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List: grass-user
Subject: [GRASS-user] r.surf.area
From: Valter Albino <valteralbino () gmail ! com>
Date: 2020-05-29 10:42:49
Message-ID: CANPyY5PUn7g=zfDq3jib060yL19mOOJsrSE1cwZgSXaOh3sKuw () mail ! gmail ! com
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Hi GRASS members
Suppose you compute the "r.surf.area"(1) to some raster file and find that
the 3d area is smaller than your 2d area?
What could be the problem?
Note:
The exercise was done with a 5 m cell size raster file, with 37 km2
watershed with a slope of 0,0341 m/m, within 7.8 version of GRASS GIS 7.8
console in a 3.12.3 QGIS [with this method the difference is higher (12 ha,
comparing with ArcGIS)] and outside QGIS, in GRASS GIS GUI
Thanks in advance
(1) https://grass.osgeo.org/grass78/manuals/r.surf.area.html
Cumprimentos,
*Valter Albino -* Ge=C3=B3grafo F=C3=ADsico, M.Sc.
Modela=C3=A7=C3=A3o H&H / Riscos ambientais / OT&U
www.valteralbino.wixsite.com/hydrodynamics
[Attachment #5 (text/html)]
<div dir="ltr"><div dir="ltr"><div><div><div>Hi GRASS members<br></div>Suppose you \
compute the "r.surf.area"(1) to some raster file and find that the 3d area \
is smaller than your 2d area?<br></div>What could be the \
problem?<br></div><div>Note:<br></div>The exercise was done with a 5 m cell size \
raster file, with 37 km2 watershed with a slope of 0,0341 m/m, within 7.8 version of \
GRASS GIS 7.8 console in a 3.12.3 QGIS [with this method the difference is higher (12 \
ha, comparing with ArcGIS)] and outside QGIS, in GRASS GIS \
GUI<br><div><div><div>Thanks in advance</div><div><br></div><div>(1) <a \
href="https://grass.osgeo.org/grass78/manuals/r.surf.area.html">https://grass.osgeo.org/grass78/manuals/r.surf.area.html</a><br></div><div><br \
clear="all"><div><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div \
dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div \
dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><span \
style="color:rgb(0,0,0)"><font size="1"><span \
style="background-color:rgb(255,255,255)"><span \
style="font-family:arial,helvetica,sans-serif">Cumprimentos,</span></span></font></span><b><span \
style="color:rgb(39,78,19)"><font size="1"><span \
style="background-color:rgb(255,255,255)"><span \
style="font-family:arial,helvetica,sans-serif"><br>Valter Albino \
-</span></span></font></span></b><span style="color:rgb(39,78,19)"><font \
size="1"><span style="background-color:rgb(255,255,255)"><span \
style="font-family:arial,helvetica,sans-serif"><b> </b>Geógrafo Físico, \
M.Sc.<span></span><span></span></span></span></font></span><b><span \
style="color:rgb(39,78,19)"><font size="1"><span \
style="background-color:rgb(255,255,255)"><span \
style="font-family:arial,helvetica,sans-serif"></span></span></font></span></b><br><b><span \
style="color:rgb(39,78,19)"><font size="1"><span \
style="background-color:rgb(255,255,255)"><span \
style="font-family:arial,helvetica,sans-serif"></span></span></font></span></b></div></div><div><span \
style="color:rgb(39,78,19)"><font size="1"><span \
style="background-color:rgb(255,255,255)"><span \
style="font-family:arial,helvetica,sans-serif">Modelação H&H / </span><span \
style="font-family:arial,helvetica,sans-serif">Riscos ambientais / \
OT&U<br></span></span></font></span></div><span style="color:rgb(39,78,19)"><font \
size="1"><span style="background-color:rgb(255,255,255)"><span \
style="font-family:arial,helvetica,sans-serif"><a \
href="http://www.valteralbino.wixsite.com/hydrodynamics" \
target="_blank">www.valteralbino.wixsite.com/hydrodynamics</a></span></span></font></s \
pan><br></div></div></div></div></div></div></div></div></div></div></div></div></div> \
</div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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