Reference gravity stations

A catalogue of reference gravity stations in New Zealand has been assembled from measurements made since the 1950s using mostly Lacoste and Romberg D- and G-model meters. These data are from the New Zealand Primary Gravity Network and GNS Science gravity stations for measuring secular changes in gravity. In 2004 the observation data were uniformly processed using GNS Science software and tied to gravity base stations in Auckland and Dunedin. The 2004 revised gravity values currently provide the best spatial coverage of reference gravity for New Zealand. Regular updates of the database are available in kml file format including absolute gravity observations, and links to site diagrams and the LINZ benchmark maintenance pages. These stations can be used to tie any gravity survey using a differential gravity meter.