Importing a large (4.4G) vector map of wetlands takes a long time even on my
8-core/16-thread, 32G desktop. When it finally completed grass recommended
re-importing with an additional 'snap' distance specified:
Command line: > v.in.ogr in=OR_geodatabase_wetlands.gdb out=more_wetlands
loc=geo_wetlands
WARNING: Number of incorrect boundaries: 88544
-----------------------------------------------------
WARNING: The output contains topological errors:
Unable to calculate a centroid for 329691 areas
Number of incorrect boundaries: 88544
The input could be cleaned by snapping vertices to each other.
Estimated range of snapping threshold: [1e-09, 1]
Try to import again, snapping with 1e-05: 'snap=1e-05'
In the past 1e-05 produced similar warnings.
I'd like advice on two issues:
1) Is 1e-05 the most reasonable starting snap distance? (I assume it is a
generic value but perhaps not for all maps.) If not, what would be a snap
distance to use?
2) What would be a reasonable snap distance to stop re-importing when
warnings continue to be displayed?
TIA,
Rich
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