Download Geodetic Mark Data
LINZ maintains geodetic data in Landonline - a system which integrates the geodetic, cadastral, and land titles data. Landonline stores information about the geodetic marks and also observations between the marks. Find out more about Landonline.
The Landonline geodetic mark data can be searched online or accessed via a KML file.
The geodetic mark data is also freely available for download. A simple list of geodetic marks can be downloaded from /ftp/gdb/simple/. This consists of just the mark codes, names, and New Zealand Geodetic Datum latitude, longitude, and ellipsoidal height for each mark. This data set is updated daily.
Alternatively the complete geodetic mark data set can be downloaded. This is a relatively complex data set comprising 23 tables of data. The complete data set is compiled monthly, with updates being available on a daily basis (there may be some days when the daily update is not generated due to other system activities). Documentation of these tables can be downloaded in HTML format from /ftp/gdb/gdb_docs.zip (zip 54KB). To view the documentation, unzip the contents into a directory and open the file index.html with a web browser.
The monthly extracts are available at /ftp/gdb/full/. The extracts are in files named gdb_full_yyyymmddhhmm.zip where yyyymmddhhmm is the date and approximate time that the data was extracted from Landonline. The monthly extract usually happens on the first weekend of each month.
The daily incremental updates are available at /ftp/gdb/incremental/ and are stored in files named gdb_inc_yyyymmddhhmm.zip.
These data sets do not include mark diagrams and site photographs, which are available for some of the marks. Images for geodetic marks may be downloaded from /ftp/gdb/images/marks. For a mark with code ABCD the images are stored in subdirectory named A/AB/ABC/ABCD. A list of all images in these directories is available as /ftp/gdb/images/image-list.csv (3.8MB) (also available as a zip file - 402KB). This list is updated daily.
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. more...
Simplified data model of the geodetic mark dataset tables
An interactive graphical data model. more...
Geodetic mark dataset tables
The full descriptions of each table. more...
Geodetic mark data using incremental extracts
An up-to-date set of geodetic data is built by downloading a monthly full data set, and then applying all daily incremental updates after the date of the monthly data set. more...
Geodetic mark data file formats
Each geodetic data extract is supplied as a zip archive which can be opened with any of the standard ZIP file utilities such as WinZip, PKzip, or InfoZip. more...
