OpenStreetMap

Aaaaargh

Posted by HannesHH on 28 November 2009 in English (English)

If some place is already mapped, please do not blindly "improve" it by re-adjusting everything to Yahoo imagery. It might be that someone spent a lot of time re-, re- and rewalking those paths and that the images are not aligned correctly.

Argh. ARGH. AARRRRGGRGHRHRH!

edit: Is there someone from Yahoo in the community and easily reachable? At Yahoo's maps page there is a feedback link but it requires an Yahoo account (morons...).

Comment from iandees on 29 November 2009 at 00:47

What area are you talking about?

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Comment from HannesHH on 29 November 2009 at 09:44

(Western) Hamburg, Germany.
I already talked with the guy, it's not a big problem. Just made me really sad and angry yesterday.

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Comment from Skippern on 29 November 2009 at 18:49

This constantly happens, maybe it should be posted (on SEVERAL locations) that Yahoo imagery might not be up to date, and only used as a reference if traces and roads are in the area. I never move objects to fit with Yahoo, only add objects (and brush up objects if I know the area myself). Yahoo have allowed me to draw roads in remote locations where it is highly unlikely any mappers goes in the near future.

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Comment from stevage on 30 November 2009 at 07:34

This is a big problem that needs addressing. I'm a one-week newbie, and fell into the trap myself. Suggestions:
1) WARN PEOPLE IN BIG SHOUTY LETTERS wherever there is discussion of how to use imagery. Perhaps even in Potlatch itself. In my case it's Nearmap, not Yahoo.
2) Alert people to the fact you can align the imagery to the existing maps (space+drag in potlatch).
3) Add mechanisms to lock nodes?
4) Add warnings whenever a newbie tries to move existing nodes.
5) Store local imagery offsets? For example, if it's known that in the local area, the yahoo images are off by (3.5, -2.0) metres, then display them that way?

It's a serious problem because it's so hard to correct, and once the newbie discovers what they're doing wrong, they're going to be seriously discouraged from any further fiddling in case they mess up again.

The problem I find is when you're adding new stuff in a mapped area...you can't ignore the imagery, and you can't ignore the existing stuff. I tried just ignoring a mapped bike path, and tracing a building...but the bike path then goes through the building. What can you do? (Other than slide the imagery around as mentioned...but you have to be careful not to let it slide too far)

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Comment from wieland on 30 November 2009 at 19:32

Maybe you don't need to work for Yahoo just register for free ?

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Comment from HannesHH on 30 November 2009 at 20:08

Yes, it is "free". I just don't get why I should have to register an account if I just want to help them. They have a double benefit and I end up with just another account.

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