This is the SVG version of Image:Imperial Palace Tokyo Map.sxd, checked with a GoogleMaps Satellite Image and corrected for proportions.
Notes by the original authoru: 

This is a map of the Imperial Palace in Tokyo (Kokyo), drawn by me based on various sources and satelite pics. Disclaimer: Many locations are only approximate, not all streets, buildings, and waterways are shown, I give no guarantee for accuracy, use at your own risk.
Imperial_Palace_Tokyo_Map.png
Imperial_Palace_Tokyo_Map.png: User:Chris 73
derivative work: ExplicitImplicity (talk)