newGeoSure Insurance Product version 7 2015.1
**This dataset has been superseded** The newGeoSure Insurance Product (newGIP) provides the potential insurance risk due to natural ground movement. It incorporates the combined effects of the 6 GeoSure hazards on (low-rise) buildings. This data is available as vector data, 25m gridded data or alternatively linked to a postcode database – the Derived Postcode Database. A series of GIS (Geographical Information System) maps show the most significant hazard areas. The ground movement, or subsidence, hazards included are landslides, shrink-swell clays, soluble rocks, running sands, compressible ground and collapsible deposits. The newGeoSure Insurance Product uses the individual GeoSure data layers and evaluates them using a series of processes including statistical analyses and expert elicitation techniques to create a derived product that can be used for insurance purposes such as identifying and estimating risk and susceptibility. The Derived Postcode Database (DPD) contains generalised information at a postcode level. The DPD is designed to provide a ‘summary’ value representing the combined effects of the GeoSure dataset across a postcode sector area. It is available as a GIS point dataset or a text (.txt) file format. The DPD contains a normalised hazard rating for each of the 6 GeoSure themes hazards (i.e. each GeoSure theme has been balanced against each other) and a combined unified hazard rating for each postcode in Great Britain. The combined hazard rating for each postcode is available as a standalone product. The Derived Postcode Database is available in a point data format or text file format. It is available in a range of GIS formats including ArcGIS (*.shp), ArcInfo Coverages and MapInfo (*.tab). More specialised formats may be available but may incur additional processing costs. The newGeoSure Insurance Product dataset has been created as vector data but is also available as a raster grid. This data is available in a range of GIS formats, including ArcGIS (*.shp), ArcInfo coverage’s and MapInfo (*.tab). More specialised formats may be available but may incur additional processing costs. Data for the newGIP is provided for national coverage across Great Britain. The newGeoSure Insurance Product dataset is produced for use at 1:50 000 scale providing 50 m ground resolution. This dataset has been specifically developed for the insurance of low-rise buildings. The GeoSure datasets have been developed to identify the potential hazard for low-rise buildings and those with shallow foundations of less than 2 m deep. The identification of ground instability and other geological hazards can assist regional planners; rapidly identifying areas with potential problems and aid local government offices in making development plans by helping to define land suited to different uses. Other users of these data may include developers, homeowners, solicitors, loss adjusters, the insurance industry, architects and surveyors. Version 7 released June 2015.
dataset
:
http://data.bgs.ac.uk/id/dataHolding/13606634
English
Geoscientific information
GEMET - INSPIRE themes, version 1.0:
BGS Thesaurus of Geosciences:
UK Location (INSPIRE)
Natural hazards
Free:
Free:
NERC_DDC
-8.1700,
49.8800,
2.6900,
60.8100
ENG, ENGLAND [id=150000], SCOTLAND [id=140000], SCT, WALES [id=170000], WLS
creation: 2015-05-22
unknown
-
before
vector
British Geological Survey
Enquiries
Environmental Science Centre, Nicker Hill, Keyworth,
NOTTINGHAM,
NG12 5GG,
United Kingdom
tel: 0115 936 3143
email:
enquiries@bgs.ac.uk
Role: distributor
British Geological Survey
Enquiries
Environmental Science Centre, Nicker Hill, Keyworth,
NOTTINGHAM,
NG12 5GG,
United Kingdom
tel: 0115 936 3143
email:
enquiries@bgs.ac.uk
Role: point of contact
Data Quality
In detail, the methodology behind producing the DPD is as follows: 1. The postcode centroids layer, as supplied by Ordnance Survey, is buffered using a value of 300 metres. This value takes into account the variability in size of postcodes (250 metres) and the 50 metres cartographic precision of the Digital Geological Map of Great Britain at the 1:50,000 scale (DiGMapGB-50) data that is used as the geological basis for the GeoSure hazard layers. 2. An 'occurrence rating' is then assigned to each of the A-E levels of each master GeoSure hazard layer. These occurrence ratings represent how frequently a ground movement event may occur that could have the potential to damage a property (in particular, low-rise buildings). The occurrence ratings are then multiplied by a nominal score (100) in order to derive a series of 'unified ratings'. Before use in the DPD, these unified rating values in the table are then multiplied by 10 allow the use of integer values. For example a class 'D' shrink-swell pixel will have a value of 10 x 10 = 100. 3. Zonal statistics are then calculated using the buffered postcode layer from above in conjunction with each of the six GeoSure hazard grids (25m pixel size). This process considers each hazard in turn and calculates the average of the pixel values that occur within each of the buffered postcodes (circular areas). As each pixel covers the same area the resultant average represents the area-weighted average of the hazard values within the circular area. These average values for each hazard are added to the output Derived Postcode Database as 'occurrence factors'. 4. The six hazard occurrence factors for each postcode are summed and added to the DPD as column Total_of (Postcode Total Occurrence Factor, PTOF). 5. The Total_of column is classified into 5 classes divided into 5 equal categories as shown in table 3 of the newGeoSure Insurance Product: Methodology report. (IR/12/074). This classification is added as column Class5 with values of 1-10. This, and the Class5 split, is done in order to allow easier interpretation and visualisation of the total hazard if required (for example, Class5 can be used to colour up the postcode centroid in the GIS to show how the total hazard varies across an area).
Equivalent Scale:
1:
50000
INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Constraints
The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.
The dataset is made available to external clients under BGS Digital Data Licence terms and conditions. Revert to the IPR Section (iprdigital@bgs.ac.uk) if further advice is required with regard to permitted usage.
Metadata about metadata
16f8a3dc-9ea3-333e-e054-002128a47908
British Geological Survey
tel: +44 115 936 3100
email:
enquiries@bgs.ac.uk
Role: point of contact
2024-04-24