[GRASS-user] Local Relief Model tool

[Vaclav Petras]

Hi Eric,

actually I was working on the same module (named r.local.relief), so we
have some duplication now. It is also based on [Hesse2010]. I was about to
commit it to GRASS Addons but I need to write documentation first. For now,
I'm adding the Python script into a attachment.

I've quickly tested both and they give slightly different results. The
other visible difference is the contours-to-really_smooth_elevation step.
It seems that usage of r.fillnuls is faster than v.surfs. But this might
require more testing as well as the different results do (probably caused
by different elevation reconstruction). We can talk about it off-list if
you prefer or at least on grass-dev list. And of course, we should discuss
some merge of our scripts.

As a side note I want also mention [r.shaded.pca] which I haven't announced
yet but which is already in addons. It is based on [Devereux2010].

Best,
Vaclav

[Hesse2010] Hesse, Ralf (2010): LiDAR-derived Local Relief Models - a new
tool for archaeological prospection. Archaeological Prospection 17:67-72.
[Devereux2008] Devereux, B. J., Amable, G. S., & Crow, P. P. (2008).
Visualisation of LiDAR terrain models for archaeological feature detection.
Antiquity, 82(316), 470-479.
[r.shaded.pca]
https://trac.osgeo.org/grass/browser/grass-addons/grass7/raster/r.shaded.pca


On Wed, Sep 25, 2013 at 10:50 PM, Eric Goddard <egoddard1010 at gmail.com>wrote:

> Hi all,
>
> I've created a grass python script that generates a local relief model
> (LRM) from a high-resolution (such as from LIDAR) DEM based on Hesse, Ralf
> (2010): LiDAR-derived Local Relief Models - a new tool for archaeological
> prospection. Archaeological Prospection 17:67-72.
>
> I've tested it on several data sets of mine and it seems to be working
> fine, however my data is limited to prehistoric Native American mounds. If
> anyone else has some data they can test the tool on and report on the
> results it would be much appreciated. The tool can be downloaded from
> https://github.com/egoddard/r.surf.lrm.
>
> To install in a linux environment, I followed the instructions at
> http://grasswiki.osgeo.org/wiki/GRASS_and_Python#Testing_and_installing_Python_extensions.
> I haven't been able to find solid information on how users who don't
> compile themselves can install an addon that isn't available via
> g.extension. There is
> http://grasswiki.osgeo.org/wiki/Compile_and_Install#Scripts, but I'm not
> sure how that applies to Windows users. Any advice in this area would be
> much appreciated.
>
> As a final note, I adapted this tool based on Rebecca Bennett's bash
> script that was published in her dissertation. Thank you, Rebecca, for
> answering all of my questions and for your efforts in trying to test it out
> :)
>
> Eric
>
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> grass-user at lists.osgeo.org
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>
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