Development of an automatic tide gauge processing system

There are many tide gauges around the world for which research quality data is not available for sea-level studies, including gauges that are maintained primarily for tsunami monitoring. In some cases high-frequency data is available for download through the Intergovernmental Oceanographic Commission (IOC) http://www.iocsealevelmonitoring.org, but manual QC has been too labour intensive. In this report we describe Matlab software for automatic quality control (QC) for tide gauges, including generalised comparison of instrument channels, fitting and predicting tides using irregular high-frequency data. We include details of the implementation, testing, and known capability and weaknesses.