Ground probing radar and photogrammetric measurements at a Maori archaeological site

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White, P.A.; Broadbent, M. 1994 Ground probing radar and photogrammetric measurements at a Maori archaeological site. Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 94/02 iii, 45 p.

Abstract: Ground probing radar measurements have been made within the Kaiapohia Pa arcaeological site where magnetic and resistivity measurements have previously been made. Radar measurements were made in two 22 metres2 areas at 0.2 m intervals along lines spaced 0.5 m apart. The radar equipment malfunctioned. However, an examination of the data collected and observed correlations of radar data with magnetic and resistivity data suggest that radar responses are detectable from features of archaeological interest. Results suggest that future radar surveys at this archaeological site should involve making measurements at 2 to 3 cm intervals along lines using radar employing 300 to 500 MHz antannae. The photogrammetric technique was used to obtain a digital terrain model of position and elevation for nearly twelve thousand points. Contour plots of these data identified features of the site such as streams and embankment walls. Some features of the area within the embankment walls, possibly related to the internal construction of the pa, have been identified by relief shading and false sun imaging of the digital terrain model. These features are not observed under natural light conditions. (auth)