Landonline: Datum

Licence

Creative Commons Attribution 3.0 New Zealand

You may use this work for commercial purposes.

You must attribute the creator in your own works.

1251
171
Updated
22 Jul 2017

This dataset was last updated on LINZ Data Service on 22 Jul 2017.

Please read: This table is part of the comprehensive Full Landonline Dataset and is designed for use only by data professionals who require the complex version of our property ownership and boundary data for advanced uses.


A Datum is a complete system for enabling Coordinates to be assigned to Nodes. A datum is prescribed by the appropriate authority from which it derives its validity. All Coordinates will be in terms of a Datum. A Datum also provides a spatial standard for the alignment of Reduced Observations via a Datum Calibration. Most Reduced Observations are Datum dependent but there are specific Reduced Observation types which are Datum independent. The Datum entity contains information about the official geodetic Datum used in Land Information NZ databases and other important Datum’s used to spatially reference source data (e.g.. Reduced Observations) or output data or products (e.g.. Coordinates, Digital Cadastral Database, topographic maps, hydrographic charts, etc). The Datum entity includes objects which, strictly, are reference frames rather than datum’s but the distinction is a fine technical point which is of no great consequence. The Datum entity includes vertical reference surfaces such as leveling datum’s, various tidal surfaces including Mean Sea Level, the geoid, datum ellipsoids, etc. For a Datum to maintain accuracy over a significant area it must be geodetic. Examples of non-geodetic datum’s are the Old Cadastral Datums. These do not account for the curvature of the earth and therefore can only maintain accuracy over a limited part of the earth's surface.

Please refer to the LDS Full Landonline Data Dictionary and Models for detailed metadata about this table.

License

Creative Commons Attribution 3.0 New Zealand

You may use this work for commercial purposes.

You must attribute the creator in your own works.

Information
Category Full Landonline Dataset
Tags New Zealand
Metadata ISO 19115/19139, Dublin Core
Technical Details
Table ID 1713
Data type Table
Row count 365
Primary key id
Columns id, name, type, dimension, ref_datetime, status, elp_id, ref_datum_code, code, audit_id
Services Web Feature Service (WFS)
History
Added 24 Oct 2013
Last updated 22 Jul 2017
Revisions 116 - Browse all revisions
Current revision Imported on July 22, 2017 from Postgres .