Contact usBookmark this pagePrint pageResize downResize up

Reference mark survey

Image of Reference Mark Survey designThe CORS Reference Mark Survey (RM survey) involves periodic terrestrial monitoring of a CORS monument using at least three stable reference marks. The RM survey, which is undertaken for all Tier 2 AusCORS sites, involves both a horizontal and a levelling (EDM heighting) survey. In NSW, Spatial Services – Department of Finance, Services and Innovation conducts these surveys during installation, 6 and 18 months after installation, and then repeated every 2 years thereafter.

This stability of Tier 2 CORS is vital as these sites are used for many precise scientific and research applications, such as tracking continental movement. The surveys achieve a precision of better than 1 millimetre in position and height and movement of as little as 1-2 millimetres may make the site unsuitable for such applications.

CORS RM surveys must be undertaken to specifications provided by Geoscience Australia, including the equipment used (precise and calibrated), the survey practice followed, and the data processing methods used.

back to top