NZ Topo - object class height_pnt
This page describe the height_pnt object class used to represent objects in the NZTopo topographic database.
A height above a vertical datum, represented on a map by a dot locator with the elevation printed beside the dot. Unlike trigonometrical stations, spot heights are not identifiable on the ground
Spot heights were captured by photogrammetry when the first edition 1:50,000 maps were created between 1976 and 1998. Height points are not present where a beaconed trig is located, even if the beaconed trig is not heighted.
Mostly a generalised subset of those held in the Topo50 data are held Topo250 data and shown on the Topo250 printed maps; there will be instances of historic heights that exist in the Topo250 data, which don't appear in the Topo50, eg. in locations where, in the Topo50 data, a beaconed trig without a height value is present.
Spot heights are only available in the areas captured by photogrammetry
Important information: Height_pnts in forest and snow areas may be less accurate.
|Entity class||SPOT HEIGHT|
|Additional entity class||Not applicable|
|Entity source||Proposed NZ Std Entity|
|Map series||Topo50 Topo250 Ant50|
|LSLIFF object class||55|
|Attribute description||Attribute values*|
|The elevation above mean sea level.|
|A unique identifier for use on Topo50 data in the LINZ Data Service. This is not a universal ID. The intention is to manage these ID’s as persistent, however this is not guaranteed and there will be instances where what appears to be a minor change to a feature may result in a new ID being assigned.|
* See explanation of attribute values for more information about how attribute values are represented.
|7||2012-08-28||Updated map image and aerial view; added representation specification and example feature photographs|
|6||2012-08-28||Added scale-specific definitions|
|2||1999-10-01||updated data type|