[GRASS-dev] GSOC Horizon based voxel interpolation wk 7 checkin

[Benjamin Ducke]

I concur.
Please make sure that your code has been completely
uploaded to the "trunk" folder in your SVN repo.

Also, some sample input data and at least screenshots
of the output that you get would be very helpful.
Preferably, export your result (or a lower resolution
version of it) using r3.out.vtk, zip the VTK file and
upload it to the SVN.

Best,

Ben

On 08/01/2013 08:52 AM, Sören Gebbert wrote:
> Hi Tim,
> Can you please check your commits into your Google code repo? It seems
> to me that there are some parts of your files missing? Besides of that,
> can you please provide manpages for your modules so that we can see what
> they are designed for?
>
> It is important for us to be able to run your modules.
>
> Best regards
> Soeren
>
> Am 01.08.2013 07:28 schrieb "Tim Bailey" <timibly at gmail.com
> <mailto:timibly at gmail.com>>:
>
>     Hi Folks
>     I worked through the weekend, I am going to have limited internet
>     access at the end of the week, and I am working under a rather clear
>     mentor ultimatum, So here is my week 7 report.
>
>     This week I implemented the voronoi operator, that had confounded me
>     for much of July, through a two stage iterative process.  Process A
>     propagates identities vertically up profiles from horizon
>     boundaries. Process B propagates identities horizontally away from
>     the profiles.
>     I applied this to one of my experimental sandboxes that was built
>     for a study of late holocene co-seismic subsidence in a coastal
>     saltmarsh. In this circumstance coastal marshes exhibit extreme
>     sensitivity to their elevation above sea level.  A series of
>     earthquakes during the past 4500 years are recorded by the
>     sedimentary record at the coastal margins. These earthquakes
>     resulted in subsidence events of almost a meter and a half in one
>     episode, and notable movement in several other events. In addition
>     the introduction of tsunami, and mudflat deposits overlaying peat
>     deposits create a very appealing paleo environment to reconstruct
>     using voxel operators.The GRASS region was bound between the deepest
>     core at 6 meters below sea level and 3 meters above, which was
>     clearly out of the range of the modern salt marsh. On my computer
>     with an amd5700 processor, 12gb ram, with ssd, Ubuntu 13.04 and
>     GRASS7,process A takes 12 seconds per iteration,  and process B
>     takes 22 seconds per iteration for a 32,000,000 voxel map. From the
>     data that I am working with process A required 9 iterations and
>     process B required 50 cycles. Region anisotropy was set to 10:1,
>     where it could really comfortably be 100:1.  Nonetheless, this is
>     not that different from the computing demands of moderately large
>     lidar job. Also in this case iteration limits can be used to limit
>     the area of influence of a data point.
>
>     Next week will work on refining this weeks work and implement a
>     surface limit.
>
>     Tim Bailey
>
>
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-- 
Dr. Benjamin Ducke, M.A.
{*} Geospatial Consultant
{*} GIS Developer

   benducke at fastmail.fm