Accessing OS NGD FAQ's

🆕Field Boundary

A Field Boundary is a line feature representing the field boundary features adjacent to, or contained within, areas of agricultural land, trees, rough grassland or heath. It also includes features adjacent to land in the RPA’s Rural Land Register that are situated within urban areas in England. Field Boundary features replicate all, or part of, the underlying OS NGD Structure (Built Obstruction) Line and are classified as Tree Canopy, Wooded Strip, Hedge, Wall, Other or Unknown (in hierarchy order).

Temporal Filtering

The earliest date on which you can request a one-off snapshot of a date in the past, for data in this feature type 27 March 2024.

Feature type attributes

The following sub-sections provide details about the attributes included with this feature type, their data types in the different output formats, and other important metadata about them.

osid

Primary identifier for the feature. The OSID is a Globally Unique Identifier (GUID) and requires no centralised authority to ensure uniqueness. Note that the same OSID can occur in more than one feature type when a single feature is represented multiple times in the OS NGD.

  • Data Types: String (GeoJSON), String (GPKG), String (CSV)

  • Nullable: false

  • Max Length: 36

  • OS NGD API – Features Filterable: Yes

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

structureline_osid

Primary identifier of the Structure Line in OS NGD Structures theme the field boundary feature has been derived from.

  • Data Types: String (GeoJSON), String (GPKG), String (CSV)

  • Nullable: false

  • Max Length: 36

  • OS NGD API – Features Filterable: Yes

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

versiondate

The date on which this version of the feature entered the OS National Geographic Database.

  • Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

  • Nullable: false

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

versionavailablefromdate

The date this version of the feature became the latest version.

  • Data Types: String (GeoJSON), DateTime (GPKG), DateTime (CSV)

  • Nullable: false

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

versionavailabletodate

The date on which this version of the feature was superseded by an update or ceased to exist.

  • Data Types: String (GeoJSON), DateTime (GPKG), DateTime (CSV)

  • Nullable: true

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

changetype

The type of change that generated a new version of the feature.

  • Data Types: String (GeoJSON), String (GPKG), String (CSV)

  • Nullable: false

  • Code List Name: changetypevalue

  • Max Length: 50

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

geometry

The geometry for the feature.

  • Data Types: Geometry (GeoJSON), Geometry (GPKG), WKT (CSV)

  • Nullable: false

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

  • Geometry Type: LineString

geometry_length_m

The measured length of the feature in metres, up to 15 decimal places.

  • Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)

  • Nullable: false

  • Precision: 15

  • Scale: 3

  • OS NGD API – Features Filterable: Yes

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

geometry_evidencedate

The date on which the latest evidence was gathered to make an update if required. For example, the date of collection by a surveyor or third party information received.

  • Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

  • Nullable: false

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

geometry_updatedate

The date on which the attribute was last updated.

  • Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

  • Nullable: false

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

theme

The OS NGD Theme to which the feature belongs.

  • Data Types: String (GeoJSON), String (GPKG), String (CSV)

  • Nullable: false

  • Code List Name: themevalue

  • Max Length: 40

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

description

A single descriptive value intended for a quick understanding of what the feature represents.

  • Data Types: String (GeoJSON), String (GPKG), String (CSV)

  • Nullable: false

  • Code List Name: fieldboundarydescriptionvalue

  • Max Length: 20

  • OS NGD API – Features Filterable: Yes

  • OS Select+Build Filterable: Yes

  • Data Schema Version: 1.0

imagery_evidencedate

The date on which the latest imagery capture was gathered and used to identify the field boundary feature.

  • Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

  • Nullable: true

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

minimumheight_m

A calculated value, in metres, to represent the minimum height for each section of field boundary classified as Tree Canopy, Wooded Strip or Hedge. Walls are not given a height value. Values are rounded up to the next half metre.

  • Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)

  • Nullable: true

  • Precision: 5

  • Scale: 1

  • OS NGD API – Features Filterable: Yes

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

maximumheight_m

A calculated value, in metres, to represent the maximum height for each section of field boundary classified as Tree Canopy, Wooded Strip or Hedge. Walls are not given a height value. Values are rounded up to the next half metre.

  • Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)

  • Nullable: true

  • Precision: 5

  • Scale: 1

  • OS NGD API – Features Filterable: Yes

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

averageheight_m

A calculated mean value, in metres, to represent the most appropriate average height for each section of field boundary classified as Tree Canopy, Wooded Strip or Hedge. Walls are not given a height value. Values are rounded up to the next half metre.

  • Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)

  • Nullable: true

  • Precision: 5

  • Scale: 1

  • OS NGD API – Features Filterable: Yes

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

minimumwidth_m

A calculated value, in metres, to represent the minimum width for each section of field boundary classified as Tree Canopy, Wooded Strip or Hedge. Walls are not given a width value. Values are rounded up to the next half metre.

  • Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)

  • Nullable: true

  • Precision: 5

  • Scale: 1

  • OS NGD API – Features Filterable: Yes

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

maximumwidth_m

A calculated value, in metres, to represent the maximum width for each section of field boundary classified as Tree Canopy, Wooded Strip or Hedge. Walls are not given a width value. Values are rounded up to the next half metre.

  • Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)

  • Nullable: true

  • Precision: 5

  • Scale: 1

  • OS NGD API – Features Filterable: Yes

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

averagewidth_m

A calculated mean value, in metres, to represent the most appropriate average width for each section of field boundary classified as Tree Canopy, Wooded Strip or Hedge. Walls are not given a width value. Values are rounded up to the next half metre.

  • Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)

  • Nullable: true

  • Precision: 5

  • Scale: 1

  • OS NGD API – Features Filterable: Yes

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

iswoodlandboundary

A Boolean flag to identify whether a field boundary is adjacent to a land cover area classified as woodland.

‘Woodland’ is defined as a land cover polygon with a classification of Coniferous Trees and/or Non-Coniferous Trees. Where vegetated field boundary features are adjacent to an area of woodland, they are not given a height and width value.

  • Data Types: Boolean (GeoJSON), Integer (GPKG), String (CSV)

  • Nullable: true

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

iswoodlandboundary_evidencedate

The date on which the latest evidence was gathered to make an update if required. For example, the date of collection by a surveyor or third party information received.

  • Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

  • Nullable: true

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

iswoodlandboundary_updatedate

The date on which the attribute was last updated.

  • Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

  • Nullable: true

  • OS NGD API – Features Filterable: No

  • OS Select+Build Filterable: No

  • Data Schema Version: 1.0

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