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<DIV dir=ltr><FONT face=Arial color=#000000 size=2>Hi Simon,</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>did you set the z-exag parameter?</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>Since lat/long data are in decimal degrees while elevation is in meters, you must set the correct value for the z-exag parameter.</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>The transformation from decimal degrees to meters is not univocal, because it depends on the geographic zone you're working on, but we can assume a generic (mean)transformation value and set the z-exag as follows:</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>in the z-exag field type 8.9606e-6 and then enter</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>I hope this helps,</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>Marco</FONT></DIV></DIV>
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<FONT face=Tahoma size=2><B>Da:</B> grass-windows-bounces@lists.osgeo.org per conto di Simon Watkins<BR><B>Inviato:</B> lun 09/06/2008 10.27<BR><B>A:</B> grass-windows@lists.osgeo.org<BR><B>Oggetto:</B> [GRASS-windows] elevation data error?<BR></FONT><BR></DIV>
<DIV>Hi,<BR><BR>New to GRASS, and running native 6.3.0 on windows Vista.<BR><BR>I have downloaded some finished 3 arc sec SRTM data from the National Map Seamless Server in both GeoTIFF and ArcGRID format, however I am having troule in getting it to display as 3D. I imported it via r.in.gdal and this seemed to work, however when I first load the layer it shows in the map display as a single colour block. Clicking 'Map display fills window' seems to show the raster properly, however NVIZ still displays nothing.<BR>Use of the profile tool gives the error 'elevation range for selected raster is zero', and the query tool outputs '(Lat)|(Long)| |211' for any cell. The <A href="http://r.info/">r.info</A> module shows a data type of FCELL and the correct map area and range of data.<BR><BR>Any pointers would be greatly appreciated,<BR><BR>Simon.<BR></DIV></BODY></HTML>