[Talk-ca] Re-licensing -- a good excuse to rework some data.

[Tyler Gunn]

I've noticed many people are worried about the pending purge of data
from users who has not agreed to the new terms.

There was a large are in Winnipeg contributed by the user VReimer, who
has yet to agree to the new license.  Further, there has been question
in the past where this user obtained the data, and whether it was
legit or not.

So, as an example of what we can accomplish with a bit of effort, I
decided to replace the entire area bounded by St. Mary's Road to the
West, St. Anne's Road to the East, Bishop Grandin to the North, and
the Perimeter Highway to the South.

I'm quite pleased with the results; the road network is smooth and
clean, even at high zoom levels, and best of all it's all legit:
http://www.openstreetmap.org/?lat=49.82032&lon=-97.096&zoom=15&layers=M

I used a combination of:
- Bing imagery, which for the top half of the area was available in
VERY high resolution.  Knowing that Bing is not always aligned well, I
used a combination of city of winnipeg Cadastral polygons (available
from Manitoba Lands Initiative), and the City of Winnipeg 50cm aerial
imagery, which is VERY well aligned to the cadastral data, to re-align
the Bing imagery.
- in the bottom half of the area, only the MLI aerial imagery was
available.  Not as high resolution as Bing, but certainly decent.
- land use areas were derived by overlaying aerial imagery with the
cadastral polygons (showing individual lots and land parcels) , and
then combining them in Quantum GIS into the larger landuse blobs.
- the road network is 100% hand-drawn from re-aligned aerial imagery
- road attributes and surfaces are derived from my knowledge of the
area and the imagery.
- road names are copied from CanVec tiles.

Let me know what you all think.

Tyler