Sites of Special Scientific Interest Units (England)

Sites of Special Scientific Interest Units (England)
Alternative Title

SSSI Units
Dataset Language

Site Units are divisions of SSSIs. based on habitat, tenure and management, and are the basis for recording all information on SSSI Condition and management.
They range in Area from 0.004ha up to 18,000ha and only overlap where SSSIs overlap. Boundaries are generally mapped against Ordnance Survey MasterMap. Attribution statement:
© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right [year].
Topic Category

Keyword Value: Environment, LandUse, OpenData
Originating Controlled Vocabulary: GEMET - INSPIRE Spatial Data Themes (GEMET)
Originating Controlled Vocabulary Citation: 2008-01-01
Temporal Extent

from -1970-01-01 to -2099-12-31
Dataset Reference Date

Date:2016-05-01 -2021-04-15
Date Type:publication, revision

All data is captured to the Ordnance Survey National Grid sometimes called the British National Grid. OS MasterMap Topographic Layer produced and supplied by Ordnance Survey from data at
1:1250, 1:2500 and 1:10000 surveying and mapping standards - is used as the primary source. Other sources acquired internally and from external suppliers - may include aerial imagery at resolutions ranging from 25cm to 2m, Ordnance Survey 1:10000 raster images, historical OS mapping,
charts and chart data from UK Hydrographic Office and other sources, scanned images of paper designation mapping (mostly originally produced at 1:10560 or 1:10000 scales), GPS and other surveyed data, and absolute coordinates.
The data was first captured against an August 2002 cut of OS MasterMap Topography. Natural England has successfully uploaded an up-to-date version of OS MasterMap Topographic Layer.
However, we have not yet updated our designated data holding to this new version of MasterMap. This should occur in the near future, when we will simultaneously apply positional accuracy improvement (PAI) to our data.

Vertical Extent

Spatial Reference System

OSGB36 - National Grid of Great Britain
Spatial Resolution

Resource Locator
protocol: WWW:LINK-1.0-http--link
name: ArcGIS Open Dataset record page
description: ArcGIS Open Dataset record page
protocol: DSP:ESRI
name: SitesOfSpecialScientificInterestUnitsEngland_Download
description: Sites of Special Scientific Interest Units (England) Download
protocol: WFS
name: SitesOfSpecialScientificInterestUnitsEngland_WFS
description: Sites of Special Scientific Interest Units (England) WFS
protocol: WMS
name: SitesOfSpecialScientificInterestUnitsEngland_WMS
description: Sites of Special Scientific Interest Units (England) WMS <\dd>
Layerfile for use by HCC internal staff:\\geodata\NatEng\SSSI
Responsible Organisation

Natural England
Role: Resource Provider, Custodian, Owner, Originator, Point of Contact, Processor, Publisher, Author.
Limitations on Public Access

There are no public access constraints to this data. Use of this data is subject to the licence identified.
Use Constraints

Open Government Licence
This data is supplied without guarantee or any warranty as to the accuracy, currency or completeness, and is provided as is, excluding any warranties of any
kind, either express or implied, to the fullest extent permitted by law,including (but not limited to) satisfactory quality or fitness for a particular purpose.
Additional information

Resource Identifier


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.
Re-designing HCC Data for INSPIRE not done
Equivalent scale

Bounding box
-6.41736, 2.05827, 55.7447, 49.8625
Quality scope
Spatial representation type

Character encoding
Data quality
Maintenance information
maintenance and update frequency:asNeeded
update scope:
maintenance note:
Metadata update date
Metadata Language

Metadata Point of Contact

Natural England
Role: Resource Provider, Custodian, Owner, Originator, Point of Contact, Processor, Publisher, Author.
Resource Type

6 Dataset
File Identifier
Hierarchy level name
Parent identifier
Metadata standard name

Metadata standard version
Review date
Name Long Name Description

OSGB36 National Grid Bounding Coordinates

West: 486000 East: 552000 North: 245000 South: 189000
More Information

Change History