GML Feature types

The feature types within the contours enable their representation as individual features to allow for easier interpretation; for example, the contours can be drawn as different colours to highlight the index contours, the high-water mark, and spot heights over a certain value. The contours and tidelines have been rounded to two decimal places.

The column names have been reformatted to facilitate compliance with Esri software.

Contour line feature type

Column name	Type	Description
+geometry	GM_LineString	The structure of the feature
+propertyValue	Distance	The length of the contour
+contourLineType	String	master ordinary auxiliary

The ContourLine sub-type value names align with INSPIRE draft elevation specification. The terms 'master' and 'ordinary' represent the more traditionally recognised terms index and standard (contours) respectively.

SpotHeight feature type

Column name	Type	Description
+geometry	GM_Point	The structure of the feature.
+propertyValue	Distance	The z value (height above Newlyn, or other British height datum) of the feature.
+spotHeightType	String	formSpot generic mountainPass summit

At launch only the sub-type value 'generic' has been used but the other values provide functionality to enrich the attribution if required in a later product release.

LandWaterBoundary feature type

Column name	Type	Description
+geometry	GM_LineString	The structure of the feature.
+propertyValue	Distance	The length of the boundary line.

Column name	Type	Description
+waterLevelCategory	String	meanHighWater meanLowWater meanHighWaterSprings meanLowWaterSprings

At launch only the sub-type value 'generic' has been used but the other values provide functionality to enrich the attribution if required in a later product release.

Example of the ContourLine feature type

<os:member>
<os:ContourLine gml:id="os.t5.sx98se.175">
<os:geometry>
<gml:LineString srsName="urn:ogc:def:crs:EPSG::27700" gml:id="os.t5.sx98se.175.geom">
<gml:posList>295487.08 80000 295481.21 80001.48 295480.55 80001.23
295481.75 80000</gml:posList>
</gml:LineString>
</os:geometry>
<os:propertyValue uom="m">15</os:propertyValue>
<os:contourLineType>ordinary</os:contourLineType>
</os:ContourLine>
</os:member>
SpotHeight feature type
<os:member
<os:SpotHeight gml:id="os.t5.sx98se.0">
<os:geometry>
<gml:Point srsName="urn:ogc:def:crs:EPSG::27700" gml:id="os.t5.sx98se.0.geom">
<gml:pos>299161.48 84990.56</gml:pos>
</gml:Point>
</os:geometry>
<os:propertyValue uom="m">31.9</os:propertyValue>
<os:spotHeightType>generic</os:spotHeightType>
</os:SpotHeight>
</os:member>
Example of the LandWaterBoundary feature types
<os:member>
<os:LandWaterBoundary gml:id="os.t5.sx98se.17">
<os:geometry>
<gml:LineString srsName="urn:ogc:def:crs:EPSG::27700" gml:id="os.t5.sx98se.17.geom">
<gml:posList>297786.59 81469.64 297783.26 81469.75 297783.26
81466.75 297786.59 81469.64</gml:posList>
</gml:LineString>
</os:geometry>
<os:propertyValue uom="m">1.62</os:propertyValue>
<os:waterLevelCategory>meanHighWater</os:waterLevelCategory>
</os:LandWaterBoundary>
</os:member>