[Talk-GB] Offsets between OS and OSM data (was Building with mapseg)

[Jason Cunningham]

I'm in London and using the method, linked to by Kevin, the VectorDistrict
looks very good. I also converted to kml to see how some some of the old
docks near sea level matched up in google earth and I was more than happy.
Overlaying Vector District and 'StreetView tiles' in Josm indicates the
Streetview tiles can be off in places

Jason

On 30 May 2010 10:09, Kevin Peat <kevin at kevinpeat.com> wrote:

> I'm in Devon and I see the same thing although whether it is just the SW I
> don't know.
>
> The Streetview tiles (as I see them in JOSM) are all offset to the SE by
> 5-10 metres. I've converted some woods in my area from the VectorDistrict
> data using this process,
>
>     http://wiki.openstreetmap.org/wiki/Using_OS_Shapefiles
>
> and the converted data looks good to me compared to my previous surveys but
> comes out different to the tiles, so I'm thinking that the tiles are wrong.
>
> Kevin
>
>
>
>
>
> On 30 May 2010 09:08, Tim François <sk1ppy14 at yahoo.co.uk> wrote:
>
>> > On a side note, has anybody noticed a consistent tendency
>> > for existing
>> > independently surveyed roads to be offset northwards (by
>> > around 5-10
>> > metres) from the OS data (vectormap and streetview)? I've
>> > seen various
>> > cases of existing roads being edited to be consistent with
>> > OS data,
>> > but I'm not convinced this is a good idea since the problem
>> > seems to
>> > be consistent in one direction.
>>
>> Glad I'm not the only one. Here in the SW I see the same offsets, although
>> I find the VectorDistrict data to be more like the GPS surveyed data. This
>> means that the StreetView tiles do not match up with the VectorDistrict
>> either: I've been importing some rivers and reservoirs from the
>> VectorDistrict data (namely the River Chew and Chew Valley Lake) and I've
>> found that the polygons seem to be shifted compared to the equivalent
>> positions in StreetView by about 10 metres.
>>
>> I guess this is an expected artifact of the reprojection methods?
>>
>> Tim
>>
>>
>>
>>
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>
>
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