I have been googling around for the shapefile that can be used to produce a map of the Pacific ring of fire, e.g. the pink region in the following map. All I could find were the map images, but I need the coordinates of the polygon that defines the boundary of the region. Where can I get hold of such data?
Had a spare twenty minutes so did this.
The white stripe is just where tile servers aren't happy with the EPSG:3832 projection. Hmmm...
Process was: georeference image from wikipedia; load into QGIS; create new shapefile; digitise round ring of fire in image; save.
Zip of the shapefile is here:
You could start with a shapefile of volcanoes and drop the file into QGIS. Then set the projection to EPSG:3832 to give you a Pacific centred map. With the addition of a Natural Earth raster as a backdrop you end up with something like:
From there you just need to sketch in an outline if you need.
Better than volcanoes is the actual plate boundaries, given volcanoes are typically offset from the boundaries and aren't always indicative of a plate boundary (e.g. most volcanic sea mounts). Here's a project that publishes the boundaries and will mean you don't have to draw anything by hand (will work better with multiple map scales):
- Home page: https://nordpil.com/resources/tectonic-plates-gis-data/
- Github: https://github.com/fraxen/tectonicplates
Here's a Github GeoJSON preview of the plates: https://github.com/fraxen/tectonicplates/blob/master/GeoJSON/PB2002_plates.json
Note that the Pacific plate will be segmented by the anti-meridian, so you may encounter standard issues with that.
You will probably want some combination of plate boundary and volcanoes.