<div dir="ltr">Hi!<br><br>I have a shapefile loaded in grass, as a 3D Vector:<br><br><span style="font-family: courier new,monospace;">+----------------------------------------------------------------------------+</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | Layer: pontos2@PERMANENT |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Mapset: PERMANENT |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | Location: altimetria_Porcos |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Database: C:/GRASS GIS DataBase |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | Title: |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Map scale: 1:1 |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | Map format: native |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Name of creator: plangeo |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | Organization: |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Source date: Wed Sep 10 10:31:28 2008 |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> |----------------------------------------------------------------------------|</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Type of Map: vector (level: 2) |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Number of points: 6913 Number of areas: 0 |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | Number of lines: 0 Number of islands: 0 |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Number of boundaries: 0 Number of faces: 0 |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | Number of centroids: 0 Number of kernels: 0 |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | Map is 3D: 1 |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Number of dblinks: 1 |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Projection: Universe Transverse Mercator (zone 0) |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | N: 7834144.073 S: 7833041.84504481 |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | E: 441953.15895164 W: 440981.71795164 |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | B: 0 T: 732.748 |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | Digitization threshold: 0 |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Comments: |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> +----------------------------------------------------------------------------+</span><br>
<br>And a column, named "Elevation":<br><br><span style="font-family: courier new,monospace;">column:Elevation</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">description:</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">type:DOUBLE PRECISION</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">len:20</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">scale:6</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">precision:18</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">default:</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">nullok:yes</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">select:yes</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">update:yes</span><br><br>I need to create countour... so, I think, I must interpolate a surface from this points making something like a DEM, and after, interpolate the contours... Is this correct?<br>
<br>Now, I'm trying to interpolate a suface with IDW (very slow...)<br><br><span style="font-family: courier new,monospace;">v.surf.idw input=pontos2@PERMANENT output=teste npoints=12 layer=1 column=elevation --overwrite</span><br>
<br>Another question: what is the precision of this surface? What contour interval can I generate?<br><br>Regards,<br><br>Raphael Saldanha<br>BRAZIL<br></div>