“Good” Hills

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Radius 1.5 km Minimum grade 18%

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Measurement baseline 40 m Grade is measured over this distance. Below about 40 m the terrain data's own noise (up to ~3%) starts showing up as fake hills; above ~100 m short steep pitches get averaged away. Discard readings above 38% The steepest streets on record are around 35%, and this terrain data under-reports steep grades rather than over-reporting them. Anything above this is treated as an artifact — an unmapped bridge, a wall, or bad geometry — and dropped. Include paths, trails & stairs