Outline from OpenStreetMap. Address resolved with Google Geocoding.
Or tap a real building — no key needed:
Math check
The spec's four sample buildings, computed here in the browser. Expected values are the spec's own.
| Building | Floors | Got | Expect |
|---|
3-minute rule: ft reach = ft/sec × sec ÷ path factor. Coverage sketch only — final placement needs a site walk.