Opened 8 years ago
Last modified 8 years ago
#3030 closed defect
v. generalize fails to generalize polygons in a random manner — at Initial Version
| Reported by: | dido | Owned by: | |
|---|---|---|---|
| Priority: | major | Milestone: | 7.0.5 |
| Component: | Vector | Version: | 7.0.4 |
| Keywords: | v.generalize | Cc: | dido |
| CPU: | x86-64 | Platform: | MSWindows 7 |
Description
Trying to generalize Greece shoreline + landmass, polygons fishnet'ed with cell size of 5000 m. Random polygons are not being generalized while they should be. If fishnet is made bigger (e.g 50 km cell size), then more non-generalized polygons are visible.
Input is topologically error-free (no overlaps or gaps in input data). v.generalize output is as follows: v.generalize --overwrite input=c100_sea_dis_fish@Greece_UTM output=c100_sea_G120 method=douglas threshold=120 WARNING: Vector map <c100_sea_G120> already exists and will be overwritten Copying features... Building topology for vector map <c100_sea_G120@Greece_UTM>... Registering primitives... 105726 primitives registered 832947 vertices registered Building areas... 36099 areas built 2921 isles built Attaching islands... Attaching centroids... Number of nodes: 36449 Number of primitives: 105726 Number of points: 0 Number of lines: 0 Number of boundaries: 69627 Number of centroids: 36099 Number of areas: 36099 Number of isles: 2921
Generalization (douglas)... Using threshold: 120 meters WARNING: 1953 boundaries were not modified because modification would damage topology WARNING: 1951 lines/boundaries were not modified due to over-simplification
Building topology for vector map <c100_sea_G120@Greece_UTM>... Registering primitives... 105726 primitives registered 323843 vertices registered Building areas... 36099 areas built 2921 isles built Attaching islands... Attaching centroids... Number of nodes: 36449 Number of primitives: 105726 Number of points: 0 Number of lines: 0 Number of boundaries: 69627 Number of centroids: 36099 Number of areas: 36099 Number of isles: 2921
v.generalize complete. Number of vertices for selected features reduced from 796848 to 287744 (36% remaining) (Mon May 09 22:54:11 2016) Command finished (1 min 42 sec)
