<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Mort,<DIV>Are you sure that you input data is cartesian (ie XY unprojected) and not Geographic (lat/long which is also unprojected). It would be very unusual to have unprojected vector data in a cartesian coordinate system.</DIV><DIV>I think that what has happened is that you coordinates are in lat/long which would cause all your data to be bunched up in a tiny little space as the min/max for lat/long is +90 to -90 and +180 to -180 respectively.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Cheers,</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Mike</DIV><DIV><BR><DIV><DIV>On 26-Sep-06, at 4:56 PM, mort wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite">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><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">grassuser mailing list</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><A href="mailto:grassuser@grass.itc.it">grassuser@grass.itc.it</A></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><A href="http://grass.itc.it/mailman/listinfo/grassuser">http://grass.itc.it/mailman/listinfo/grassuser</A></DIV> </BLOCKQUOTE></DIV><BR></DIV></BODY></HTML>