HI Rob,

 

I would tend to stick to the stuff downloaded from the NMR on the basis that it should be the best depiction, I often don't have time to check it exhasutively, and if it is wrong, you can pass the buck back to EH.

 

 

best wishes

 

Nick Boldrini

 

Historic Environment Record Officer

Durham County Council

Tel: 0191 3708840

Fax: 0191 3708897

 

 

 

 

On a related note - following local government restructuring in Cheshire I have spent a lot of time (and will spend a lot more) collating, checking and combining the designated heritage assets GIS datasets held by ourselves, the seven former local authorities and those published by the NMR into one ‘definitive’ dataset for the two new unitary authorities. PAI and accuracy issues aside, this has raised some interesting issues on what the two new unitary authorities require from this data and the public perception of the data published on our internet mapping service. Two examples follow:

 

To avoid duplication of effort and datasets one unitary authority is looking to populate and auto update the planning and land charges systems from the data held by the HER. One hurdle is in cross referencing the HER UIDs and the planning systems UIDs. The latter are based on the Local Land and Property Gazetteer (LLPG). The only practical way of addressing this is to generate this spatially via the GIS using a polygonized listed buildings dataset, that depicts structures (captured from OS MasterMap) not curtillage, and the spatial depiction of the LLPG.

 

The HERs and NMRs depiction of Registered Parks and Gardens is based on the 1:10,000 notification maps which when viewed at larger scales can be somewhat adrift of the edge of the park. There is a push within both authorities to map to the largest scale possible which does tend to improve the clarity for non technical users, whereas technical users are made aware that the data is only fit for purpose above 1:10,000.

 

I’m assuming that other HERs and authorities have similar issues, or may have thought about them in relation to HPR. I would be interested to know what paths others have taken, for example do you have your own depictions or do you stick rigidly to those published by the NMR?

 

Best wishes

Rob

 

 

 

 

I was assuming Crispin was asking more whats the point of swapping from one arbitrary representation ( a point) to another (a 5 x 5 area) at all, not querying why it was 5 x 5.

 

And if that’s not what he meant, I would like to know the answer! Seems like a waste of resources.

 

 

5m x 5m is actually quite large, think barn , chest tomb, milestone, finger post.

 

 

Hi Bruce

Are we allowed to ask “why…” ? (to the tiny polygons bit).

Yours

Crispin

 

 

"Statement on Spatial Depictions of Heritage Assets

 

 

English Heritage is in the process of undertaking a programme of work designed to reform the way in which the currently separate designation systems of Listing, Scheduling, Protected Wrecks and the two Registers of Parks and Gardens and Battlefields are created, managed and stored.

 

A new database is being created called the Unified Designation System (UDS), which will not only support the new unified business process but it will also contain all the individual designation records and make these available via the online Heritage List for England. Each record will contain both a textual description together with a mapped indication of the location of the asset.  The UDS and the Heritage List for England will also contain World Heritage Site records. The UDS is planned to go live in early 2011.

 

Currently the various types of designation are spatially depicted by a mixture of points, polygons and multi-part polygons. Each is stored as a separate dataset in the current Geographical Information System (GIS). To ease software development and future maintenance the decision has been taken to move all these depictions to a single dataset in the new system.

 

To enable this to happen it has been agreed to convert all Listed Building entries currently depicted as points into tiny polygons of size 5m x 5m. There are, however, a number of Listed Buildings which are already depicted as larger-scale polygons, some with multiple parts. It is not possible to migrate these across to the new system as they do not have any statutory validity and they might also be mistakenly taken to indicate curtilage. It has therefore been decided that these depictions will also be converted into tiny polygons.

 

The polygons with multiple parts will be gradually converted over the coming months, with the remaining larger-scale polygons and the points converted all together when the new system goes live.

 

For Scheduled Monuments, Protected Wrecks, Registered Battlefields and Registered Parks and Gardens the polygons will remain as the spatial definition of the designated area.

 

The different asset types will continue to be available to all users as separate datasets via the NMR Data Download Area."

 

 

 

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