Vector boundaries and population figures for 1971 for the Enumeration Districts of Great Britain

Table ID:

ENUMD_1971_GB     (57868)

Contents:

Vector boundaries and population figures for 1971 for the Enumeration Districts of Great Britain

Approx. number of rows:

124,881

Table type:

Raw Data

Documentation Author:

Paula Aucott

Chronology:

The data cover the period 1881 to 1911.

Sources:

1. The polygons and identifiers for 1971 were obtained via the Census Geography service provided by the UK Data Service Census Support (formerly known as the Edina UKBorders service).
2. The 1971 population figures were obtained via Casweb, a service provided by the UK Data Service Census Support. This service gives access to historical aggregated census statistics for Great Britain between 1971 and 2001.

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Notes:

1. In 1971 Census data for England and Wales and Scotland were collected as Enumeration Districts.
2. 1971 Enumeration District areas are only available as Thiessen polygons. They were generated from centroids of points for the districts. As such they are significantly less accuarate than Enumeration District boundaries in other years.
3. The statistical data were linked to the polygon data via the "join data" function using the "join attributes from a table" option on the unit "zone_code" in ArcGIS. The resulting temporarily joint table was then exported to a new permenant polygon coverage including these datasets.
4. The polygon data file was a compilation of three separate files, Enuermation Districts for England, for Wales and for Scotland using the Geo-processing > merge function in ArcGIS.
5. This permanent coverage was subsequently re-projected from the British national grid via WGS84 to the preferred projection of the EU, ETRS89 LAEA (Lambert Azimuthal Equal Area) in ArcGIS using the Data Management Tools > Projections and Trasnformations > Feature > Project function. When loaded into postgres it was loaded as etrs89 LCC (Lambert Conformal Conic) Projection to coincide with the other etrs89 geometric objects in the database.
6. The EU's preference was for counts of 'Usually Resident', but this was not available for some earlier years therefore we have included both 'Persons Present' and 'Usually Resident' wherever possible.
7. The area for each polygon was generated using the 'Calculcate Geometry' function in ArcGIS.

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Checking:

1. The original data supplied by the UK Data Service were not checked other than making sure each polygon matched a row in the statsitical data.

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Indices:

Index	Type	Column(s) indexed
enumd_1971_gb_pkey	Primary key	gid

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Constraints:

The table has the following associated constraints:

Constraint	Type	Details
enumd_1971_gb_pkey	Primary Key	See details above for primary key index
enforce_dims_g_foot_etrs	Check	(public.st_ndims(g_foot_etrs) = 2)
enforce_geotype_g_foot_etrs	Check	((public.geometrytype(g_foot_etrs) = 'MULTIPOLYGON'::text) OR (g_foot_etrs IS NULL))
enforce_srid_g_foot_etrs	Check	(public.st_srid(g_foot_etrs) = 3034)

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Columns within table:

Column	Type	Contents
gid	Integer number.	Unique row identifier
zone_label	Text string (max.len.=24).	Enumeration District ID number defined by ONS or GROS as supplied.
ed_area_sqm	float8	Area of polygon in square metres, calculated by us in ArcGIS from the polygon.
all_pres	Integer number.	Population within the Enumeration District in 1971.
all_visitors	Integer number.	Derived sum of all visitors within the Enumeration District in 1971.
visitors_la	Integer number.	Number of visitors present from another address within the same Local Authority.
visitors_gb	Integer number.	Number of visitors present from another address outside the local authority, but within Great Britain.
visitors_non_gb	Integer number.	Number of visitors present from outside Great Britain.
pop_hhold	Integer number.	Population in private households.
pop_hhold_res	Integer number.	Population in private households - resident at address of enumeration.
pop_non_hhold	Integer number.	Population not in private households.
pop_non_hhold_esb	Integer number.	Population not in private households - resident in the establishment.
g_foot_etrs	geometry	Boundary polgon, as supplied by the UK Data Service.