[Liblas-devel] ARSF LiDAR Analysis GUI

Thu Aug 23 06:56:34 PDT 2012

Hi,

I tried earlier on this machine and it did not, although I heavily
suspect that our system-wide installation is sorely outdated. I will
open an issue on github to remind myself to make sure it is capable of
doing so, as performance is certainly an area we would like to improve
in LAG.

I will open an issue now though to remind myself to make that change,
since that seems like a logical thing to do. If there is any other
laslib documentation and tips anywhere then I will be glad to look
through and see if there's any easy changes I can make to improve
performance.

Berin

On 23/08/12 14:39, Martin Isenburg wrote:
> Hi,
>
> sweet. so can LAG readily read LAZ files then?
>
> you can potentially get a lot of speed-up when you load a fenced area
> if you use the simple spatial query functionality through LASindex
> that LASlib provides. lasreader->inside() functions instead of doing
> your own clipping test in line 304 of LoadWorker.cpp
>
>             if (usearea)
>             {
>                 if (!vectorTest(fence.getXs(), fence.getYs(), 4,
>                         reader->point.get_x(), reader->point.get_y()))
>                 {
>                     skip_counter = 0;
>                     continue;
>                 }
>
>             }
>
> instead you would put a
>
> reader->inside_rectangle(fence.getXs()[0], fence.getYs()[0],
> fence.getXs()[1], fence.getYs()[1]);
>
> at the beginning of the reader loop and then LASlib will utilize the
> spatially indexing LAX files should they be present or not give you
> any win otherwise. For the moment you need to dig through code and
> LAStools user forum to learn more about LASindex, but I will present
> the details at this year's ELMF in Salzburg
>
> Cheers,
>
> Martin @rapidlasso
>
> On Thu, Aug 23, 2012 at 6:06 AM, Mark Seibel <mseibel at gmail.com
> <mailto:mseibel at gmail.com>> wrote:
>
>     When I try to compile LAG, I have all components present except
>     lidarquadtree.
>
>     I'm trying to compile the lidarquadtree, and have encountered errors.
>
>     configure error for LAG is:
>     Package requirements (lidarquadtree >=1.2 were not met:  no package
>     lidarquadtree found.
>
>     So I went to the lidarquadtree directory in the lidarsf-lag-53d94dd
>     directory and did ./configure and make.
>
>     Make returned this error:
>     In file included from src/LidarPoint.cpp:34:0:
>     src/LidarPoint.h:38:37: fatal error: laslib/lasdefinitions.hpp: No
>     such file or directory
>     compilation terminated.
>
>     I have the lasdefinitions.hpp file in the laslib directory, but it is
>     in ../lastools/laslib/inc/lasdefinitions.hpp
>
>     How do I make configure aware of this file's location?  I know I'm
>     missing something obvious, but I just cant see it.
>
>     Thanks,
>     Mark
>
>     On Thu, Aug 23, 2012 at 6:18 AM, Berin Smaldon <besm at pml.ac.uk
>     <mailto:besm at pml.ac.uk>> wrote:
>     > As I gather, open source LAS viewers have been in short supply
>     for some
>     > time now, and having been talked about for over a year, we're
>     finally
>     > getting around to announcing a GPL licensed LAS viewer that Mike
>     Grant
>     > has been promising since the dawn of time. For now, this only
>     works on Linux, but
>     > I'm already working on the Windows port, the purpose here being
>     to get
>     > people using the software to attract bug reports, ideas and
>     development.
>     > So, feel free to try and get it working, I'll be interested to
>     know how
>     > it co-operates with other systems.
>     >
>     > Here is the splash page: http://arsf.github.com/lag/
>     >
>     > The link explains what to do to build it for your Linux system
>     if you're so inclined, the Windows port is a bit of a way off yet
>     though, but in the pipeline. If it were useful to enough people, I
>     could potentially be persuaded to work out how to build packages
>     for some Linux package managers too.
>     >
>     > I acknowledge that the quality of the source code is poor in places.
>     > There have been a number of student programmers before me having
>     pretty
>     > much free rein over how the program is structured and what
>     conventions
>     > are used. Documentation and improving the quality of the code is
>     high on
>     > my priority list, but not on the top of it. For now, my e-mail
>     address
>     > and the github page are the best sources of information, and
>     will help
>     > me work out how the github wiki pages could be more useful. In a
>     few months when I'm no longer on the project, whatever e-mail
>     address is on the splash screen or latest version of the software
>     will have to do instead.
>     >
>     > Enjoy,
>     > Berin
>     >
>     >
>     > <br />
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