Dosya Dosya geçmişi Dosya kullanımı Küresel dosya kullanımıDaha yüksek çözünürlüğe sahip sürüm bulunmamaktadır Tyne and

Dosya Dosya geçmişi Dosya kullanımı Küresel dosya kullanımıDaha yüksek çözünürlüğe sahip sürüm bulunmamaktadır East Suss

A PDF map that shows the counties and unitary authorities in the United Kingdom as at 1 April 2023. (File Size - 583 KB)

Recorded Flood Outlines is a GIS layer which shows all our records of historic flooding from rivers, the sea, groundwater and surface water. Each individual Recorded Flood Outline contains a consistent list of information about the recorded flood.

Records began in 1946 when predecessor bodies to the Environment Agency started collecting detailed information about flooding incidents, although we may hold limited details about flooding incidents prior to this date.

The absence of coverage by Recorded Flood Outlines for an area does not mean that the area has never flooded, only that we do not currently have records of flooding in this area.

It is also possible that the pattern of flooding in this area has changed and that this area would now flood or not flood under different circumstances.

The Recorded Flood Outlines take into account the presence of defences, structures, and other infrastructure where they existed at the time of flooding. It includes flood extents that may have been affected by overtopping, breaches or blockages.

Any flood extents shown do not necessarily indicate that properties were flooded internally.

A companion dataset Historic Flood Map contains a subset of these Recorded Flood Outlines which satisfy a certain criteria.

Dosya Dosya geçmişi Dosya kullanımı Küresel dosya kullanımıBu önizlemenin boyutu 758 600 piksel Diğer çözünürlükler 303

This dataset is now retired and replaced with the following:

Reservoir Flood Extents - Fluvial Contribution (National) https://environment.data.gov.uk/dataset/db114020-465a-412b-b289-be393d995a75 Reservoir Flood Extents - Wet Day (National) https://environment.data.gov.uk/dataset/d81646cf-37e5-4e71-bbcf-b7d5b9ca3a1c Reservoir Flood Extents - Dry Day (National) https://environment.data.gov.uk/dataset/c66ee97f-49d2-454e-9a19-d48a47bd22ad

This is the simplified version of the outline Reservoir Flood Map Outline (Speed) as shown on the gov.uk Flood Risk website. This is one of 3 available "Risk of Flooding from Reservoirs" Web Mapping Services; Maximum Flood Depth, Maximum Flood Extent, Maximum Flood Speed.

. Simplified in this context refers to the fact that unlike the detailed product, individual reservoir flood map speeds are not shown separately, and one merged outline shows the maximum flood speeds for all reservoir flooding scenarios together.

This is a data layer showing a combined reservoir flood map for 2,092 Large Raised Reservoirs including attributed data. The data shows the maximum speed of flooding should reservoirs be breached, and although the location of each reservoir can be inferred they are not explicitly shown on the maps. The Reservoir Flood Map Maximum Flood Outline (Speed) in its simplified form is referred to externally as Risk of Flooding from Reservoirs – Maximum Flood Speed.

The Reservoir Flood Map Outline (Speed) shows the maximum flood speeds that might be expected if a reservoir were to fail and release the water it holds. Since this is a prediction of a credible worst case scenario, it’s unlikely that any actual flooding would create speeds this high. These data are intended for emergency planning only and are not reliable for large scale flood risk assessments.

Please note that only flood maps for large reservoirs are displayed. Flood maps are not displayed for smaller reservoirs or for reservoirs commissioned after reservoir mapping began in spring 2009.

Information Warning: Only the Maximum extent, velocity and depth categories are available under the standard OGL terms when supplied as a WMS. This excludes the underlying data. Attribution statement: © Environment Agency copyright and/or database right 2019. All rights reserved.

Historic Flood Map is a GIS layer showing the maximum extent of all individual Recorded Flood Outlines from river, the sea and groundwater springs and shows areas of land that have previously been subject to flooding in England. Records began in 1946 when predecessor bodies to the Environment Agency started collecting detailed information about flooding incidents, although we may hold limited details about flooding incidents prior to this date. This dataset differs from the Recorded Flood Outline dataset in that it contains only those flood outlines that are 'considered and accepted' if the following criteria are met:photographic/video evidence with the location referencedrecorded flood levels with the location referencedevidence that the outline represents the time of peak water level (for example date / time stamped photo)evidence that the source of flooding is from rivers, the sea or groundwater and not surface water/overland runoff. The absence of coverage by the Historic Flood Map for an area does not mean that the area has never flooded, only that we do not currently have records of flooding in this area. It is also possible that the pattern of flooding in this area has changed and that this area would now flood under different circumstances. The Historic Flood Map will take into account of the presence of defences, structures, and other infrastructure where they existed at the time of flooding. It will include flood extents that may have been affected by overtopping, breaches or blockages. Flooding shown to the land and does not necessarily indicate that properties were flooded internally. The Historic Flood Map consists of spatial data only.

This dataset is refreshed on a weekly basis from the datasets the team works on daily.Last update date: 27 June 2025.National Highways Operational Highway Boundary (RedLine) maps out the land belonging to the highway for the whole Strategic Road Network (SRN). It comprises two layers; one being the an outline and another showing the registration status / category of land of land that makes up the boundary. Due to the process involved in creating junctions with local highway authority (LHA) roads, land in this dataset may represent LHA highway (owned by National Highways but the responsibility of the LHA to maintain). Surplus land or land held for future projects does not form part of this dataset.The highway boundary is derived from:Ordnance Survey Mastermap Topography,HM Land Registry National Polygon Service (National Highway titles only), andplots researched and digitised during the course of the RedLine Boundary Project.The boundary is split into categories describing the decisions made for particular plots of land. These categories are as follows:Auto-RedLine category is for plots created from an automated process using Ordnance Survey MasterMap Topography as a base. Land is not registered under National Highways' name. For example, but not limited to, unregistered ‘ancient’ highway vested in Highways England, or bridge carrying highways over a rail line.NH Title within RedLine category is for plots created from Land Registry Cadastral parcels whose proprietor is National Highways or a predecessor. Land in this category is within the highway boundary (audited) or meets a certain threshold by the algorithm.NH Title outside RedLine category is for plots created in the same way as above but these areas are thought to be outside the highway boundary. Where the Confidence is Low, land in this category is yet to be audited. Where the Confidence is High, land in this category has been reviewed and audited as outside our operational boundary.National Highways (Technician) Data category is for plots created by National Highways, digitised land parcels relating to highway land that is not registered, not yet registered or un-registerable.Road in Tunnel category, created using tunnel outlines from Ordnance Survey MasterMap Topography data. These represent tunnels on Highways England’s network. Land is not registered under National Highways' name, but land above the tunnel may be in National Highways’ title. Please refer to the definitive land ownership records held at HM Land Registry.The process attribute details how the decision was made for the particular plot of land. These are as follows:Automated category denotes data produced by an automated process. These areas are yet to be audited by the company.Audited category denotes data that has been audited by the company.Technician Data (Awaiting Audit) category denotes data that was created by National Highways but is yet to be audited and confirmed as final.The confidence attribute details how confident you can be in the decision. This attribute is derived from both the decisions made during the building of the underlying automated dataset as well as whether the section has been researched and/or audited by National Highways staff. These are as follows:High category denotes land that has a high probability of being within the RedLine boundary. These areas typically are audited or are features that are close to or on the highway.Moderate category denotes land that is likely to be within the highway boundary but is subject to change once the area has been audited.Low category denotes land that is less likely to be within the highway boundary. These plots typically represent Highways England registered land that the automated process has marked as outside the highway boundary.Please note that this dataset is indicative only. For queries about this dataset please contact the GIS and Research Team.

Mid scale vector polygon dataset of NI Outline. Published here for OpenData. By download or use of this dataset you agree to abide by the LPS Open Government Data Licence.Please Note for Open Data NI Users: Esri Rest API is not Broken, it will not open on its own in a Web Browser but can be copied and used in Desktop and Webmaps

Sketch map with hand written notes indicating rock types for Ndere Island

The geology underlying Thwaites Glacier plays a critical role in mediating ice flow in this region yet is extremely poorly known. Using new compilations of airborne radar, magnetic and gravity data, supported by published geological evidence, we have interpreted the subglacial geology of the Thwaites Glacier region. Here we provide the new data compilations, results of 3D inversions and vector components defining the lithological units on our new geological sketch map.

British Antarctic Survey (BAS) National Capability contribution to the International Thwaites Glacier Collaboration (ITGC) (TJ), NERC Grant NE/S006621/1 (Geophysical Habitats of Subglacial Thwaites (Ghost)) (BK), Antarctic Science Collaboration Initiative program (Australian Government) (ST), European Space Agency (ESA) 4D Antarctica project (FF).

Various data recorded by Historic England relating to aerial investigation and mapping projects. N.B. This is a dynamic dataset that is constantly evolving, not only with the addition of newly completed projects, but also with the reassessment of some earlier projects. See https://historicengland.org.uk/research/methods/airborne-remote-sensing/aerial-investigation/ for further details of Historic England's work with aerial sources.It's currently not possible to provide download access to the earlier hand drawn projects, which are only available as raster files, but these can be viewed via the Aerial Archaeology Mapping Explorer. We aim to create vector monument polygons for these features as the next phase of the project.More information and help with these the layers Detailed MappingThis layer shows the detailed mapping of archaeological features derived from aerial imagery; this includes photographic imagery from many decades taken specifically for archaeological purposes, as well as other photography taken for other reasons and airborne lidar. The data are symbolised initially based on their physical form i.e. cut/negative (e.g. pit, ditch etc) or built/positive (e.g. mound, bank etc) .

    Field name
    Field alias
    Description
    Mandatory Y/N


    LAYER
    LAYER
    The layer used for mapping
    Y


    PROJECT
    PROJECT
    Project name
    Y

    PERIOD
    PERIOD
    The presumed date/period assigned to the feature (terminology from FISH thesaurus)
    Y


    MONUMENT_TYPE
    MONUMENT_TYPE
    The presumed type/function assigned to the feature (terminology from FISH thesaurus)
    Y


    EVIDENCE_1
    EVIDENCE_1
    The primary evidence for the feature e.g. cropmark, earthwork etc (terminology from FISH thesaurus)
    Y


  SOURCE_1
    SOURCE_1
    The primary source for the feature e.g. aerial photo reference, documentary source etc
    Y


  EVIDENCE_2
    EVIDENCE_2
    Where available the latest evidence for the feature e.g. cropmark, earthwork etc (terminology from FISH thesaurus) N.B. This was the latest evidence seen and does not necessarily represent the current status of the feature.
    N


  SOURCE_2
    SOURCE_2
    Where available the latest source for the feature N.B. This was the latest evidence seen and does not necessarily represent the current status of the feature.
    N


    HE_UID
    HE_UID
    Composite of Unique identifier(s) used by Historic England
    Y

    HER_NO
    HER_NO
    Composite of Unique identifier(s) used by Historic Environment Records
    N

    DHEUID_1
    DHEUID_1
    Primary Unique identifier used by Historic England
    Y

    DHEUID_2
    DHEUID_2
    Secondary Unique identifier used by Historic England. Used where a feature may relate to more than one Historic England record
    N

    DHEUID_3 ~ 5
    DHEUID_3 ~ 5
    Additional Unique identifier used by Historic England. Used where a feature may relate to more than one Historic England record
    N


    HE_URL1
    HE_URL1
    URL link to the relevant Historic England record in Heritage Gateway
    Y

    HE_URL2
    HE_URL2
    URL link to the relevant Historic England record in Heritage Gateway
    N

    HE_URL3 ~ 5
    HE_URL3 ~ 5
    URL link to the relevant Historic England record in Heritage Gateway
    N


    DHERNO_1
    DHERNO_1
    Primary unique identifier used by the relevant Historic Environment Record (HER)
    Y


    DHERNO_2
    DHERNO_2
    Secondary unique identifier used by the relevant Historic Environment Record. Used where a feature may relate to more than one HER record
    N


    DHERNO_3 ~ 5
    DHERNO_3 ~ 5
    Tertiary unique identifier used by the relevant Historic Environment Record. Used where a feature may relate to more than one HER record
    N

    DHERPREF_1
    DHERPREF_1
    Primary alternative unique identifier used by the relevant Historic Environment Record. Some HERs use the same number for both the HER No. and the reference to link to the record; others use different numbers and give them different names e.g MonUID
    Y

    DHERPREF_2
    DHERPREF_2
    Secondary alternative unique identifier used by the relevant Historic Environment Record. Some HERs use the same number for both the HER No. and the reference to link to the record; others use different numbers and give them different names e.g MonUID Used where a feature may relate to more than one HER record
    N

    DHERPREF_3 ~ 5
    DHERPREF_3 ~ 5
    Additional alternative unique identifier used by the relevant Historic Environment Record. Some HERs use the same number for both the HER No. and the reference to link to the record; others use different numbers and give them different names e.g MonUID Used where a feature may relate to more than one HER record
    N


    HER_LINK_1
    HER_LINK_1
    URL link to the relevant Historic Environment Record (HER) record in Heritage Gateway
    Y


    HER_LINK_2
    HER_LINK_2
    URL link to the relevant Historic Environment Record (HER) record in Heritage Gateway
    N


    HER_LINK_3 ~ 5
    HER_LINK_3 ~ 5
    URL link to the relevant Historic Environment Record (HER) record in Heritage Gateway
    N

The data are symbolised initially based on their physical form i.e. cut/negative (e.g. pit, ditch etc) or built/positive (e.g. mound, bank etc)

    Layer name
    Colour (Hex)
    Description

Bank #A50026 Used to outline banks, platforms, mounds and spoil heaps.

Ditch #313695 Used to outline cut features such as ditches, ponds, pits or hollow ways.

    Extent of Feature
    #FDAE61 (Dashes)
    Used to depict the extent of large area features such as airfields, military camps, or major extraction.


    Ridge and Furrow Alignment
    #74ADD1
    Line or arrow(s) (hand drawn not a symbol) depicting the direction of the rigs in a block of ridge and furrow.


    Ridge and Furrow Area
    #74ADD1 (Dots)
    Used to outline a block of ridge and furrow .


    Slope
    #4575B4
     The top of the “T” indicates the top of slope and the body indicates the length and direction of the slope. Used to depict scarps, edges of platforms and other large earthworks.

    Structure
    #F46D43
     Used to outline structures including stone, concrete, metal and timber constructions e.g., buildings, Nissen huts, tents, radio masts, camouflaged airfields, wrecks, fish traps, etc.

You can find instructions on how to create a QGIS style file (.qml) to recreate our mapping symbology in QGIS via our Open Data Downloads page under Aerial Investigation Mapping data.Monument ExtentsThis layer shows the general extent of the monuments, created from multiple sources, primarily aerial imagery, but referring to other sources such as earthwork surveys, documentary evidence and any information available from the relevant Historic Environment Record etc. This differs from the 'Detailed Mapping' layer, which shows the individual features as they appear on the ground.

    Field name
    Field alias
    Description
    Mandatory Y/N


    LAYER
    LAYER
    The layer used for mapping
    Y

    HE_UID
    HE_UID
    Composite of Unique identifier(s) used by Historic England
    Y

    HER_NO
    HER_NO
    Composite of Unique identifier(s) used by Historic Environement Records
    N


    HE_UID1
    HE_UID1
    Primary Unique identifier used by Historic England
    Y

    HE_UID2
    HE_UID2
    Secondary Unique identifier used by Historic England. Used where a feature may relate to more than one Historic England record
    N

    HE_UID3 ~ 5
    HE-UID3 ~ 5
    Additional Unique identifier used by Historic England. Used where a feature may relate to more than one Historic England record
    N


    HE_URL1
    HE_URL1
    URL link to the relevant Historic England record in Heritage Gateway
    Y

    HE_URL2
    HE_URL2
    URL link to the relevant Historic England record in Heritage Gateway
    N

    HE_URL3 ~ 5
    HE_URL3 ~ 5
    URL link to the relevant Historic England record in Heritage Gateway
    N


    HERNO_1
    HERNO_1
    Primary unique identifier used by the relevant Historic Environment Record (HER)
    Y


    HERNO_2
    HERNO_2
    Secondary unique identifier used by the relevant Historic Environment Record. Used where a feature may relate to more than one HER record
    N


    HERNO_3 ~ 25
    HERNO_3 ~ 25
    Tertiary unique identifier used by the relevant Historic Environment Record. Used where a feature may relate to more than one HER record
    N

    HERPREF_1
    HERPREF_1
    Primary alternative unique identifier used by the relevant Historic Environment Record. Some HERs use the same number for both the HER No. and the reference to link to the record; others use different numbers and give them different names e.g MonUID
    Y

    HERPREF_2
    HERPREF_2
    Secondary alternative unique identifier used by the relevant Historic Environment Record. Some HERs use the same number for both the HER No. and the reference to link to the record; others use different numbers and give them different names e.g MonUID Used where a feature may relate to more than one HER record
    N

    HERPREF_3 ~ 25
    HERPREF_3 ~ 25
    Additional alternative unique identifier used by the relevant Historic Environment Record. Some HERs use the same number for both the HER No. and the reference to link to the record; others use different numbers and give them different names e.g MonUID Used where a feature may relate to more than one HER record
    N


    HER_LINK_1
    HER_LINK_1
    URL link to the relevant Historic Environment Record (HER) record in Heritage Gateway
    Y


    HER_LINK_2
    HER_LINK_2
    URL link to the relevant Historic Environment Record (HER) record in Heritage Gateway
    N


    HER_LINK_3 ~ 25
    HER_LINK_3 ~ 25
    URL link to the relevant Historic Environment Record (HER) record in Heritage Gateway
    N


    PROJECT
    project
    Project name
    Y

Project AreaThis layer shows the extent of the

The Waterproofing Data project explored how to build communities’ resilience to flooding by engaging them in generating the data used to predict when floods will occur. The project team developed a functional citizen-science mobile app prototype and a model school curriculum, which has been successfully co-produced and trialled with more than 300 students from over 20 schools and civil protection agencies of five Brazilian states (Acre, Mato Grosso, Pernambuco, Santa Catarina and Sao Paulo). The app and curriculum enabled the communities involved to democratise flood data, raise awareness of flood risks, and co-design new initiatives to reduce disaster risks to communities. The project invited participants to co-create geospatial data that describes the perceived areas in which flooding impacted their territory. Through this process, the team sought to enhance knowledge about floods among those engaged with the project.

This dataset showcases participatory maps of three flood-prone neighbourhoods in Brazil. The maps were co-created and evaluated with the help of community members and school students living in underserved areas. Data was generated using the SketchMap tool https://sketch-map-tool.heigit.org. The tool supported i) printing paper maps of the neighbourhoods, ii) participants' drawings with the areas they perceived flooding risks, and iii) digitising those areas in a format suitable for GIS and cartography. The purpose of this process was to gather input from locals and identify areas that are prone to flooding in the two neighbourhoods. The process minimised personal data collection while the final map shows aggregated data that prevent linking data with the persons who provide it.

Initial prints, participant’s notes, and some final maps have Portuguese texts.

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Seismic Data from the previous (V1) National Data Repository, last updated on June 30th 2021.Seismic Header Information:

NDR_2dseis_eab

Navigation information for all offshore 2D seismic surveys, as reported to BEIS OPRED in seismic survey close out reports. The NSTA did not create this data set and cannot vouch for its completeness or accuracy.

NDR_3dseis

Survey outline information for all offshore 3D seismic surveys, including those acquired using Ocean Bottom Node and Ocean Bottom Cable techniques, as reported to BEIS OPRED in seismic survey close out reports. The NSTA did not create this data set and cannot vouch for its completeness or accuracy.

Reported Seismic Data:

NDR_SDS_2D_Lines

Navigation information for offshore 2D seismic surveys which had Post-Stack SEG-Y data available online in the legacy NDR, the data having been reported to the NSTA via the NDR. The seismic trace data has been migrated to the current NDR service, which also holds field and pre-stack seismic data online. Seismic data may be obtained from the NDR https://ndr.nstauthority.co.uk

NDR_SDS_3D_Outlines

Survey outline information for offshore 3D seismic surveys, including those acquired using Ocean Bottom Node and Ocean Bottom Cable techniques, which had Post-Stack SEG-Y data available online in the legacy NDR, the data having been reported to the NSTA via the NDR. The seismic trace data has been migrated to the current NDR service, which also holds field and pre-stack seismic data online. Seismic data may be obtained from the NDR https://ndr.nstauthority.co.uk

These maps are a selection of the scanned report maps and inserts. They have been gathered at vaious scales and are fully described in their source reports.

Nanyuki Maralal Physiographic sketch map of the Maralal area and districts to the west

Degree Sheet: 69, Sheet Number (Directorate of Overseas Survey): Not applicable, Report: 24

Dieser Datensatz wird nun zurückgezogen und durch Folgendes ersetzt:

Reservoir Flood Extents - Fluvial Contribution (National) (englisch) https://environment.data.gov.uk/dataset/db114020-465a-412b-b289-be393d995a75 Reservoir Flood Extents - Wet Day (National) (englisch) https://environment.data.gov.uk/dataset/d81646cf-37e5-4e71-bbcf-b7d5b9ca3a1c Reservoir Flood Extents - Dry Day (National) (englisch) https://environment.data.gov.uk/dataset/c66ee97f-49d2-454e-9a19-d48a47bd22ad

Dies ist die vereinfachte Version der Gliederung Reservoir Flood Map Outline (Tiefe), wie auf der gov.uk Flood Risk Website gezeigt. Dies ist eines von 3 verfügbaren Web-Mapping-Diensten "Überschwemmungsrisiko aus Reservoirs"; Maximale Hochwassertiefe, maximale Hochwasserausdehnung, maximale Hochwassergeschwindigkeit.

Vereinfacht in diesem Zusammenhang bezieht sich auf die Tatsache, dass im Gegensatz zum detaillierten Produkt einzelne Reservoir-Hochwasserkartentiefen nicht separat dargestellt werden, und eine zusammengeführte Gliederung zeigt die maximale Hochwassertiefe für alle Reservoir-Hochwasserszenarien zusammen.

Dies ist eine Datenschicht, die eine kombinierte Reservoir-Hochwasserkarte für 2.092 große erhöhte Reservoirs einschließlich zugeordneter Daten zeigt. Die Daten zeigen die maximale Tiefe der Überschwemmungen, sollten Reservoirs durchbrochen werden, und obwohl die Lage jedes Reservoirs abgeleitet werden kann, werden sie nicht explizit auf den Karten angezeigt. Die Reservoir Flood Map Maximum Flood Outline (Depth) in ihrer vereinfachten Form wird extern als Flooding Risk of Reservoirs – Maximum Flood Depth bezeichnet.

Die Reservoir Flood Map Outline (Depth) zeigt die maximalen Hochwassertiefen, die zu erwarten wären, wenn ein Reservoir ausfallen und das Wasser, das es enthält, freisetzen würde. Da dies eine Vorhersage eines glaubwürdigen Worst-Case-Szenarios ist, ist es unwahrscheinlich, dass eine tatsächliche Überschwemmung so tief wäre. Diese Daten sind nur für die Notfallplanung bestimmt und für groß angelegte Hochwasserrisikobewertungen nicht zuverlässig.

Bitte beachten Sie, dass nur Hochwasserkarten für große Stauseen angezeigt werden. Hochwasserkarten werden nicht für kleinere Reservoirs oder für Reservoirs angezeigt, die nach Beginn der Reservoirkartierung im Frühjahr 2009 in Betrieb genommen wurden.

Hinweishinweis: Nur die Kategorien Maximale Ausdehnung, Geschwindigkeit und Tiefe sind unter den Standard-OGL-Bedingungen verfügbar, wenn sie als WMS geliefert werden. Dies schließt die zugrunde liegenden Daten aus. Erklärung zur Namensnennung: © Copyright und/oder Datenbankrecht der Umweltbehörde 2019. Alle Rechte vorbehalten.

This dataset is refreshed on a weekly basis from the datasets the team works on daily.Last update date: 27 June 2025.National Highways Operational Highway Boundary (RedLine) maps out the land belonging to the highway for the whole Strategic Road Network (SRN). It comprises two layers; one being the an outline and another showing the registration status / category of land of land that makes up the boundary. Due to the process involved in creating junctions with local highway authority (LHA) roads, land in this dataset may represent LHA highway (owned by National Highways but the responsibility of the LHA to maintain). Surplus land or land held for future projects does not form part of this dataset.The highway boundary is derived from:Ordnance Survey Mastermap Topography,HM Land Registry National Polygon Service (National Highway titles only), andplots researched and digitised during the course of the RedLine Boundary Project.The boundary is split into categories describing the decisions made for particular plots of land. These categories are as follows:Auto-RedLine category is for plots created from an automated process using Ordnance Survey MasterMap Topography as a base. Land is not registered under National Highways' name. For example, but not limited to, unregistered ‘ancient’ highway vested in Highways England, or bridge carrying highways over a rail line.NH Title within RedLine category is for plots created from Land Registry Cadastral parcels whose proprietor is National Highways or a predecessor. Land in this category is within the highway boundary (audited) or meets a certain threshold by the algorithm.NH Title outside RedLine category is for plots created in the same way as above but these areas are thought to be outside the highway boundary. Where the Confidence is Low, land in this category is yet to be audited. Where the Confidence is High, land in this category has been reviewed and audited as outside our operational boundary.National Highways (Technician) Data category is for plots created by National Highways, digitised land parcels relating to highway land that is not registered, not yet registered or un-registerable.Road in Tunnel category, created using tunnel outlines from Ordnance Survey MasterMap Topography data. These represent tunnels on Highways England’s network. Land is not registered under National Highways' name, but land above the tunnel may be in National Highways’ title. Please refer to the definitive land ownership records held at HM Land Registry.The process attribute details how the decision was made for the particular plot of land. These are as follows:Automated category denotes data produced by an automated process. These areas are yet to be audited by the company.Audited category denotes data that has been audited by the company.Technician Data (Awaiting Audit) category denotes data that was created by National Highways but is yet to be audited and confirmed as final.The confidence attribute details how confident you can be in the decision. This attribute is derived from both the decisions made during the building of the underlying automated dataset as well as whether the section has been researched and/or audited by National Highways staff. These are as follows:High category denotes land that has a high probability of being within the RedLine boundary. These areas typically are audited or are features that are close to or on the highway.Moderate category denotes land that is likely to be within the highway boundary but is subject to change once the area has been audited.Low category denotes land that is less likely to be within the highway boundary. These plots typically represent Highways England registered land that the automated process has marked as outside the highway boundary.Please note that this dataset is indicative only. For queries about this dataset please contact the GIS and Research Team.