<html><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:10pt"><div><span>sure - <br></span></div><div><br><span></span></div>checking whether to use libLAS... yes<br>checking for liblas-config... /usr/bin/liblas-config<br>configure: error: *** Unable to locate libLAS library.<br><br>I have the packages liblas1, liblas-dev, lib-las-bin and python-liblas installed through synaptic and am wondering if there is a libraty package missing?<br><div><br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><div style="font-family: verdana,helvetica,sans-serif; font-size: 10pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Arial" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Markus Metz <markus.metz.giswork@googlemail.com><br><b><span style="font-weight: bold;">To:</span></b> Rebecca
Bennett <rabennett@ymail.com><br><b><span style="font-weight: bold;">Cc:</span></b> "grass-user@lists.osgeo.org" <grass-user@lists.osgeo.org><br><b><span style="font-weight: bold;">Sent:</span></b> Wednesday, 27 July 2011, 13:16<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [GRASS-user] LiDAR LAS import<br></font><br>Rebecca Bennett wrote:<br>> Hello,<br>> Just trying to install GRASS 7 on Ubuntu 10.04 to try out the las import<br>> functions but I'm getting error messages during the configure that it is<br>> unable to find the liblas library, however the liblas library is installed<br>> in usr/bin/lib/ so I'm a bit puzzled...<br><br>Can you post the exact error message? Also, liblas support will only<br>be available if liblas-config exists.<br><br>Markus M<br><br>> Did anyone else get stuck here or am I missing something obvious?<br>> Thanks for reading,<br>> Rebecca<br>><br>>
________________________________<br>> From: Markus Metz <<a ymailto="mailto:markus.metz.giswork@googlemail.com" href="mailto:markus.metz.giswork@googlemail.com">markus.metz.giswork@googlemail.com</a>><br>> To: Hamish <<a ymailto="mailto:hamish_b@yahoo.com" href="mailto:hamish_b@yahoo.com">hamish_b@yahoo.com</a>><br>> Cc: grass-user <<a ymailto="mailto:grass-user@lists.osgeo.org" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a>>; GRASS developers list<br>> <<a ymailto="mailto:grass-dev@lists.osgeo.org" href="mailto:grass-dev@lists.osgeo.org">grass-dev@lists.osgeo.org</a>><br>> Sent: Wednesday, 25 May 2011, 12:48<br>> Subject: Re: [GRASS-user] LiDAR LAS import<br>><br>> On Wed, May 25, 2011 at 12:16 PM, Hamish <<a ymailto="mailto:hamish_b@yahoo.com" href="mailto:hamish_b@yahoo.com">hamish_b@yahoo.com</a>> wrote:<br>>> Markus Metz wrote:<br>>>> Hi
all,<br>>>><br>>>> GRASS 7 has a new module v.in.lidar for importing LiDAR LAS files<br>>>> (*.las or *.laz). The LAS file format is commonly used for storing<br>>>> LiDAR point clouds, but is unfortunately not supported by OGR.<br>>>> v.in.lidar uses the libLAS library [0] and is only compiled if the<br>>>> libLAS library is present.<br>>>><br>>>> I chose to use the library instead of writing a custom LAS reading<br>>>> interface because the current LAS library version 1.6.1 is stable,<br>>>> supports LAS file versions 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, each of<br>>>> which can store LiDAR points in up to 5 different point formats. The<br>>>> user and the interface do not need to know the file version and point<br>>>> format of a given file, all that is conveniently handled by the libLAS<br>>>> library in the background. The
library has Large File Support (LFS)<br>>>> and is well tested on different platforms, also with different<br>>>> endian-ness. This functionality is not that easy to replicate.<br>>>><br>>>> You will need to get the libLAS library and configure GRASS 7 with<br>>>> --with-liblas in order to have the module available. Please test!<br>>>><br>>>> Markus M<br>>>><br>>>> [0] <a href="http://www.liblas.org" target="_blank">http://www.liblas.org</a><br>>><br>>><br>>> neat! any time trials to say how much faster it is than piping<br>>> las2txt | v.in.ascii<br>>> ?<br>><br>> Note that las2txt does NOT apply scale and offset to x,y,z, this would<br>> need to be done afterwards in order to obtain correct coordinates.<br>> Therefore the output of las2txt | v.in.ascii with the sample las file<br>> I used is incorrect.<br>><br>> I
discovered a bug in v.in.ascii: from a point file with | as field<br>> separator like<br>><br>> 1|2|3||5|6<br>><br>> only the first 3 columns will be imported because column 4 is empty<br>> which means that columns 5 and 6 are skipped.<br>><br>> v.in.lidar is a notch faster than las2txt | v.in.ascii. And easier to use...<br>> Speed comparisons:<br>><br>> # sample las file with 1,287,775 points<br>><br>> # with table and topology<br>> time las2txt -i points.las --stdout --parse xyztinrcCpedRGBau<br>> --delimiter "|" | v.in.ascii in=- out=points_ascii -z x=1 y=2 z=3 --o<br>><br>> real 6m34.430s<br>> user 4m57.530s<br>> sys 2m3.693s<br>><br>> time v.in.lidar in=points.las out=points_las -o --o<br>><br>> real 6m13.823s<br>> user 4m32.061s<br>> sys
2m1.068s<br>><br>><br>> # without table, with topology<br>> time las2txt -i points.las --stdout --parse xyz --delimiter "|" |<br>> v.in.ascii in=- out=points_ascii -zt x=1 y=2 z=3 --o<br>><br>> real 1m53.578s<br>> user 1m47.032s<br>> sys 0m9.238s<br>><br>> time v.in.lidar in=points.las out=points_las -ot --o<br>><br>> real 1m44.876s<br>> user 1m34.450s<br>> sys 0m8.488s<br>> _______________________________________________<br>> grass-user mailing list<br>> <a ymailto="mailto:grass-user@lists.osgeo.org" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a><br>> <a href="http://lists.osgeo.org/mailman/listinfo/grass-user" target="_blank">http://lists.osgeo.org/mailman/listinfo/grass-user</a><br>><br>><br>><br>>
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