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List: grass-user
Subject: [GRASS-user] volume query (in Qgis, grass 6.4.3 and grass 7)
From: Vinnie Mitha <vmitha () geoscience ! org ! za>
Date: 2014-06-23 13:47:30
Message-ID: E33F88506B16D04C96E422EA1E9CC0CD556610 () hmc-dag05svr02
[Download RAW message or body]
Hi mailing list
I have a query re: Grass with which I hope you are able to assist (v.6.4.3 =
as standard installation with Qgis 2.2.20 Valmiera).
I would like to calculate volume from an upper and lower DEM (surfaces) but=
this is not working.
I have used both the Qgis interface and the grass GUI (6.4.3) to try and ac=
hieve this. Qgis interface is good but restrictive when applying extras and=
additions (-p/-r/-o). The GRASS GUI (6.4.3 and 7) is also fantastic but se=
ems to lose projection along the way.
I would have thought it would be as practical[?] as:
The sum of all pixels/grid components (DEM-upper minus DEM-lower *surface a=
rea per pixel) OR sum of (voxel volume from lower-DEM to upper-DEM)
To the voxel end I see that the 3-D voxel data processing is not included i=
n 6.* but is in Grass 7 (daily build version).
So, if there are no r3.* capabilities in Grass 6.4.3; which commands would =
one use as a substitute? Would this even apply in the 6.*-series?
Request may be a bit premature but would anyone know of a suitable website =
(or series thereof) that details the progression from 2-D to 3-D and then i=
nto NVIZ iro tutorials/videos?
(I have already seen the GRASS GIS series on YouTube.)
Thanks
Regards
Vinnie
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Hi \
mailing list <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span \
style="font-size:11.0pt"><o:p> </o:p></span></font></p> <p \
class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">I have \
a query re: Grass with which I hope you are able to assist (v.6.4.3 as standard \
installation with Qgis 2.2.20 Valmiera). <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span \
style="font-size:11.0pt"><o:p> </o:p></span></font></p> <p \
class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">I \
would like to calculate volume from an upper and lower DEM (surfaces) but this is not \
working.<o:p></o:p></span></font></p> <p class="MsoNormal"><font size="2" \
face="Calibri"><span style="font-size:11.0pt"><o:p></o:p></span></font></p> <p \
class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">I have \
used both the Qgis interface and the grass GUI (6.4.3) to try and achieve this. Qgis \
interface is good but restrictive when applying extras and additions \
(–p/-r/-o). The GRASS GUI (6.4.3 and 7) is also fantastic but seems to lose \
projection along the way. <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span \
style="font-size:11.0pt"><o:p> </o:p></span></font></p> <p \
class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">I \
would have thought it would be as practical[?] as: <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">The \
sum of all pixels/grid components (DEM-upper minus DEM-lower *surface area per \
pixel) OR sum of (voxel volume from lower-DEM to \
upper-DEM)<o:p></o:p></span></font></p> <p class="MsoNormal"><font size="2" \
face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p> <p \
class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">To the \
voxel end I see that the 3-D voxel data processing is not included in 6.* but is in \
Grass 7 (daily build version). <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">So, \
if there are no r3.* capabilities in Grass 6.4.3; which commands would one use as a \
substitute? Would this even apply in the 6.*-series? <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span \
style="font-size:11.0pt"><o:p> </o:p></span></font></p> <p \
class="MsoNormal"><font size="2" face="Calibri"><span \
style="font-size:11.0pt">Request may be a bit premature but would anyone know of a \
suitable website (or series thereof) that details the progression from 2-D to 3-D and \
then into NVIZ iro tutorials/videos? <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">(I \
have already seen the GRASS GIS series on YouTube.) <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span \
style="font-size:11.0pt"><o:p> </o:p></span></font></p> <p \
class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Thanks \
<o:p></o:p></span></font></p> <p class="MsoNormal"><font size="2" \
face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p> <p \
class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-ZA" \
style="font-size:10.0pt;mso-fareast-language:EN-GB">Regards<o:p></o:p></span></font></p>
<p class="MsoNormal"><b><font size="2" face="Calibri"><span lang="EN-ZA" \
style="font-size:10.0pt;mso-fareast-language:EN-GB;font-weight:bold">Vinnie \
</span></font></b><span lang="EN-US" \
style="mso-fareast-language:EN-GB"><o:p></o:p></span></p> </div>
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