canada

Curvature files are created by analyzing the geometry of highways in the OpenStreetMap dataset to detect curves and ranking each segment based on how many curves there are. The highways are then filtered to include only the most twisty segments in the output. Additional filtering is done to exclude segments marked with surface tags that indicate that they are unpaved. The resulting highways are combined into color-coded KML/KMZ files that can be opened in GoogleEarth or other programs for viewing. See the Using KML Files and Detected Curves KML files pages for more details.

Region Curvature ≥ 1000
Very twisty
Curvature ≥ 300
Moderately twisty
Detected curves
(Curvature ≥ 1000)
Date Updated
alberta c_1000 c_300 c_1000.curves 2021-02-21 23:04 UTC
british-columbia c_1000 c_300 c_1000.curves 2021-02-21 23:14 UTC
manitoba c_1000 c_300 c_1000.curves 2021-02-21 23:19 UTC
new-brunswick c_1000 c_300 c_1000.curves 2021-02-21 23:21 UTC
newfoundland-and-labrador c_1000 c_300 c_1000.curves 2021-02-21 23:25 UTC
northwest-territories c_1000 c_300 c_1000.curves 2021-02-21 23:27 UTC
nova-scotia c_1000 c_300 c_1000.curves 2021-02-22 00:02 UTC
nunavut c_1000 c_300 c_1000.curves 2021-02-22 02:01 UTC
ontario c_1000 c_300 c_1000.curves 2021-02-22 04:19 UTC
prince-edward-island c_1000 c_300 c_1000.curves 2021-02-22 06:00 UTC
quebec c_1000 c_300 c_1000.curves 2021-02-22 08:11 UTC
saskatchewan c_1000 c_300 c_1000.curves 2021-02-22 10:02 UTC
yukon c_1000 c_300 c_1000.curves 2021-02-22 23:01 UTC

Improving the Data

Because Curvature uses the OpenStreetMap -- a world-map that anyone can edit -- as its data source, you too can improve the map and thereby improve the Curvature files the next time they are generated. For more information about improvements that are of particular help to Curvature, please see the Curvature OpenStreetMap page.