Textual Amendments
In addition to the definitions set out in Article 2, the following definitions shall apply:
‘ digital elevation model ’ (DEM) means Digital Surface Model (DSM) or Digital Terrain Model (DTM).
‘ digital surface model ’ (DSM) means a surface describing the three dimensional shape of the Earth's surface, including all static features placed on it. Temporary phenomena do not form part of the surface, but due to the technical difficulties in removing them some of these features may also be present in the surface.
‘ digital terrain model ’ (DTM) means a surface describing the three dimensional shape of the Earth's bare surface, excluding as possible any other features placed on it.
‘ elevation ’ means a vertically-constrained dimensional property of an spatial object consisting of an absolute measure referenced to a well-defined surface which is commonly taken as origin.
‘ height ’ means an elevation property measured along a plumb line in a direction opposite to Earth's gravity field (upwards).
‘ depth ’ means an elevation property measured along a plumb line in a direction coincident to Earth's gravity field (downwards).
The types specified for the spatial data theme Elevation are structured in the following packages:
Elevation – Base Types
Elevation – Grid Coverage
Elevation – Vector Elements
Elevation – TIN
Spatial data sets describing the morphology of land elevation shall be made available at least using the spatial object types included in the package Elevation – Grid Coverage.
Spatial data sets describing the morphology of bathymetry shall be made available at least using the spatial object types included in either the package Elevation – Grid Coverage or the package Elevation – Vector Elements.
Enumeration type which determines the elevation property which has been measured or calculated.
| Value | Definition |
|---|---|
| height | Elevation property measured along a plumb line in a direction opposite to Earth's gravity field (upwards). |
| depth | Elevation property measured along a plumb line in a direction coincident to Earth's gravity field (downwards). |
Enumeration type which determines the elevation surface with regard to its relative adherence to the Earth's bare surface.
| Value | Definition |
|---|---|
| DTM | Digital terrain model. |
| DSM | Digital surface model. |
The package Elevation – Grid Coverage contains the spatial object type Elevation Grid Coverage.
Continuous coverage which uses a systematic tessellation based on a regular rectified quadrilateral grid to cover its domain, where the elevation property value is usually known for each of the grid points forming this domain.
This type is a sub-type of RectifiedGridCoverage.
| Attribute | Definition | Type | Voidability |
|---|---|---|---|
| beginLifespanVersion | Date and time at which this version of the spatial object was inserted or changed in the spatial data set. | DateTime | voidable |
| domainExtent | Extent of the spatiotemporal domain of the coverage. | EX_Extent | |
| endLifespanVersion | Date and time at which this version of the spatial object was superseded or retired in the spatial data set. | DateTime | voidable |
| inspireId | External object identifier of the spatial object. | Identifier | |
| propertyType | Attribute determining the elevation property represented by the elevation grid coverage. | ElevationPropertyTypeValue | |
| surfaceType | Attribute indicating the type of elevation surface that the coverage describes in relation to the Earth's bare surface. | SurfaceTypeValue |
| Association role | Definition | Type | Voidability |
|---|---|---|---|
| contributingElevationGridCoverage | Reference to the elevation grid coverages that compose an aggregated elevation grid coverage. The association has additional properties as defined in the association class ElevationGridCoverageAggregation. | ElevationGridCoverage |
The grid dimension shall always be 2 for an elevation grid coverage.
The domainExtent shall be at least populated with a subtype of EX_GeographicExtent.
The coordinate reference system used to reference the grid shall be provided.
All the ElevationGridCoverage instances, to which an aggregated ElevationGridCoverage instance refers, shall share the same orientation of grid axes and the same grid spacing in each direction.
The origin of the grid shall be described in two dimensions.
The values in the range set shall be described by the Float type.
Geometrical characteristics of the elevation grid coverage aggregation.
This type is an association class.
| Attribute | Definition | Type | Voidability |
|---|---|---|---|
| contributingFootprint | Geometric representation delineating the geographic area of the elevation grid coverage that contributes to the aggregated elevation grid coverage. | GM_MultiSurface |
The package Elevation – Vector Elements contains the following spatial object types:
Elevation Vector Object
Spot Elevation
Contour Line
Breakline
Void Area
Isolated Area
Elevation spatial object forming part of a vector data set, which participates in the description of the elevation property of a real world surface. It consists of an identity base for all vector objects which can be included as part of an elevation data set.
This type is abstract.
| Attribute | Definition | Type | Voidability |
|---|---|---|---|
| beginLifespanVersion | Date and time at which this version of the spatial object was inserted or changed in the spatial data set. | DateTime | voidable |
| endLifespanVersion | Date and time at which this version of the spatial object was superseded or retired in the spatial data set. | DateTime | voidable |
| localDepthDatum | Identification of a local vertical coordinate reference system not included in a registry, which is used to refer depth measurements. | ChartDatum | |
| propertyType | Attribute categorizing the elevation vector object as a land-elevation or a bathymetry spatial object. It determines the elevation property represented by the object. | ElevationPropertyTypeValue |
Point spatial object which describes the elevation of an Earth's surface at a specific location. It provides a single elevation property value.
This type is a sub-type of ElevationVectorObject.
| Attribute | Definition | Type | Voidability |
|---|---|---|---|
| classification | Class of spot elevation according to the LAS specification of the American Society for Photogrammetry and Remote Sensing (ASPRS). | SpotElevationClassValue | voidable |
| geographicalName | A geographical name that is used to identify a named land or water body's floor location in the real world, which is represented by the spot elevation spatial object. | GeographicalName | voidable |
| geometry | Represents the geometric properties of the spatial object. | GM_Point | |
| propertyValue | Value of the elevation property of the spatial object referred to a specific vertical coordinate reference system. | DirectPosition | |
| spotElevationType | The type of elevation spot. | SpotElevationTypeValue | voidable |
The dimension of the property value coordinate shall be 1
The property value shall be expressed referring to a vertical coordinate reference system
Linear spatial object composed of a set of adjoining locations characterized by having the same elevation property value. It describes, together with other contour lines present in the area, the local morphology of the Earth's surface.
This type is a sub-type of ElevationVectorObject.
| Attribute | Definition | Type | Voidability |
|---|---|---|---|
| contourLineType | The type of contour line with regard to the normal contour vertical interval (if any). | ContourLineTypeValue | voidable |
| downRight | Property indicating that the contour line spatial object is digitized in a way that the height of the elevation surface is lower at the right side of the line. | Boolean | voidable |
| geometry | Represents the geometric properties of the spatial object. | GM_Curve | |
| propertyValue | Value of the elevation property of the spatial object referred to a specific vertical coordinate reference system. | DirectPosition |
The dimension of the property value coordinate shall be 1.
The property value shall be expressed referring to a vertical coordinate reference system.
A line of a critical nature which describes the shape of an elevation surface and indicates a discontinuity in the slope of the surface (i.e. an abrupt change in gradient). Triangles included within a TIN model must never cross it.
This type is a sub-type of ElevationVectorObject.
| Attribute | Definition | Type | Voidability |
|---|---|---|---|
| breakLineType | The type of break line with regard the natural or man-made real world characteristic it represents, or the specific function it has in calculating a Digital Elevation Model (DEM). | BreakLineTypeValue | |
| geometry | Represents the geometric properties of the spatial object. | GM_Curve | |
| manMadeBreak | Line which represents an elevation break due to a man-made construction present on the terrain. | Boolean | voidable |
Area of the Earth's surface where the elevation model is unknown because of missing input data. This area shall be excluded from a DEM.
This type is a sub-type of ElevationVectorObject.
| Attribute | Definition | Type | Voidability |
|---|---|---|---|
| geometry | Represents the geometric properties of the spatial object. | GM_Surface |
Delimitation of an area of the Earth's surface where an isolated part of the elevation model exists. Its outside surroundings have no elevation information.
This type is a sub-type of ElevationVectorObject.
| Attribute | Definition | Type | Voidability |
|---|---|---|---|
| geometry | Represents the geometric properties of the spatial object. | GM_Surface |
Local vertical coordinate reference system which is used to refer and portray depth measurements as property values.
| Attribute | Definition | Type | Voidability |
|---|---|---|---|
| datumWaterLevel | Water level determining the origin of depth measurements for the chart datum. | WaterLevelValue | |
| offset | Relative difference between the height of each reference point and the height of the water level determining the chart datum. | Measure | |
| referencePoint | Geographical position(s) of: - Case A: a single point which is used to refer depth values within the geographical scope of the chart datum. - Case B: a set of points where water level measurements are performed to determine the water level of the chart datum. | GM_Point | |
| scope | Geographic scope in which the local depth datum is practically used. | EX_Extent |
List of possible categories of contour lines based on the equidistance parameter of the data set.
| Value | Definition |
|---|---|
| master | Contour at a vertical distance which is multiple to the equidistance parameter (corresponding to a certain multiple of the normal contour vertical interval) associated with the nominal scale. |
| ordinary | Contour at the equidistance parameter (corresponding to the normal contour vertical interval) associated with the nominal scale, and which is not a master contour. |
| auxiliary | A supplementary contour – not corresponding to the normal contour vertical interval – estimated or interpolated from surrounding contours, used in areas where there is insufficient height information for elevation mapping purposes or to control the creation of a digital elevation model. |
List of possible type values for break lines based on the physical characteristics of the break line [in the elevation surface].
The allowed values for this code list comprise the values specified in the table below and narrower values defined by data providers.
| Value | Name | Definition |
|---|---|---|
| bottomOfSlope | bottom of slope | Break line representing the lower boundary of an area having a constant slope in the terrain surface, typically varying approximately between 2° and 40°. |
| changeInSlope | change in slope | Break line representing a collection of adjoining points where the terrain has an abrupt change in slope. |
| flatAreaBoundary | flat area boundary | Break line that delimits an isolated part of the territory where the elevation model has to be constrained at the same elevation value. |
| formLine | form line | Break line representing a local direction in which the elevation surface being described takes the greatest slope. |
| topOfSlope | top of slope | Break line representing the upper boundary of an area having a constant slope in the terrain surface, typically varying approximately between 2° and 40°. |
Possible classification values for spot elevations based on the LAS specification maintained by the American Society for Photogrammetry and Remote Sensing (ASPRS).
The allowed values for this code list comprise any values defined by data providers.
Data providers may use the values specified in the INSPIRE Technical Guidance document on Elevation.
Possible values for spot elevation points that describe a singularity of the surface.
The allowed values for this code list comprise the values specified in the table below and narrower values defined by data providers.
| Value | Name | Definition |
|---|---|---|
| depression | depression | Point that represents a part of the relief of the land surface or water body's floor surface that is lower in elevation when compared to its surrounding points. |
| formSpot | form spot | A supplementary spot height, estimated or interpolated from surrounding heights, in areas where few contour lines or other height information exist. |
| generic | generic | Spot elevation spatial object not fulfilling the description of any of the other values in the current code list. |
| pass | pass | Lower point of a depression within a ridge alignment, generally opened along the crest line, which allow passing from one slope of the surface to another. |
| summit | summit | Highest point of a prominence in the relief of a land surface or a water body's floor surface. |
The package ‘ Elevation – TIN ’ contains the spatial object type Elevation TIN.
Collection of elevation spatial objects forming a particular tessellation of the space based on a Triangulated Irregular Network (TIN) according to the geometry GM_Tin defined in ISO 19107:2003. Its components are a set of control points whose elevation property values are known, and a set of break lines and stop lines.
| Attribute | Definition | Type | Voidability |
|---|---|---|---|
| beginLifespanVersion | Date and time at which this version of the spatial object was inserted or changed in the spatial data set. | DateTime | voidable |
| endLifespanVersion | Date and time at which this version of the spatial object was superseded or retired in the spatial data set. | DateTime | voidable |
| geometries | Represents the collection of geometric properties of the elevation TIN spatial object. | GM_Tin | |
| inspireId | External object identifier of the spatial object. | Identifier | |
| propertyType | Attribute determining the elevation property represented by the elevation TIN. | ElevationPropertyTypeValue | |
| surfaceType | Attribute indicating the type of elevation surface that the elevation TIN describes in relation to the Earth's bare surface. | SurfaceTypeValue |
two-dimensional geodetic coordinates (latitude and longitude) based on a datum specified in 1.2 of Annex II and using the parameters of the GRS80 ellipsoid;
plane coordinates using the ETRS89 Lambert Conformal Conic coordinate reference system;
plane coordinates using the ETRS89 Transverse Mercator coordinate reference system.
The grid specified in Section 2.2.1 of Annex II shall not be used.
by providing the metadata element Temporal reference for each spatial object through the metadata attribute of the spatial object type ElevationGridCoverage;
by providing the metadata element Temporal reference required by Regulation (EC) No 1205/2008 as a temporal extent.
| Layer Name | Layer Title | Spatial object type |
|---|---|---|
| EL.BreakLine | Break Line | BreakLine |
| EL.ContourLine | Contour Line | ContourLine |
| EL.IsolatedArea | Isolated Area | IsolatedArea |
| EL.SpotElevation | Spot Elevation | SpotElevation |
| EL.VoidArea | Void Area | VoidArea |
| EL.ElevationGridCoverage | Elevation Grid Coverage | ElevationGridCoverage |
| EL.ElevationTIN | Elevation TIN | ElevationTIN] |