Guidance

Fissures and Breaklines Metadata

Published 9 October 2014

1. Description

1.1 Keywords

Theme: Coal, Mining, Data, Mining Report, Ground Stability, Fissures, Breaklines

1.2 Abstract

Fissures and breaklines are types of geological disturbances which are lines of weaknesses at the surface which may have been affected by coal mining.

1.3 Purpose

Mining and geographical data held on the Coal Authority Mining Database.

1.4 Supplementary Information

Fissures are a crack or opening in rock or the earth, created by mining in certain circumstances and breaklines are a vertical step in the rock or earth, created when underground mining has caused differential settlement at the surface. Breaklines are usually associated with geological features such as fault lines.

The position of these geological disturbances are captured into the GIS database following claims made under the Coal Mining Subsidence Act 1991 against the Coal Authority (prior to 1994) or the mine operators (post 1994).

The polygon represents a 5m buffer around the line of the fissure or breakline indicating the area that may have been affected.

The National Coal Mining Database, which is based on the records held at The Coal Authority offices in Mansfield, Nottinghamshire, is updated on a regular basis. This dataset has been extracted from this dynamic database on the date stated below and therefore represents a snapshot in time.

1.5 Status of the data

Extract of data from the National Coal Mining Database Data update frequency: As needed

1.6 Time period for which the data is relevant

Date and time: 14/08/2014 Description: Dataset export from the National Coal Mining Database

1.7 Publication Information

Who created the data: The Coal Authority Date and time: 26/09/2014

1.8 Data storage and access information

File name: FissuresBreaklines Type of data: vector digital data Data processing environment: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 10.0 (Build 2800)

1.9 Accessing the data

Size of the data: Data transfer size:

1.10 Constraints on accessing and using the data

Access and use constraints: This data, service or application is provided free of charge under the terms and conditions of the Open Government Licence.

The full terms and conditions of the Open Government Licence can be viewed at: http://www.nationalarchives.gov.uk/doc/open-government-licence/

If you need any additional advice please contact the Customer Service Team on +44 (0) 345 762 6848 or at groundstability@coal.gov.uk

1.11 Details about this document

Contents last updated: 26/09/2014

1.12 Who completed this document

Louise Tipper, Information Management, The Coal Authority mailing and physical address: 200 Lichfield Lane Mansfield Nottinghamshire NG18 4RG England +44(0) 345 762 6848

1.13 Standards used to create this document

Standard name: FGDC Content Standards for Digital Geospatial Metadata Standard version: FGDC-STD-001-1998 Time convention used in this document: local time Metadata profiles defining additional information  ESRI Metadata Profile: http://www.esri.com/metadata/esriprof80.html

2. Spatial

2.1 Horizontal coordinate system

Projected coordinate system name: British_National_Grid Geographic coordinate system name: GCS_OSGB_1936

2.2 Map Projection Name

Transverse Mercator Scale Factor at Central Meridian: 0.999601 Longitude of Central Meridian: -2.000000 Latitude of Projection Origin: 49.000000 False Easting: 400000.000000 False Northing: -100000.000000

2.3 Planar Coordinate Information

Planar Distance Units: meters Coordinate Encoding Method: coordinate pair

2.4 Coordinate Representation

Abscissa Resolution: 0.000000 Ordinate Resolution: 0.000000

2.5 Geodetic Model

Horizontal Datum Name: D_OSGB_1936 Ellipsoid Name: Airy_1830 Semi-major Axis: 6377563.396000 Denominator of Flattening Ratio: 299.324965

2.6 Altitude System Definition

Resolution: 0.000100 Encoding Method: Explicit elevation coordinate included with horizontal coordinates

2.7 Bounding coordinates

2.8 Horizontal

In decimal degrees West: -5.973728 East: 1.952598 North: 58.029351 South: 50.977168

2.9 In projected or local coordinates

Left: 165007.000000 Right: 633740.000000 Top: 904433.880000 Bottom: 125147.990000

Spatial data description Vector data information ESRI description

2.10 Fissures and Breaklines

ESRI feature type: Simple Geometry type: Polygon Topology: FALSE Feature count: 4503 Spatial Index: TRUE Linear referencing: FALSE

2.11 SDTS description

Feature class: SDTS feature type, feature count  Fissures: G-polygon, 4503

3. Attributes

3.1 Details for Fissures and Breaklines

Type of object: Feature Class Number of records: 4503

3.2 FID

Alias: FID Data type: OID Width: 4 Precision: 0 Scale: 0 Definition: Internal feature number. Definition Source: ESRI

3.3 Shape

Alias: Shape Data type: Geometry Width: 0 Precision: 0 Scale: 0 Definition: Feature geometry. Definition Source: ESRI

3.4 OBJECTID

Alias: OBJECTID Data type: Number Width: 9

3.5 FEATURE_TYPE

Alias: FEATURE_TYPE Data type: String Definition: The coal mining feature type Width: 50

3.6 HYPERLINK

Alias: HYPERLINK Data type: String Definition: Web URL for further information Width: 50

3.7 TYPE

Alias: TYPE Data type: String Definition: The type of geological disturbance: Fissure or Breakline Width: 50

3.8 Shape_Length

Alias: Shape_Length Data type: Float Width: 19 Number of decimals: 11

3.9 SHAPE_Area

Alias: Shape_Area Data type: Float Width: 19 Number of decimals: 11 Definition: Area of feature in internal units squared. Definition Source: ESRI