[Talk-ca] Some feedback on import quality in Toronto

[Nate Wessel]

Hi all,

I had a chance this morning to work on cleaning up some of the 
already-imported data in Toronto. I wanted to be a little methodical 
about this, so I picked a single typical block near where I live. All 
the building data on this block came from the import and I did 
everything in one changeset: 
https://www.openstreetmap.org/changeset/66881357

What I found was that:

1) Every single building needed squaring

2) Most buildings needed at least some simplification.

3) 42 buildings were missing.

I knew going in that the first two would be an issue, but what really 
surprised me was just how many sheds had not been imported. There are 
only 53 houses on the block, but 42 sheds/garages/outbuildings, some of 
them quite large, and none of which had been mapped.

I haven't seen the quality of the outbuildings in the source data, and 
maybe I would change my mind if I did, but I think if we're going to do 
this import properly, we're going to have to bring in the other half of 
the data. I had seen in the original import instructions that small 
buildings were being excluded - was there a reason for this?

I also want to say: given how long it took me to clean up and properly 
remap this one block, I'll say again that the size of the import tasks 
is way, way, way too large. There is absolutely no way that someone 
could have carefully looked at and verified this data as it was going 
in. I just spent a half hour fixing up probably about one-hundredth of a 
task square.

We can do better than this!

-- 
Nate Wessel
Jack of all trades, Master of Geography, PhD candidate in Urban Planning
NateWessel.com <http://natewessel.com>

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