[Imports] Ottawa, Canada Tree Import

[Rory McCann]

On 28/06/17 16:53, Kyle Nuttall wrote:
> I am still a little confused by what you mean. Obviously if there's a
>  tree in the middle of a building, that means something is not right.
> But what I was trying to say was that the trees in this dataset will
> only appear where an actual tree is in real life. There shouldn't be
> any cases of rogue trees in the middle of rivers or buildings because
> a tree just wouldn't be there in real life.

What if OSM data is wrong? What if OSM says "The river bank goes up to
here" and it doesn't, and that would make the tree in the river.
Sometimes people just upload data into OSM without checking for things
like this, and you get these weird data problems. You should try to
figure where (if at all) this happens, and see if the problem is OSM or
the official data.

You're also presuming the official data is 100% guaranteed to have the
correct location. If they are 99.9% accurate, then there are 150 wrong
locations. 99.99% accurate, 15 wrong locations.

If you do this sort of analysis you can find out just how accurate the
official data is, and also prevent making the map be full of these mistakes.