LRFとDGPSを用いた野外調査における地形測量 : トルコ,ハジトゥール・テペ遺跡における適用事例

概要

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A topographic dataset, including topographic map and digital elevation model (DEM), is fundamental for various kinds of field-based sciences including geomorphology, geology and archaeology. However, to make a detailed topographic map by traditional or high-tech methods is often expensive and time-consuming. A method of quick, on-site acquisition of topographic data using a handheld laser range finder (LRF) has been previously proposed, but its uncertainties sometimes exceed several to tens of meters. Here we develop a method to obtain detailed topographic data using not only LRF but also differential global positioning system (DGPS) with sub-meter accuracies. This method is practical and appropriate for detailed field surveys, and does not require much time, financial cost and many operating persons to complete the measurement procedure, compared to traditional or high-tech methods. Our survey in an archaeological mound, the Hacitugrul Tepe in Turkey, revealed that the accuracy of the topographic data obtained by the method is ca. 10^<-1>-10^0m, and that such detailed topographic data in small to wide areas (ca. 10^2-10^9m^2) can be obtained within a few hours to days. The obtained digital dataset also enables quantitative spatial analyses of topography in the site.
2008-10-25