feat(geo): cross-check block heights against Mapbox building data (#25)

Merged PR #25: Mapbox building-height cross-check

Co-authored-by: Zwitschi <zwitschi82@gmail.com>

Geo/tools/block_height_report.py

@@ -29,8 +29,13 @@ def classify_height(tags, level_height=LEVEL_HEIGHT):
     rule and the "height tag beats levels beats guess" order are the parts that
     actually decide what the blockout should render.
     """
-    if tags.get("building") == "roof" or tags.get("amenity") == "shelter":
-        kind = "roof" if tags.get("building") == "roof" else "shelter"
+    # Not building volumes: elevated roof/canopy structures and transit shelters.
+    # Found by cross-checking against Mapbox's building data
+    # (Geo/tools/mapbox_buildings.py), which returns roof/canopy/shelter for the
+    # same footprints instead of a storey count.
+    building = tags.get("building")
+    if building in ("roof", "canopy") or tags.get("amenity") == "shelter":
+        kind = building if building in ("roof", "canopy") else "shelter"
         return 0.0, f"not a building volume ({kind})"
     if tags.get("height"):
         return float(tags["height"]), "height tag"