What is VORF?

What is VORF?

What is VORF? High resolution digital models of reference surfaces such as mean sea level (MSL), lowest astronomical tide (LAT) and Chart Datum (CD) all modelled with respect to the terrestrial reference frame used for GPS/GNSS positioning: ETRF89 (or ITRF). The software to transform rapidly and robustly between these different datums.

How to get chart datum in ETRF89?

Historically Chart Datum is quoted either with respect to a local benchmark or to the national datum (such as OD Newlyn). To acquire the heights of Chart Datum in ETRF89, the primary method is to use a transformation model which provides the link to a national datum.

What is a chart datum?

The definition of Chart Datum varies depending on location and tidal regime. In the UK and Ireland CD is generally defined as being Lowest Astronomical Tide, or as being very close to it.

How can we extend our knowledge of vertical datums offshore?

With the advent of technology such as GPS and LIDAR, and increasing interest in areas such as the coastal zone, there is an imperative need for a system that will seamlessly transform between all the different reference surfaces and extend our knowledge of vertical datums offshore.