Hi All,<br>I'm new user of Grass and I try to convert my Mapinfo tab files into Grass raster slope map.<br>The oryginal files were non-earth projection (kilometre grid) with isolines stored in column "wysokosci_m".
<br>I've created the new location: XY (unprojected) with nsres=7000 and weres=5000, I've imported data into wysokosci2 vector layer:<br><br>GRASS 6.0.1 (nowa):~/grass/GRASSDATA > <a href="http://v.info" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
v.info</a> -c wysokosci2
<br>Displaying column type for database connection of layer 1:<br>INTEGER|cat<br>CHARACTER|id<br>DOUBLE PRECISION|wysokosc_m<br><br>In accordance to this book: <a href="http://www.gdf-hannover.de/lit_html/grass60_v1.2_en/node64.html" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://www.gdf-hannover.de/lit_html/grass60_v1.2_en/node64.html</a><br>I tried to convert isolines directly to surface using v.surf.rst:<br><br>v.surf.rst input=wysokosci2 layer=1 zcolumn=wysokosc_m dmax=1000.000000 dmin=
825.000000 slope=slope2 zmult=1.0 tension=40. smooth=0.1 segmax=40 npmin=200 <br><br>and I get:<br><br>Warning: there are points outside specified region--ignored 128 points<br>Warning: ignoring 27375 points -- too dense<br>
WARNING: 39 points given for interpolation (after thinning) is less than given NPMIN=200<br>Warning : there is less than 400 points for interpolation, no segmentation is necessary, to run the program faster, set segmax=400 (see manual)
<br>Loading data from attribute table ...<br>The number of points from vector file is 27542<br>The number of points outside of region 128<br><span style="font-weight: bold; text-decoration: underline;">The number of points being used is 39
</span><br><br>The output raster is one big yellow square.<span id="dict2_hidden" style="display: block;"><span class="dictdef"></span></span>I've also tried to decrease the dmin but, in this case:<br><br>Points are too concentrated -- please increase DMIN
<br><br>I'm not sure where I made mistake. I would be very thankfull for any help or maybe existing guide, <br>TXH <br>Mort <br>