ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata
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Reference System Info
Reference System Identifier
Antarctic Geodetic Marks
This dataset provides information about the position, position accuracy, mark name, mark type, condition and unique four letter code for geodetic marks in terms of New Zealand's official geodetic datum for the Ross Dependency.
This dataset only includes marks that are within Antarctica. These positions have been generated using geodetic observations such as precise differential GPS or electronic distance and theodolite angles measurements. The positions are either 2D or 3D depending of the availability of this measurement data.
The source data is from Land Information New Zealand's (LINZ) Landonline system where it is used by Land Surveyors. This dataset is updated daily to reflect changes made in the Landonline.
Accuracy ============ Geodetic marks with a coordinate order of 5 or less have been positioned in terms of Ross Sea Region Geodetic Datum 2000 (RSRGD2000) using precise differential GPS techniques. Marks with order 6 have been positioned in terms of RSRGD2000 using precise horizontal angles and distance measurements. Lower order marks (order 7 and greater) are derived from lower accuracy measurement techniques or historical datum transformations, and may be significantly less accurate.
The accuracy of RSRGD2000 coordinates is described by a series of 'orders' classifications. Positions in terms of RSRGD2000 are described by three-dimensional coordinates (latitude, longitude, ellipsoidal height). The accuracy of a survey mark is indicated by its order. Orders are classifications based on the quality of the coordinate in relation to the datum and in relation to other surrounding marks. For more information see http://www.linz.govt.nz/geodetic/datums-projections-heights/heights/coordinate-orders/
Note that the accuracy applies at the time the mark was last surveyed. Refer to the web geodetic database for historical information about mark coordinates.
Note also that the existence of a mark in this dataset does not imply that there is currently a physical mark in the ground - the dataset includes destroyed or lost historical marks. The geodetic database provides more information on the mark status, valid at last time it was visited by LINZ.
This simplified geodetic mark dataset has been created for easy viewing and downloading for the LDS.
It only contains Ross Sea Region Geodetic Datum 2000 (RSRGD2000) positions. If vertical information is required please use the Geodetic Antarctic Vertical Mark Data (Simple). More detailed data such as site photos or coordinate system position data is required please use the full geodetic datasets or directly refer to the web geodetic database at http://www.linz.govt.nz/gdb.
Released under Creative Commons Attribution 4.0 International with:
Following Disclaimers: 1. This data is made available through the LINZ Data Service and is based on information contained with Landonline (New Zealand's Official Title and Cadastral System)
Following Attribution: If you publish, distribute or otherwise disseminate this work to the public without adapting it, the following attribution to Land Information New Zealand should be used: 'CC BY 4.0 Land Information New Zealand’
If you adapt this work in any way or include it in a collection, and publish, distribute or otherwise disseminate that adaptation or collection to the public, the following attribution to Land Information New Zealand should be used: ‘Contains data sourced from the LINZ Data Service and licensed for reuse under CC BY 4.0.'
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