Hey look I made a map!
Click on the animated version NOW
The D3 code and GeoJSON is here. It is based on Noah Veltman’s example of the California coast. Thanks Noah!
I generated the borders of contiguous San Francisco (man we have a lot of islands) via the shapefile from SFgov and a lot of clicking in QGIS. (It included piers that no longer exist!)
Here’s the rotated version.