I received a shapefile containing data from a topographic survey of a farm. The file has a lot of lines containing elevation data. The person who made the survey did it with a GPS set up on a ATV.
When I load the shapefile in QGIS I have the Metadata :
"Geometry type of the features in this layer: Polygon The number of features in this layer: 1942"
I want to create a slope map from this topo survey. So I guess one of the first steps is to create a raster layer from the vector layer. However before that, I think I have to create a GRASS map with the module v.in.ogr.qgis. When I use this module, I have this message :
Building topology for vector map ... Registering primitives... 0 primitives registered 0 vertices registered Nombre de n�uds : 0 Nombre de primitives : 0 Nombre de points : 0 Nombre de lignes :0 Nombre de contours : 0 Nombre de centro�des : 0 Nombre de surfaces : - Nombre d'�les : - Building topology for vector map ... Registering primitives... 0 primitives registered 0 vertices registered Building areas... 0 areas built 0 isles built Attaching islands... Attaching centroids... Nombre de n�uds : 0 Nombre de primitives : 0 Nombre de points : 0 Nombre de lignes :0 Nombre de contours : 0 Nombre de centro�des : 0 Nombre de surfaces : 0 Nombre d'�les : 0 Successfully finished
The module creates a new map name that I can see when I click on "add a GRASS vector layer". However, there is no layer available for this map.
What's wrong? The problem may come from the original shapefile. Bus as I am not a GIS specialist and I am a new QGIS user, I would like to get some help.
I have QGis 1.8.0-Lisboa, Windows 7 and my computer is a French computer (which could explain why there are some French words in the v.in.ogr.qgis message).