Dr Fiona Hemsley-Flint, the STEEV GI Analyst, has imported the sample energy efficiency data provided by the Welsh School of Architecture, Cardiff University into a Postgres database where the full dataset will eventually be stored.
A mapserver/openlayers based mapping example has been set up and implements the WMS-Time querying capabilities (this is the capability of a web map server to accept temporal data requests – see http://mapserver.org/ogc/wms_time.html for further specification). Although this is only a basic example, it shows that it is possible to use the WMS-T successfully.
As an aside, it was also interesting to note the difference in performance between PostGIS and Shapefiles when querying the data through WMS-T – PostGIS had a much faster response time.
The test variable in this case is SAP rating. An energy performance measure (where 1 is very poor and 120 is excellent) similar to the Energy Performance Certificate used to assess domestic properties in England and Wales –
http://www.bre.co.uk/sap2009/
[Caption: 1:10,000 scale map of an area of South Wales – domestic SAP ratings for 1990 at individual dwelling level]
[Caption: 1:3,500 scale map of an area of South Wales – domestic SAP ratings for 2000 at individual dwelling level]
Further sample data are to be provided in the coming week or so.
I don’t know SAP rating other than a glance at posters in building foyers, but is it a valid thought to have the additional layers: SAP rating difference 1990-2000, and 2000-2010 (and possibly 1990-2010)? So you can see which/where buildings have improved their SAP rating.
Hi Gregory – this is part and parcel of what STEEV will aim to achieve i.e. enable a practioner or novice end-user to visualise the change in energy efficiency meaures (incl. SAP) over time at a fine level of sptial granularity. it shoud in theory be easy to eye-ball an individual building and ascertain whether it’s energy ratings have improved or worsened over time.