Add Visvalingam Whyatt Simplifier

[msbarry]

Add a new VWSimplifier that simplifies lines and polygons using the Visvalingam Whyatt algorithm that computes the triangle area formed by each 3 consecutive points and drops points with the minimum area until a certain minArea tolerance is reached. You can use it on features using feature.setSimplifyMethod(SimplifyMethod.RETAIN_EFFECTIVE_AREAS).setPixelTolerance(sqrtOfMinTriangleArea). The pixel tolerance gets squared to compute the min area threshold so that tolerances can be used interchangeably between the default Douglas Peucker (RETAIN_IMPORTANT_POINTS) and VW.

Followups:

• let users specify a GeometryPipeline on features that apply a series of transformations to it in pixel-space so that you can configure the VW parameters more precisely
• add an option to avoid dropping vertices that would create a self-intersection with an existing vertex (see https://www.jasondavies.com/simplify/#pseudocode)
• add an option to only simplify polygons outwards so that it only creates more overlap between adjacent polygons when they get merged

Fixes #1105

[github-actions]

This Branch b2e0fed

Base 292dc78

0:01:11 DEB [archive] - Tile stats: 0:01:11 DEB [archive] - Biggest tiles (gzipped) 1. 14/4942/6092 (157k) https://onthegomap.github.io/planetiler-demo/#14.5/41.82864/-71.40015 (poi:85k) 2. 9/154/190 (144k) https://onthegomap.github.io/planetiler-demo/#9.5/41.77078/-71.36719 (landcover:85k) 3. 10/308/380 (136k) https://onthegomap.github.io/planetiler-demo/#10.5/41.90214/-71.54297 (landcover:66k) 4. 10/308/381 (135k) https://onthegomap.github.io/planetiler-demo/#10.5/41.63994/-71.54297 (landcover:72k) 5. 14/4941/6092 (112k) https://onthegomap.github.io/planetiler-demo/#14.5/41.82864/-71.42212 (poi:64k) 6. 14/4941/6093 (111k) https://onthegomap.github.io/planetiler-demo/#14.5/41.81227/-71.42212 (building:62k) 7. 14/4940/6092 (100k) https://onthegomap.github.io/planetiler-demo/#14.5/41.82864/-71.44409 (building:92k) 8. 11/616/762 (99k) https://onthegomap.github.io/planetiler-demo/#11.5/41.7057/-71.63086 (landcover:71k) 9. 14/4942/6091 (96k) https://onthegomap.github.io/planetiler-demo/#14.5/41.84501/-71.40015 (building:79k) 10. 11/616/761 (95k) https://onthegomap.github.io/planetiler-demo/#11.5/41.83679/-71.63086 (landcover:72k) 0:01:11 DEB [archive] - Max tile sizes z0 z1 z2 z3 z4 z5 z6 z7 z8 z9 z10 z11 z12 z13 z14 all boundary 151 336 409 544 872 332 437 552 802 1.6k 2k 6.9k 6.2k 5.6k 4.5k 6.9k water 7.7k 3.7k 8.6k 5.5k 2.6k 5.1k 15k 18k 16k 26k 15k 13k 17k 15k 12k 26k place 0 0 441 441 441 640 714 1k 1.6k 3.1k 5.7k 3.3k 1.7k 803 948 5.7k landuse 0 0 0 0 549 695 1.6k 6.7k 17k 44k 59k 50k 38k 19k 12k 59k transportation 0 0 0 0 311 774 1.2k 4k 5.6k 17k 13k 17k 62k 47k 33k 62k waterway 0 0 0 0 112 119 0 0 0 3k 2.3k 2k 2.1k 4.9k 2.4k 4.9k park 0 0 0 0 0 0 1.3k 4.3k 9.7k 18k 13k 8.2k 3.7k 3.4k 4.4k 18k transportation_name 0 0 0 0 0 0 287 364 1.1k 1.9k 5.5k 4.7k 3.9k 3.4k 18k 18k landcover 0 0 0 0 0 0 0 9.6k 29k 85k 72k 81k 53k 30k 25k 85k mountain_peak 0 0 0 0 0 0 0 1.1k 1.8k 3.4k 4.3k 2.8k 1.4k 1.4k 869 4.3k water_name 0 0 0 0 0 0 0 0 0 486 461 433 452 1.2k 1.5k 1.5k aerodrome_label 0 0 0 0 0 0 0 0 0 0 666 328 273 221 221 666 aeroway 0 0 0 0 0 0 0 0 0 0 1.6k 2.1k 3k 3.4k 2.8k 3.4k poi 0 0 0 0 0 0 0 0 0 0 0 0 568 565 85k 85k building 0 0 0 0 0 0 0 0 0 0 0 0 0 59k 92k 92k housenumber 0 0 0 0 0 0 0 0 0 0 0 0 0 0 35k 35k full tile 7.9k 4k 9.5k 6.4k 3.7k 6k 20k 40k 82k 195k 182k 135k 113k 128k 247k 247k gzipped 6.2k 3.5k 7.1k 5.2k 3.1k 4.8k 14k 28k 59k 144k 136k 99k 83k 92k 157k 157k 0:01:11 DEB [archive] - Max tile: 247k (gzipped: 157k) 0:01:11 DEB [archive] - Avg tile: 5.4k (gzipped: 4k) using weighted average based on OSM traffic 0:01:11 DEB [archive] - # tiles: 4,115,031 0:01:11 DEB [archive] - # features: 5,518,011 0:01:11 INF [archive] - Finished in 19s cpu:1m11s avg:3.7 0:01:11 INF [archive] - read 1x(3% 0.6s wait:18s done:1s) 0:01:11 INF [archive] - encode 4x(55% 11s wait:2s) 0:01:11 INF [archive] - write 1x(22% 4s wait:13s) 0:01:11 INF [archive] - Finished in 1m12s cpu:3m36s gc:1s avg:3 0:01:11 INF [archive] - FINISHED! 0:01:11 INF [archive] - 0:01:11 INF [archive] - ---------------------------------------- 0:01:11 INF [archive] - data errors: 0:01:11 INF [archive] - render_snap_fix_input 16,675 0:01:11 INF [archive] - osm_multipolygon_missing_way 360 0:01:11 INF [archive] - osm_boundary_missing_way 66 0:01:11 INF [archive] - merge_snap_fix_input 12 0:01:11 INF [archive] - feature_centroid_if_convex_osm_invalid_multipolygon_empty_after_fix 2 0:01:11 INF [archive] - render_snap_fix_input2 1 0:01:11 INF [archive] - omt_fix_water_before_ne_intersect 1 0:01:11 INF [archive] - feature_polygon_osm_invalid_multipolygon_empty_after_fix 1 0:01:11 INF [archive] - feature_point_on_surface_osm_invalid_multipolygon_empty_after_fix 1 0:01:11 INF [archive] - ---------------------------------------- 0:01:11 INF [archive] - overall 1m12s cpu:3m36s gc:1s avg:3 0:01:11 INF [archive] - lake_centerlines 4s cpu:5s avg:1.4 0:01:11 INF [archive] - read 1x(12% 0.5s done:3s) 0:01:11 INF [archive] - process 4x(0% 0s done:3s) 0:01:11 INF [archive] - write 1x(0% 0s done:3s) 0:01:11 INF [archive] - water_polygons 14s cpu:39s avg:2.7 0:01:11 INF [archive] - read 1x(42% 6s done:7s) 0:01:11 INF [archive] - process 4x(26% 4s wait:4s done:5s) 0:01:11 INF [archive] - write 1x(4% 0.5s wait:9s done:5s) 0:01:11 INF [archive] - natural_earth 12s cpu:18s avg:1.6 0:01:11 INF [archive] - read 1x(52% 6s done:5s) 0:01:11 INF [archive] - process 4x(7% 0.8s wait:6s done:5s) 0:01:11 INF [archive] - write 1x(0% 0s wait:6s done:5s) 0:01:11 INF [archive] - osm_pass1 2s cpu:6s avg:3.1 0:01:11 INF [archive] - read 1x(2% 0s wait:2s) 0:01:11 INF [archive] - parse 4x(32% 0.6s) 0:01:11 INF [archive] - process 1x(65% 1s) 0:01:11 INF [archive] - osm_pass2 18s cpu:1m12s avg:3.9 0:01:11 INF [archive] - read 1x(0% 0s wait:10s done:8s) 0:01:11 INF [archive] - process 4x(75% 14s) 0:01:11 INF [archive] - write 1x(2% 0.4s wait:18s) 0:01:11 INF [archive] - ne_lakes 0s cpu:0s avg:0 0:01:11 INF [archive] - boundaries 0s cpu:0s avg:1.4 0:01:11 INF [archive] - agg_stop 0s cpu:0s avg:0 0:01:11 INF [archive] - sort 1s cpu:3s avg:2.6 0:01:11 INF [archive] - worker 1x(52% 0.7s) 0:01:11 INF [archive] - archive 19s cpu:1m11s avg:3.7 0:01:11 INF [archive] - read 1x(3% 0.6s wait:18s done:1s) 0:01:11 INF [archive] - encode 4x(55% 11s wait:2s) 0:01:11 INF [archive] - write 1x(22% 4s wait:13s) 0:01:11 INF [archive] - ---------------------------------------- 0:01:11 INF [archive] - archive 108MB 0:01:11 INF [archive] - features 284MB -rw-r--r-- 1 runner docker 87M Nov 25 11:29 run.jar

0:01:04 DEB [archive] - Tile stats: 0:01:04 DEB [archive] - Biggest tiles (gzipped) 1. 14/4942/6092 (157k) https://onthegomap.github.io/planetiler-demo/#14.5/41.82864/-71.40015 (poi:85k) 2. 9/154/190 (144k) https://onthegomap.github.io/planetiler-demo/#9.5/41.77078/-71.36719 (landcover:85k) 3. 10/308/380 (136k) https://onthegomap.github.io/planetiler-demo/#10.5/41.90214/-71.54297 (landcover:66k) 4. 10/308/381 (135k) https://onthegomap.github.io/planetiler-demo/#10.5/41.63994/-71.54297 (landcover:72k) 5. 14/4941/6092 (112k) https://onthegomap.github.io/planetiler-demo/#14.5/41.82864/-71.42212 (poi:64k) 6. 14/4941/6093 (111k) https://onthegomap.github.io/planetiler-demo/#14.5/41.81227/-71.42212 (building:62k) 7. 14/4940/6092 (100k) https://onthegomap.github.io/planetiler-demo/#14.5/41.82864/-71.44409 (building:92k) 8. 11/616/762 (99k) https://onthegomap.github.io/planetiler-demo/#11.5/41.7057/-71.63086 (landcover:71k) 9. 14/4942/6091 (96k) https://onthegomap.github.io/planetiler-demo/#14.5/41.84501/-71.40015 (building:79k) 10. 11/616/761 (95k) https://onthegomap.github.io/planetiler-demo/#11.5/41.83679/-71.63086 (landcover:72k) 0:01:04 DEB [archive] - Max tile sizes z0 z1 z2 z3 z4 z5 z6 z7 z8 z9 z10 z11 z12 z13 z14 all boundary 151 336 409 544 872 332 437 552 802 1.6k 2k 6.9k 6.2k 5.6k 4.5k 6.9k water 7.7k 3.7k 8.6k 5.5k 2.6k 5.1k 15k 18k 16k 26k 15k 13k 17k 15k 12k 26k place 0 0 441 441 441 640 714 1k 1.6k 3.1k 5.7k 3.3k 1.7k 803 948 5.7k landuse 0 0 0 0 549 695 1.6k 6.7k 17k 44k 59k 50k 38k 19k 12k 59k transportation 0 0 0 0 311 774 1.2k 4k 5.6k 17k 13k 17k 62k 47k 33k 62k waterway 0 0 0 0 112 119 0 0 0 3k 2.3k 2k 2.1k 4.9k 2.4k 4.9k park 0 0 0 0 0 0 1.3k 4.3k 9.7k 18k 13k 8.2k 3.7k 3.4k 4.4k 18k transportation_name 0 0 0 0 0 0 287 364 1.1k 1.9k 5.5k 4.7k 3.9k 3.4k 18k 18k landcover 0 0 0 0 0 0 0 9.6k 29k 85k 72k 81k 53k 30k 25k 85k mountain_peak 0 0 0 0 0 0 0 1.1k 1.8k 3.4k 4.3k 2.8k 1.4k 1.4k 869 4.3k water_name 0 0 0 0 0 0 0 0 0 486 461 433 452 1.2k 1.5k 1.5k aerodrome_label 0 0 0 0 0 0 0 0 0 0 666 328 273 221 221 666 aeroway 0 0 0 0 0 0 0 0 0 0 1.6k 2.1k 3k 3.4k 2.8k 3.4k poi 0 0 0 0 0 0 0 0 0 0 0 0 568 565 85k 85k building 0 0 0 0 0 0 0 0 0 0 0 0 0 59k 92k 92k housenumber 0 0 0 0 0 0 0 0 0 0 0 0 0 0 35k 35k full tile 7.9k 4k 9.5k 6.4k 3.7k 6k 20k 40k 82k 195k 182k 135k 113k 128k 247k 247k gzipped 6.2k 3.5k 7.1k 5.2k 3.1k 4.8k 14k 28k 59k 144k 136k 99k 83k 92k 157k 157k 0:01:04 DEB [archive] - Max tile: 247k (gzipped: 157k) 0:01:04 DEB [archive] - Avg tile: 5.4k (gzipped: 4k) using weighted average based on OSM traffic 0:01:04 DEB [archive] - # tiles: 4,115,031 0:01:04 DEB [archive] - # features: 5,518,011 0:01:04 INF [archive] - Finished in 19s cpu:1m11s avg:3.7 0:01:04 INF [archive] - read 1x(3% 0.5s wait:18s done:1s) 0:01:04 INF [archive] - encode 4x(55% 11s wait:2s) 0:01:04 INF [archive] - write 1x(22% 4s wait:13s) 0:01:04 INF [archive] - Finished in 1m4s cpu:3m29s gc:1s avg:3.3 0:01:04 INF [archive] - FINISHED! 0:01:04 INF [archive] - 0:01:04 INF [archive] - ---------------------------------------- 0:01:04 INF [archive] - data errors: 0:01:04 INF [archive] - render_snap_fix_input 16,675 0:01:04 INF [archive] - osm_multipolygon_missing_way 360 0:01:04 INF [archive] - osm_boundary_missing_way 66 0:01:04 INF [archive] - merge_snap_fix_input 12 0:01:04 INF [archive] - feature_centroid_if_convex_osm_invalid_multipolygon_empty_after_fix 2 0:01:04 INF [archive] - render_snap_fix_input2 1 0:01:04 INF [archive] - omt_fix_water_before_ne_intersect 1 0:01:04 INF [archive] - feature_polygon_osm_invalid_multipolygon_empty_after_fix 1 0:01:04 INF [archive] - feature_point_on_surface_osm_invalid_multipolygon_empty_after_fix 1 0:01:04 INF [archive] - ---------------------------------------- 0:01:04 INF [archive] - overall 1m4s cpu:3m29s gc:1s avg:3.3 0:01:04 INF [archive] - lake_centerlines 2s cpu:5s avg:2.4 0:01:04 INF [archive] - read 1x(20% 0.5s done:2s) 0:01:04 INF [archive] - process 4x(0% 0s done:2s) 0:01:04 INF [archive] - write 1x(0% 0s done:2s) 0:01:04 INF [archive] - water_polygons 14s cpu:39s avg:2.7 0:01:04 INF [archive] - read 1x(42% 6s done:7s) 0:01:04 INF [archive] - process 4x(26% 4s wait:4s done:5s) 0:01:04 INF [archive] - write 1x(4% 0.5s wait:9s done:5s) 0:01:04 INF [archive] - natural_earth 6s cpu:13s avg:2 0:01:04 INF [archive] - read 1x(95% 6s) 0:01:04 INF [archive] - process 4x(13% 0.8s wait:6s) 0:01:04 INF [archive] - write 1x(0% 0s wait:6s) 0:01:04 INF [archive] - osm_pass1 2s cpu:6s avg:3.2 0:01:04 INF [archive] - read 1x(2% 0s wait:2s) 0:01:04 INF [archive] - parse 4x(32% 0.6s) 0:01:04 INF [archive] - process 1x(71% 1s) 0:01:04 INF [archive] - osm_pass2 18s cpu:1m10s avg:3.9 0:01:04 INF [archive] - read 1x(0% 0s wait:10s done:8s) 0:01:04 INF [archive] - process 4x(77% 14s) 0:01:04 INF [archive] - write 1x(2% 0.4s wait:17s) 0:01:04 INF [archive] - ne_lakes 0s cpu:0s avg:0 0:01:04 INF [archive] - boundaries 0s cpu:0s avg:2.5 0:01:04 INF [archive] - agg_stop 0s cpu:0s avg:0 0:01:04 INF [archive] - sort 1s cpu:3s avg:2.6 0:01:04 INF [archive] - worker 1x(54% 0.7s) 0:01:04 INF [archive] - archive 19s cpu:1m11s avg:3.7 0:01:04 INF [archive] - read 1x(3% 0.5s wait:18s done:1s) 0:01:04 INF [archive] - encode 4x(55% 11s wait:2s) 0:01:04 INF [archive] - write 1x(22% 4s wait:13s) 0:01:04 INF [archive] - ---------------------------------------- 0:01:04 INF [archive] - archive 108MB 0:01:04 INF [archive] - features 284MB -rw-r--r-- 1 runner docker 87M Nov 25 11:30 run.jar

Full logs: https://github.com/onthegomap/planetiler/actions/runs/12009047233

[sonarqubecloud]

Quality Gate failed

Failed conditions
11.8% Duplication on New Code (required ≤ 5%)

See analysis details on SonarQube Cloud