[Talk-GB] Village buildings and roads misaligned

[Steven Hirschorn]

I had a very similar issue, where I'd added thousands of houses before
discovering the cadastral layer.

First I'd say that if you go looking for imperfections in any OSM (or for
that matter, Google) data you're on a downward spiral - eg. I mostly mapped
the terraced houses I did as rectangles because I feel that the value of
having
1) the number of buildings,
2) addresses in Nominatim,
3) an impression of the amount of development
was more important than having every bay window and side return mapped.
Others might be horrified by that, but may not be recording the numbers of
storeys in the buildings they map. Or the roof colours.

If all your buildings are recorded with an error of the same offset, I
personally wouldn't worry too much. If you wanted to fix it, I've used JOSM
and set a filter first to select buildings only and then selected and
shifted whole terraces and sometimes streets worth of houses at a time.
It's also worth checking that any POI nodes that should be related to the
buildings are moved too. Then there's the issue of whether roads are
aligned properly. I've been meaning to ask for a while about realigning
roads, I've sometimes realigned minor roads, but am more reluctant to touch
major roads.




On Sat, 11 Dec 2021, 12:18 Pablo Rodríguez, <pablorodriguez.bb at gmail.com>
wrote:

> Hi everyone,
>
> After reading Steven's issue, where he saw misalignment in Isleworth, I
> started to wonder if the editions I did/am doing/will do are correctly
> aligned.
>
> First of all, I'm quite new to talk-gb but not to osm, although I've just
> made small contributions along the years. Last year, I moved to Bar Hill,
> CB, and saw that the village doesn't have addresses, so I started with
> that. In the process, I made some modifications to buildings, always
> aligning to pre-existing buildings against Bing. As editors, I use ID and
> StreetComplete for all the changes.
>
> Last friday, I read https://osmuk.org/cadastral-parcels/, which says "GB
> Cadastral Parcels" layer  "is perfectly aligned* and can be used to realign
> the aerial imagery before mapping" and I could see that buildings and roads
> in the village are misaligned.
>
> So, I have two questions:
> - Can anyone review this?
>     - https://www.openstreetmap.org/#map=15/52.2525/0.0173
> - In case the misalignment is real, how should the procedure be? take the
> time and go one by one?
>
> Thanks and regards,
> Pablo
>
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