[Talk-ca] Canvec alignment - careful when merging tiles!

[Tyler Gunn]

I know it has been suggested to use the JOSM validator to find duplicate nodes and "fix" them to join adjacent canvec tiles.  I wanted to add that we should be manually inspecting the tile boundaries because I've run into situations where:
- Roads are just ever so slightly off, meaning they never did merge with the "fix duplicates".
- Areas that you can't join using the SHIFT-J  "Join overlapping areas" because the nodes don't line up.

For example: 
http://www.egunn.com/gallery2/d/29208-1/canvec_alignment.jpg

This is pretty easy; just select the offending node at the bottom, manually Merge them, and then Shift-J to join the two areas.
For roads, you can just merge the nodes and you're good.  A quick litmus test to see if two roads were merged properly is to select both ways and try to combine them.  If it says you can't combine them, then the nodes didn't merge.

Have fun!

Tyler

--
Tyler Gunn
tyler at egunn.com
http://www.egunn.com/