[Talk-GB] Land Registry as a source of alignment

[Tony Shield]

Hi

I've been using the cadastral data since it was made easily available in 
the past few months.

Its not too difficult to align to Bing imagery but the offset changes 
often. Sometimes I find that the offset can change every few hundred 
metres - not too bad if you are aware.

While it definitely helps my mapping efforts it does have limitations of 
completeness, say 20% of properties are not available because they have 
not changed ownership recently - they appear to be digitising on change 
of ownership and trawling the historical record, council housing seems 
to be unbounded.  I have seen some parcels of land which make no sense 
to me.

I do recommend it and as it is located accurately I can see buildings 
which are not accurately located but obviously were accurate from the 
aerial at the time.

Tony

On 06/04/2021 11:49, Ken Kilfedder wrote:
> Further to Ed's offer, is it now possible to use the Cadastrals to 
> definitely align the various aerial imagery - in particular the Bing 
> imagery.
>
> It seems like that would be a very useful endeavour.   (Assuming a 
> common offset would apply, it might be quite straightforward too)
>
> ---
> https://hdyc.neis-one.org/?spiregrain 
> <https://hdyc.neis-one.org/?spiregrain>
> spiregrain_osm at ksglp.org.uk <mailto:spiregrain_osm at ksglp.org.uk>
>
>
> On Tue, 6 Apr 2021, at 8:04 AM, Edward Bainton wrote:
>> > (We should probably put a bit more detail about this on the wiki 
>> somewhere.)
>>
>> I'll happily take that on if someone can suggest an appropriate place.
>>
>>
>> On Mon, 5 Apr 2021 at 20:21, Russ Garrett <russ at garrett.co.uk 
>> <mailto:russ at garrett.co.uk>> wrote:
>>
>>     This was covered a bit in these threads from last month:
>>
>>     https://lists.openstreetmap.org/pipermail/talk-gb/2021-March/026334.html
>>     <https://lists.openstreetmap.org/pipermail/talk-gb/2021-March/026334.html>
>>     https://lists.openstreetmap.org/pipermail/talk-gb/2021-March/026352.html
>>     <https://lists.openstreetmap.org/pipermail/talk-gb/2021-March/026352.html>
>>
>>     The basic gist of it is that these boundaries are not necessarily
>>     legally binding, but they should not have any appreciable offset. The
>>     boundaries will likely have been drawn against OS MasterMap,
>>     which for
>>     our purposes is likely pretty close to perfect.
>>
>>     In practice, it's probably the best source of alignment where a land
>>     registry boundary matches a wall, building, hedgerow, or similar.
>>
>>     (We should probably put a bit more detail about this on the wiki
>>     somewhere.)
>>
>>     Cheers,
>>
>>     Russ
>>
>>     On Mon, 5 Apr 2021 at 20:11, Andrew Hain
>>     <andrewhainosm at hotmail.co.uk
>>     <mailto:andrewhainosm at hotmail.co.uk>> wrote:
>>     >
>>     > How reliable are the Land Registry parcels as a source to align
>>     buildings and other mappping?
>>     >
>>     > --
>>     > Andrew
>>     > _______________________________________________
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>>
>>
>>
>>     -- 
>>     Russ Garrett
>>     russ at garrett.co.uk <mailto:russ at garrett.co.uk>
>>
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