Hi! I have a shapefile loaded in grass, as a 3D Vector:
+----------------------------------------------------------------------------+ | Layer: [EMAIL PROTECTED] | | Mapset: PERMANENT | | Location: altimetria_Porcos | | Database: C:/GRASS GIS DataBase | | Title: | | Map scale: 1:1 | | Map format: native | | Name of creator: plangeo | | Organization: | | Source date: Wed Sep 10 10:31:28 2008 | |----------------------------------------------------------------------------| | Type of Map: vector (level: 2) | | | | Number of points: 6913 Number of areas: 0 | | Number of lines: 0 Number of islands: 0 | | Number of boundaries: 0 Number of faces: 0 | | Number of centroids: 0 Number of kernels: 0 | | | | Map is 3D: 1 | | Number of dblinks: 1 | | | | Projection: Universe Transverse Mercator (zone 0) | | N: 7834144.073 S: 7833041.84504481 | | E: 441953.15895164 W: 440981.71795164 | | B: 0 T: 732.748 | | | | Digitization threshold: 0 | | Comments: | | | +----------------------------------------------------------------------------+ And a column, named "Elevation": column:Elevation description: type:DOUBLE PRECISION len:20 scale:6 precision:18 default: nullok:yes select:yes update:yes 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? Now, I'm trying to interpolate a suface with IDW (very slow...) v.surf.idw [EMAIL PROTECTED] output=teste npoints=12 layer=1 column=elevation --overwrite Another question: what is the precision of this surface? What contour interval can I generate? Regards, Raphael Saldanha BRAZIL
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