Hi Dylan,

At least part of the issue is likely related to this page, and the translation between CANVEC data to the OSM node,way,relation model, which isn't 100% clear cut solution:

https://wiki.openstreetmap.org/wiki/CanVec:_Geometric_Model

By the way, looking at some of the CANVEC data, I do wonder how exactly this data was generated?

This other page: https://wiki.openstreetmap.org/wiki/CanVec:_Vegetation_(VE)

already suggests that some, or most, maybe not surprisingly given the immense size of Canada and the task to manually digitize such data from aerial imagery, is fully automatically derived from e.g. satellite imagery. I do see strange mismatches between actual imagery forest e.g. along streams and rivers, and the data in CANVEC. The data related to forests seems pretty coarse and generalized, and doesn't match imagery very well.

But alas, there is not a lot you can do about that if Natural Resources Canada doesn't deliver better data...

Marco