Identification info

Alternative title

Intermediate Geography Centroids 2001

Metadata Language

English

Character set

UTF8

Dataset Reference Date (Publication)

2005-02-01

Identifier

www.gov.scot / SG_IntermediateZone_Cent_2001

Maintenance and update frequency

Not planned

GEMET - INSPIRE themes, version 1.0

• Statistical units

GEMET - Concepts, version 2.4

• population distribution

• statistical data

IPSV Subjects List

• Statistical analysis

Limitations on Public Access

Other restrictions

Other constraints

No limitations to public access

Use constraints

Other restrictions

Other constraints

Open Government Licence

Other constraints

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)

Other constraints

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.

Spatial representation type

Vector

Denominator

10000

Topic category

• Location
• Society

Code

S92000003

 

Code

EPSG:4258

Code

EPSG:27700

Distribution Information

 

Data quality info

Quality Scope

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

English

Resource type

Dataset

Metadata Date

2021-01-18T16:20:10

Metadata standard name

UK GEMINI

Metadata standard version

2.3