On Fri, Apr 27, 2018 at 1:37 AM, Peter Tittmann <[email protected]> wrote: > > Hi, > > I am attempting to use the `rmarea` tool in v.clean with a threshold of ~ 1000 sq meters. > [...] > > I am getting a rather cryptic message ‘Failed to build area’. > > > v.clean -c --overwrite --verbose input=plot_pa_with_lidar@project_area output=plot_pa_rmarea tool=rmarea threshold=1017.2 > -------------------------------------------------- > Tool: Threshold > Remove small areas: 1017.2 > -------------------------------------------------- > WARNING: Vector map <plot_pa_rmarea> already exists and will be overwritten > Using native format > Copying features... > 100% > Rebuilding parts of topology... > Building topology for vector map <plot_pa_rmarea@project_area>... > Registering primitives... > 1720636 primitives registered > 3439992 vertices registered > Building areas... > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > WARNING: Area of size = 0.0 ignored > 100% > 499671 areas built > 6004 isles built > Attaching islands... > 100% > Attaching centroids... > 100% > Topology was built > Number of nodes: 728615 > Number of primitives: 1720636 > Number of points: 0 > Number of lines: 0 > Number of boundaries: 1222309 > Number of centroids: 498327 > Number of areas: 499671 > Number of isles: 6004 > WARNING: Number of incorrect boundaries: 9 > WARNING: Number of duplicate centroids: 14 > -------------------------------------------------- > Tool: Remove small areas > ERROR: Failed to build new area
I guess the problem are these 9 incorrect boundaries. Which GRASS version are you using? Can you try again with the latest release in case you are not using the latest release? Markus M
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