Intermediate Zone Centroids 2001

Intermediate zone centroids are point features that represent the population weighted centre of intermediate zones - the geography used for the dissemination of results from Scottish Neighbourhood Statistics (SNS) that unsuitable for release at data zone level. Centroids were calculated from a population weighted sum of data zone centroids that fall within an intermediate zone. Eastings and northings for each data zone were multiplied by their population, summed based upon the intermediate zone in which they fell, and then divided by the total population of the intermediate zone. These centroids are in turn used to link intermediate zones to other (higher) geographies via a spatial join, producing a 'best-fit' match between intermediate zones and other SNS geographies. There are 1,235 intermediate zones across Scotland, and each have been assigned an individual code that follows the Scottish Government's standard naming and coding convention. The code prefix is S02, which has been assigned to designate intermediate zones. In most cases, intermediate zones were also been assigned a name by the relevant Community Planning Partnership. From time to time Local Authorities may choose to update these names, and this dataset will be updated to reflect these changes.
 
Citation proposal
(2005) . Intermediate Zone Centroids 2001. Scottish Government https://services.mspdata.eu:/geonetwork/srv/api/records/0b5ec34c-f73d-44ad-b121-d9c63daae81b

Simple

Alternate title
Intermediate Geography Centroids 2001
Date ( Publication )
2005-02-01
Identifier
www.gov.scot / SG_IntermediateZone_Cent_2001

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Maintenance and update frequency
notPlanned Not planned
GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Statistical units
IPVS - Integrated Public Sector Vocabulary version 2
  • Life in the community
Access constraints
otherRestrictions Other restrictions
Other constraints
No limitations on public access
Use limitation
The following attribution statement must be used to acknowledge the source of the information: Copyright Scottish Government, contains Ordnance Survey data © Crown copyright and database right (insert year)
Use limitation
Dataset is complete for Scotland. Care should be taken when using this dataset with lookups to other postcode based geographies. Some postcode unit boundaries have changed since intermediate zones were created therefore exact match of the boundaries are unlikely.
Denominator
10000
Metadata language
eng English
Topic category
  • Location
  • Society
N
S
E
W


Geographic identifier
GB-SCT

 

Date ( Revision )
2007-12-13

Supplemental Information
Reference system identifier
EPSG / OSGB 1936 / British National Grid (EPSG:27700) / 7.4
Distribution format
  • WMS (1.3.0 )

  • WFS (2.0.0 )

  • ESRI REST (1.0 )

  • ESRI Shapefile (1.0 )

OnLine resource
Intermediate Zone Centroids 2001  

OGC View Service

OnLine resource
Intermediate_Zone_Centroids_2001  

OGC Feature Download Service

OnLine resource
Intermediate Zone Centroids 2001  

ESRI REST Service

OnLine resource
Statistical Units  

ATOM Download Service

OnLine resource
Intermediate Zone Centroids 2001  

ESRI Shapefile Download

Hierarchy level
dataset Dataset
Statement

Centroids for intermediate zones were originally created by the Scottish Executive's Geographic Information Service (SEGIS, now the Scottish Government's Geographic Information Science and Analysis Team, GI-SAT) in order to provide a way to link intermediate zones to other (higher) geographic boundaries used by Scottish Neighbourhood Statistics and the wider Scottish Government community. Intermediate zone centroids do not represent the geometric centre of the feature, but rather the population weighted centre. These points were generated using the easting, northing and populations of each data zone included within the intermediate zone. The method used to calculate the centroids is the same as that applied to data zones and is outlined below:

1) The easting of each data zone in the intermediate zone was multiplied by it's population, and then the northing of each of data zone by it's population.

2) The results for all easting and northing for each data zone were then added together (based upon the intermediate zone that they are in) to get a total easting and total northing for each intermediate zone.

3) The average easting and northing was calculated by dividing the totals for easting and northing by the total population (of the intermediate zone).

4) Lastly, the distance from each of the data zone centroids to the average easting/northing was calculated. This was solved using the Pythagoras' Theorem, wherein the distance equals the square root of the difference in easting coordinates squared plus the difference in northing coordinates squared. Each data zone easting was subtracted from the average easting, and in the case of negative results, multiplied by -1 to obtain a positive number. The same procedure was used to calculate the difference in northing coordinates. The data zone coordinate pair with the shortest distance to the average was chosen to represent the centroid of the intermediate zone, deemed to be the closest to the population centre. The dataset is managed by the Scottish Government's Geographic Information Science and Analysis Team (GI-SAT), who carry out any required updates at the request of the Office of the Chief Statistician (OCS).

Metadata

File identifier
0b5ec34c-f73d-44ad-b121-d9c63daae81b   XML
Metadata language
eng English
Hierarchy level
dataset Dataset
Date stamp
2019-06-05
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0

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