[Liblas-devel] Las2Oci problems

[Martin Isenburg]

hi,

On Fri, Apr 15, 2011 at 6:01 AM, T.J.F. Commandeur
<daboytom101 at hotmail.com>wrote:
>
>  For scientific research I created another kind of Lasblock based on
> spatial finalization by M. Isenburg (spfinalizer).
> This program is able to process larger point clouds and has a low memory
> footprint based on a quadtree structure.
>
> When the program is done it creates either separate las files for every
> block or a las and kdx file.
>

interesting. do you mind sharing your code? i similarly re-used my
spfinalizer code to tile large amounts of LAS points into separate uniform
square LAS tiles with lastile [1]. i know that lasblock strives for balanced
point counts and spatially compact blocks. what was your design goal? does
your code - following the spfinalize strategy - merge the quad-tree cells of
an initially overly detailed quad-tree bottom-up to reach a target
minimum number of points per cell?

[1] http://www.cs.unc.edu/~isenburg/lastools/download/lastile_README.txt

sorry ...cannot help on the Las2Oci questions

cheers,

martin @lastools


>  Now these are created I want to load them to an Oracle spatial SDO_PC
> with Las2Oci.
>
> I am using libLAS from OS4geo on windows, during the usage of Las2Oci I
> found some strange things.
>
>
>
> -          When writing las to a database using a kdx file Las2Oci tends
> to duplicate the last block written to the database (kdx created by
> Lasblock).
>
> -          Las2Oci loads the complete kdx file into memory which seems
> quite insufficient for memory usage. Can’t the kdx be read line by line
> (block by block) instead of completely at once?
>
> -          When executing Las2Oci without a kdx file but with multiple las
> files it creates a new point cloud for every file. There is no option to add
> new blocks to an existing point cloud instead when using multiple las files.
>
>
>
> Is there a solution to these problems? Do I need to change my workflow for
> using Las2Oci to indeed add las files to an existing point cloud in the
> database?
>
>
>
> Kind regards,
>
> Tom Commandeur
>
> _______________________________________________
> Liblas-devel mailing list
> Liblas-devel at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/liblas-devel
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/liblas-devel/attachments/20110415/562ffb48/attachment.html