, Kramer, Oscar wrote:<br>
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<div style="direction:ltr; font-family:Tahoma; color:#000000;
font-size:10pt">Hi Andrew,<br>
<br>
JSON would work. <br>
<br>
Re the untrustworthy data: that's a bummer. But perhaps
certain dimensions are more trustworthy than others, and the
user will know which ones are good for specific datasets. In
those cases, getting to the header data is still a worthwhile
effort.<br>
<br>
Oscar<br>
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<div id="divRpF590778" style="direction:ltr"><font size="2"
color="#000000" face="Tahoma"><b>From:</b> Andrew Bell
[<a class="moz-txt-link-abbreviated" href="mailto:andrew.bell.ia@gmail.com">andrew.bell.ia@gmail.com</a>]<br>
<b>Sent:</b> Wednesday, December 03, 2014 11:47 AM<br>
<b>To:</b> Kramer, Oscar<br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:pdal@lists.osgeo.org">pdal@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [pdal] Obtaining "stats" without
reading points<br>
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<div class="gmail_quote">On Wed, Dec 3, 2014 at 9:51
AM, Kramer, Oscar <span dir="ltr">
<<a moz-do-not-send="true"
href="mailto:OKramer@radiantblue.com"
target="_blank">OKramer@radiantblue.com</a>></span>
wrote:<br>
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This is related to Michael's issue post here:
<a moz-do-not-send="true"
href="https://github.com/PDAL/PDAL/issues/569"
target="_blank">
https://github.com/PDAL/PDAL/issues/569</a>.
I need access to min/max bounds on quantities
like intensity values, geographic bounds, etc
(specifically in las files but should be
generalized). I know those values are
available in the las header. Yet it seems that
to obtain these "stats", I need to employ a
stats filter and read all the points. Is there
another mechanism for quickly reading certain
general properties (like bounds) that may be
available from the header?<br>
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I've written the infrastructure to provide what
you're asking, but I don't think I ever hooked it up
to a command-line app. I'll do this shortly. But
in the end, it doesn't matter if you can't trust the
data in the header, as Michael suggests is often the
case. This really is too bad -- not much point in
having the data if it's not correct.</div>
<div class="gmail_quote"><br>
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<div class="gmail_quote">We were talking about
providing JSON output. Would this work for you?<br>
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-- <br>
<div class="gmail_signature">Andrew Bell<br>
<a moz-do-not-send="true"
href="mailto:andrew.bell.ia@gmail.com"
target="_blank">andrew.bell.ia@gmail.com</a></div>
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