Also available in massive 3840x2400 resolution, or roll your own using the below instructions.
brew install p7zip cairo pixman optipng npm install
If the installation of the node-canvas module fails for you, you can try this after the above:
PKG_CONFIG_PATH=/opt/X11/lib/pkgconfig npm install canvas
To make the above PNG for the entire United States (it’s big!), type
make. Or, to make a TopoJSON file for a specific NHD region, specify a target. For example, California:
This project was inspired by Nelson Minar’s work on a vector river map.