[Buildingdata] Re: outliers

[Christopher Gutteridge]

I was thinking of doing something like that for this map: 
http://maps.southampton.ac.uk/service/?src=http://id.southampton.ac.uk/dataset/places/latest

which is rather screwed up on centering since we opened a building in 
Malaysia...

On 16/04/2013 10:59, Andy Turner wrote:
> This may be equivalent to your horrible hack, but one can truncate (as 
> in a truncated mean statistics) as follows: Calculate the centroid of 
> all the points, calculate the distance to all points from this 
> centroid, discount say the 5% of the furthest away points, recalculate 
> the bounding box (or circle or whatever you are using) for the 
> remaining points and use this. This could be computationally slow if 
> you are doing it lots of times, and setting the threshold is 
> arbitrary, but this could work. There are various ways to speed this 
> up, for instance you could simply use the centroid of each of the 
> buildings rather than each of their complete geometries. HTH Andy
>
>
> On Tue, Apr 16, 2013 at 10:29 AM, Christopher Gutteridge 
> <cjg at ecs.soton.ac.uk <mailto:cjg at ecs.soton.ac.uk>> wrote:
>
>     So I've got a situation. On our main campus, the database lists two
>     buildings as part of that site, although they are quite a way off the
>     main site and really screw up any automatic map renderings as they
>     cause
>     the important part to shrink when scaled-to-fit.
>
>     The ideal solution is to have better data, but I am not allowed to
>     edit
>     what estates send me, although I can augment it.
>
>     I currently remove them with an awful hack in the code, but what I'm
>     thinking is creating a relationship between a thing and seomthing it's
>     listed as having within, but should not be included on the default
>     map. eg.
>
>     <http://id.southampton.ac.uk/site/1> hasOutlier
>     <http://id.southampton.ac.uk/building/1580> .
>
>     Any thoughts?
>
>     --
>     Christopher Gutteridge -- http://users.ecs.soton.ac.uk/cjg
>
>     University of Southampton Open Data Service:
>     http://data.southampton.ac.uk/
>     You should read the ECS Web Team blog:
>     http://blogs.ecs.soton.ac.uk/webteam/
>
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>
>
>
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-- 
Christopher Gutteridge -- http://users.ecs.soton.ac.uk/cjg

University of Southampton Open Data Service: http://data.southampton.ac.uk/
You should read the ECS Web Team blog: http://blogs.ecs.soton.ac.uk/webteam/

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