<meta http-equiv="CONTENT-TYPE" content="text/html; charset=utf-8"><title></title><meta name="GENERATOR" content="OpenOffice.org 2.3 (Linux)"> <style type="text/css"> <!-- @page { size: 21cm 29.7cm; margin: 2cm } P { margin-bottom: 0.21cm } --> </style> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2">Hello together !</font></div> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2">I have problems with NVIZ Volume visualization !</font></div> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2">Here I made an example generating a simple 3dgrid volume assuming subterranean data and the failing of visualizing it. I would really appreciate some help ! </font> </div> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2">Here the short workflow:<br><span style="font-weight: bold;">#Generating three
surfaces which will model the volume.</span><br>GRASS 6.2.2 (4326):~ > r.mapcalc dem.t=0<br>GRASS 6.2.2 (4326):~ > r.mapcalc dem.m=-10<br>GRASS 6.2.2 (4326):~ > r.mapcalc dem.b=-20</font></div> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2"><span style="font-weight: bold;">#My region settings</span><br>GRASS 6.2.2 (4326):~ > g.region -p3<br>projection: 3 (Latitude-Longitude)<br>zone: 0<br>datum: wgs84<br>ellipsoid: a=6378137 es=0.006694379990141316<br>north: 24:56:24N<br>south: 12:54S<br>west: 75:52:12E<br>east: 114:17:24E<br>top: 0.00000000<br>bottom: -20.00000000<br>nsres: 0:59:44.842105<br>nsres3: 0:59:44.842105<br>ewres: 1:00:39.789474<br>ewres3: 1:00:39.789474<br>tbres: 1<br>rows: 38<br>rows3: 38<br>cols: 38<br>cols3: 38<br>depths: 20<br>cells: 1444<br>3dcells: 28880<br><br></font> </div>
<div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2"><span style="font-weight: bold;">#Generating the 3d grid volume</span><br>GRASS 6.2.2 (4326):~ > r.to.rast3 input=dem.b,dem.m,dem.t output=dem –o<b> </b></font> </div> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2"><span style="font-weight: bold;">#Visualizing it!</span><br>GRASS 6.2.2 (4326):~ > nviz volume=dem elevation=dem.t<br></font> </div> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2">When visualizing the 3dgrid volume <b>dem,</b> together with the raster surfaces, only outlines in form of a cube volume are drawn whenever <b>navigating in space</b> !!! else nothing is seen but the raster surfaces. </font> </div> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2">When adding a new constant value, for example -10, to the raster volume, an
associated unique colored surface at the bottom of the cube is observable.</font></div> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2">So, I´m not sure about what could be the problem or my mistake in the settings selection.</font></div> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2">Furthermore I would like to know how to change g.region <b>res3,</b> respectivly <b>tbres</b> for latitude longitude locations, when I try to change res3<0:59:44.842105 or tbres my region get's destroyed, definitely.<br>For what stands the default value 1 of tbres ? <br> </font> </div> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2">Could somebody offer more information about vertical resolution specifications for latitude longitude locations.</font></div> <div style="margin-bottom: 0cm; font-family: arial narrow;" align="justify"><font size="2">That
works </font><font size="2">: Slovakia3d can be visualised by adding new constant value for the raster volume. <br><br>Many thanks !<br>Suena</font></div> <p> 
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