Blick, G.H. 1991 Triangulation data from the central North Island to be compared with Global Positioning System (GPS) measurements. Lower Hutt: DSIR Geology & Geophysics. New Zealand Geological Survey report EDS 134 25 p.
Abstract: Two major triangulation surveys have been made by the Department of Survey and Land Information since the 1920s and will be compared with modern GPS observations as part of a project to measure deformation across the Taupo Volcanic Zone and North Island shear belt. The surveys are the 1st order triangulation of the North Island, made during the 1920s and 30s, and a 2nd and 3rd order control survey completed in the Bay of Plenty/Taupo region during the 1950s. The precision of the directional data has been estimated at 0.7'' for the 1st order data and 1.2'' for the 2nd and 3rd order data. One observation was rejected from the 2nd and 3rd order data set. Fifteen existing 1st order trig stations were reoccupied during the later survey which provides the opportunity to compare the two data sets. Any apparent change between them is not well described by a uniform strain model. (auths)
