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Restore missing route zooms (#1579)

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This PR restores missing transportation_name features that are missing from zoom 11 and improves the mechanism by which transportation_name features are merged through lower zooms. This prevents route features from being dropped due to bridge interleaving (when a bridge interrupts an otherwise continuous route).

This fix moves the length check to a later stage of processing and merges bridges/tunnels if they're too small.  This is similar to the work done in the transportation layer to merge bridges that are too small to render lines.  In this layer, bridges are merged when they're too small to justify a separate label.
This commit is contained in:
Brian Sperlongano
2023-09-14 09:55:01 -04:00
committed by GitHub
parent a7a50d84bc
commit 9de3ff3921
2 changed files with 55 additions and 25 deletions
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6
layers/transportation_name/transportation_name.sql
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@@ -94,7 +94,7 @@ FROM (
NULL::int AS level,
NULL::boolean AS indoor
FROM osm_transportation_name_linestring_gen3
WHERE zoom_level = 7
WHERE ST_Length(geometry) > 20000 AND zoom_level = 7
UNION ALL
-- etldoc: osm_transportation_name_linestring_gen2 -> layer_transportation_name:z8
@@ -116,7 +116,7 @@ FROM (
NULL::int AS level,
NULL::boolean AS indoor
FROM osm_transportation_name_linestring_gen2
WHERE zoom_level = 8
WHERE ST_Length(geometry) > 14000 AND zoom_level = 8
UNION ALL
-- etldoc: osm_transportation_name_linestring_gen1 -> layer_transportation_name:z9
@@ -140,7 +140,7 @@ FROM (
NULL::int AS level,
NULL::boolean AS indoor
FROM osm_transportation_name_linestring_gen1
WHERE zoom_level BETWEEN 9 AND 11
WHERE ST_Length(geometry) > 8000 / POWER(2, zoom_level - 9) AND zoom_level BETWEEN 9 AND 11
UNION ALL
-- etldoc: osm_transportation_name_linestring -> layer_transportation_name:z12