If you query two adjacent polygons, do they both have the same value for the 'diss' attribute?
On Tue, Oct 20, 2009 at 7:05 PM, Roger André <ran...@gmail.com> wrote: > Yeah, kinda long, but here it is. fwiw, I loaded the file into > PostGIS and let it crank away at the dissolve. Was done after about > an hour, so while I'm thrilled to have the correct data, I'd still > like to figure out a solution in GRASS. > >> v.dissolve global_mask out=new_mask col=diss --o > 100% > Building topology for vector map <new_mask_18169>... > Registering primitives... > 5450 primitives registered > 288073 vertices registered > Building areas... > 100% > 2723 areas built > 2721 isles built > Attaching islands... > 100% > Attaching centroids... > 100% > Number of nodes: 5448 > Number of primitives: 5450 > Number of points: 0 > Number of lines: 0 > Number of boundaries: 2727 > Number of centroids: 2723 > Number of areas: 2723 > Number of isles: 2721 > v.reclass complete. 2723 features reclassed. > WARNING: Vector map <new_mask> already exists and will be overwritten > Extracting features... > Building topology for vector map <new_mask>... > Registering primitives... > 5450 primitives registered > 288073 vertices registered > Building areas... > 100% > 2723 areas built > 2721 isles built > Attaching islands... > 100% > Attaching centroids... > 100% > Number of nodes: 5448 > Number of primitives: 5450 > Number of points: 0 > Number of lines: 0 > Number of boundaries: 2727 > Number of centroids: 2723 > Number of areas: 2723 > Number of isles: 2721 > Writing attributes... > Removing duplicate centroids... > Building topology for vector map <new_mask>... > Registering primitives... > 5450 primitives registered > 288073 vertices registered > Building areas... > 100% > 2723 areas built > 2721 isles built > Attaching islands... > 100% > Attaching centroids... > 100% > Number of nodes: 5448 > Number of primitives: 5450 > Number of points: 0 > Number of lines: 0 > Number of boundaries: 2727 > Number of centroids: 2723 > Number of areas: 2723 > Number of isles: 2721 > > > On Tue, Oct 20, 2009 at 1:47 PM, MS <msei...@gmail.com> wrote: >> Is there output for the dissolve command? >> >> Mark >> >> On Oct 20, 2009, at 4:37 PM, Roger André <ran...@gmail.com> wrote: >> >>> Hi all, >>> >>> I'm having trouble creating a single, dissolved feature and exporting >>> it as a multipolygon. Here is what I've done: >>> >>> - layer I started with: >>>> >>>> v.info -t global_mask >>> >>> nodes=5448 >>> points=0 >>> lines=0 >>> boundaries=2727 >>> centroids=2723 >>> areas=2723 >>> islands=2721 >>> faces=0 >>> kernels=0 >>> primitives=5450 >>> map3d=0 >>> >>> - added dissolve field: >>>> >>>> v.db.addcol global_mask col="diss int" >>>> v.db.update global_mask col=diss value=1 >>> >>> - check that diss field is there: >>>> >>>> v.info -c global_mask >>> >>> Displaying column types/names for database connection of layer 1: >>> INTEGER|cat >>> DOUBLE PRECISION|cat_ >>> INTEGER|diss >>> >>> - dissolve: >>> v.dissolve global_mask out=new_mask col=diss --o >>> >>> - inspect new layer: >>>> >>>> v.info -t new_mask >>> >>> nodes=5448 >>> points=0 >>> lines=0 >>> boundaries=2727 >>> centroids=2723 >>> areas=2723 >>> islands=2721 >>> faces=0 >>> kernels=0 >>> primitives=5450 >>> map3d=0 >>> >>> - export layer as shapefile: >>>> >>>> v.out.ogr -p input=new_mask type=area dsn=/tmp olayer=new_mask >>> >>> - check new shapefile: >>> ogrinfo -summary /tmp new_mask >>> INFO: Open of `/tmp' >>> using driver `ESRI Shapefile' successful. >>> >>> Layer name: new_mask >>> Geometry: Polygon >>> Feature Count: 2723 >>> Extent: (-180.000000, -90.000000) - (180.000000, 83.623596) >>> Layer SRS WKT: >>> GEOGCS["GCS_WGS_1984", >>> DATUM["WGS_1984", >>> SPHEROID["WGS_1984",6378137,298.257223563]], >>> PRIMEM["Greenwich",0], >>> UNIT["Degree",0.017453292519943295]] >>> cat: Real (11.0) >>> >>> As you can see, I still have 2723 features, when I expect to have 1. >>> >>> What am I doing wrong? >>> >>> Roger >>> _______________________________________________ >>> grass-user mailing list >>> grass-user@lists.osgeo.org >>> http://lists.osgeo.org/mailman/listinfo/grass-user >> > _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
