[GRASS-user] v.clean Failed to build area

[Peter Tittmann]

Hi,

I am attempting to use the `rmarea` tool in v.clean with a threshold of ~ 1000 sq meters.

projection is the following:

g.proj -p
-PROJ_INFO-------------------------------------------------
name       : NAD83 / UTM zone 5N
datum      : nad83
ellps      : grs80
proj       : utm
zone       : 5
towgs84    : 0,0,0,0,0,0,0
no_defs    : defined
-PROJ_EPSG-------------------------------------------------
epsg       : 26905
-PROJ_UNITS------------------------------------------------
unit       : meter
units      : meters
meters     : 1



 I am getting a rather cryptic message ‘Failed to build area’. 

> v.clean -c --overwrite --verbose input=plot_pa_with_lidar at 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 at 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
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