On Mon, Sep 17, 2012 at 4:48 PM, Clifford Snow <cliff...@snowandsnow.us>wrote:
> I've been doing some work in the North Cascades National Park. It appears > that the border between the US and Canada is wrong. Look at > http://www.openstreetmap.org/?lat=48.9841&lon=-121.743&zoom=13&layers=M > > It appears that the boarder sags to the south. I see tags man_made = > survey_point which would indicate that the border placement is correct. Can > anyone recommend how to validate the border placement? It appears to be correct. If you zoom in on the Bing imagery, you can see that the border coincides with a strip of land that has been cleared of vegetation: the "border vista". If you wanted to further validate it, you could check that the survey points match those published by the Boundary Commission: http://www.internationalboundarycommission.org/coordinates/49thParallel.htm The border does not follow the 49th parallel exactly: http://opinionator.blogs.nytimes.com/2011/11/28/a-not-so-straight-story/ Clearly, some of the other boundaries in the area (e.g. the Mt. Baker - Snoqualmie National Forest multipolygon) are incorrect and should be sharing the same way. John
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