Zoom: (Mouse wheel works, too.)
- Nov. 21, 2019: Improved map resolution while mouse not moving.
- Horizontal mouse drag moves the map in east-west direction, and vertical mouse drag moves the map in north-south direction regardless of mouse position or current rotate angle.
- Internet Explorer, Google Chrome, or Safari is recommended. Firefox is slow because of its low performance in canvas 2D path processing.
- The map image can be reused under CC BY-SA 4.0 license, as stated in the image.
- All other parts except D3.js library are copyrighted work by OnTarget Inc. If you have any comment or inquiry, send e-mail to