Map data

Kin Nearby's offline globe and place matching use outlines of counties and cities that come from many public sources. For 25 of them the licence (the Open Data Commons Open Database License, or Creative Commons Attribution-ShareAlike) asks us to share our modified version under the same terms. This page does that.

What we changed

• Each outline was simplified with the Douglas-Peucker algorithm, one area at a time with its shape kept valid, at 0.005 degrees for counties and 0.01 degrees for cities.
• Only each area's outer rings are kept. Interior holes are dropped.
• Parts smaller than 0.00002 square degrees were dropped, except each area's largest part.
• Names were normalized, each area was given the name of the area that contains it, and coordinates are rounded to six decimal places.

Each file is GeoJSON. It carries its source, year, licence and this list of changes inside the file. The outlines are for finding which area a place falls in. They are not survey data.

Licence

Each file below is made available under the licence shown beside it, the same licence its source uses. If you use the files, keep the credit to the source and share your own changes under the same terms. Where the source is OpenStreetMap data, the credit is © OpenStreetMap contributors.

The files

Other sources

The app's other outlines come from sources that do not ask for this (Natural Earth and the US Census Bureau, which are public domain, and national mapping and statistics agencies under open licences). Every source is credited, with its licence, on the Credits screen in the app. See also the privacy statement.