Land Information New Zealand (LINZ) has started broadcasting real-time, one second Global Navigation Satellite System (GNSS) data.
The data is streamed free-of-charge from 39 Continuously Operating Reference Stations (CORS) throughout New Zealand. This includes 34 LINZ PositioNZ stations and 5 stations which are part of the GeoNet project run by GNS Science. Users can connect to a data stream in the field using their GNSS receiver and a cellular connection. This enables Real-Time Kinematic (RTK) positioning to be carried out, without the need to set up a separate base station.
To help monitor the reliability of the network, LINZ has established an online monitoring tool on the PositioNZ-RT webpage, found here.
One of the key reliability indicators for real-time data streaming is latency. The latency is the length of time between data arriving at the PositioNZ station and being transmitted to the user’s receiver. If this time interval is too large, it may not be possible to determine a position, or the position may not be accurate. Latencies of less than one second are desirable. While most of the data streams have latencies that are less than one second, there are times when this criteria is not met for certain stations. Users will now be able to track the latencies of their preferred stations via a summary table and detailed plots. There is also information about data completeness for each station.
If you are interested in accessing the real-time, one-second data streams, contact LINZ via the “Access PositioNZ-RT data” section at http://apps.linz.govt.nz/positionz/rt/index.php
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