Geodetic Mark Dataset Index of Tables

The geodetic data download includes information from 23 tables in Landonline. Most of these tables are used to hold information about both cadastral and geodetic marks - these extracts comprise only the rows relating to geodetic marks. For the purposes of this extract a geodetic mark is defined as a mark which has a geodetic code.

Geodetic marks in Landonline are primarily represented in two tables. The crs_node table defines the logical location to which the mark refers, and the crs_mark tables defines the physical mark at that location. Several marks may refer to the same node, but only one will apply at one time. The mark currently associated with the node is identified by its status, which is 'COMM' (for commissioned).

Each mark may have several names associated with it. These names are stored in the crs_mark_name table and are distinguished by their type. For geodetic work the most important name is the geodetic code, which has type 'CODE'.

Similarly, each node may have many coordinates associated with it. These may include coordinates in different datums (for example NZGD200, NZGD49, and orthometric height datums), and coordinates that are either proposed new coordinates or decommissioned old coordinates. All these coordinates are stored in the crs_coordinate table, and are distinguished by coordinate system and status. The current authorised coordinate of a node for a datum is the coordinate with status 'AUTH'.

The crs_coordinate_sys table lists all the coordinate systems that are used in Landonline. Each coordinate system is defined in terms of a datum in the crs_datum table, and a coordinate type in the crs_coordinate_tpe table. The crs_cord_order table lists the coordinate orders that apply for each datum.

Each time a mark is surveyed or maintained is recorded in the crs_mrk_phys_state table.

The following list defines all the tables that are included in the geodetic data set.

Data file	Table name	Description
adj1.csv	crs_adjustment_run	Defines adjustment runs used to calculate coordinates and source information for coordinates converted from the old geodetic database.
aud1.csv, aud2.csv	crs_audit_detail	Logs significant changes to records in the other tables.
coo1.csv	crs_coordinate	Holds all coordinates of nodes (including orthometric height coordinates)
cos.csv	crs_coordinate_sys	Lists all coordinate systems used in Landonline
cot.csv	crs_coordinate_tpe	Defines the representations of coordinates (lat/lon, projections)
cop.csv	crs_cor_precision	Lists the number of decimal places used to display coordinates of different types and orders
cor.csv	crs_cord_order	Lists the coordinate orders that may be assigned to coordinates.
dtm.csv	crs_datum	Lists the datums to which coordinates may be referenced
elp.csv	crs_ellipsoid	Lists the ellipsoid models used.
loc1.csv	crs_locality	Lists land districts and other areas of interest.
mnt1.csv	crs_maintenance	Tracks maintenance required on marks
mrk1.csv	crs_mark	Defines the physical marks associated with nodes
mkn1.csv	crs_mark_name	Lists the various names used to refer to a mark including the geodetic code
mps1.csv	crs_mrk_phys_state	Lists maintenance done and the state of the mark, beacon, and protection structure.
nod1.csv	crs_node	Lists the nodes - the abstract points to which coordinates are referenced.
npo1.csv	crs_node_prp_order	Lists the proposed order of nodes for which coordinates have not yet been calculated.
orj1.csv	crs_ordinate_adj	Relates each coordinate to the adjustment that created it.
ort.csv	crs_ordinate_type	Defines the types of ordinate (lat, lon, height) used.
sit1.csv	crs_site	Lists sites at which one or more survey marks are located.
slo.csv	crs_site_locality	Relates sites to land districts
sco.csv	crs_sys_code	Lists codes used in the database
scg.csv	crs_sys_code_group	Defines the various groups of codes used in the database.
uom.csv	crs_unit_of_meas	Defines the units (such as metres) used in the database.