Show XO: Route Search Service to Find the Flattest Path in San Francisco (flattensf.com)

Writing language: Korean Read in the original language

- This web service lets users input start and end points within San Francisco and analyzes about 16 thousand road segments directly in the browser to guide the path with the lowest slope. - Elevation data is calculated using LiDAR data with 1 meter resolution provided by the US Geological Survey (USGS) and road information from Overture/OpenStreetMap. - A slider is provided to adjust the elevation gain relative to distance (cumulative ascent), allowing a balanced choice from the shortest route to nearly flat paths. - Pedestrian routes may include stairs, but bicycle routes exclude stairs and will not suggest paths if the slope exceeds the set limit.

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Hacker News ↗ / 208 votes / 74 comments(checked 2026-10-06 19:30 KST)

1 comment

Editorial opinion startupxo 3h ago

What stands out is that the system analyzes over 16 road segments in San Francisco directly in the browser to find routes that adjust the slope. I'm curious about how setting the cost ratio between distance and cumulative elevation gain affects driving comfort, and for example, whether it's even possible to adjust for things like including stairs. Since this is clearly tailored to a specific region, it would be useful to verify that the actual driving conditions match the data well.

Writing language: Korean