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Accuracy assessment of a topographic mapping method with laser range finder and differential global positioning system: a case study for a rock glacier in the Swiss Alps

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  • Accuracy assessment of a topographic mapping method with laser range finder and differential global positioning system a case study for a rock glacier in the Swiss Alps
  • レーザー距離計とディファレンシャルGPSを用いた地形測量データの精度検証--スイスアルプスの岩石氷河を例に

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Abstract

Combined use of LRF (laser range finder) and DGPS (differential global positioning system) enables quick and cost-effective acquisition of detailed topographic data in field sites (Hayakawa and Tsumura, 2008, Transactions, Japanese Geomorphological Union 29, 421-434). However, the accuracy of the measurement method remains to be clarified especially in relation to the reference data from other source. Here we assess the accuracy of a DEM (digital elevation model) of a rock glacier in the Swiss Alps constructed using LRF and DGPS by comparing with elevation values of RTK-GPS (real-time kinematics GPS) measurement data whose accuracies are known to be sufficiently high. The vertical accuracy of the DEM is numerically evaluated to be 0.8m, and the measurement method is confirmed to be accurate enough for various kinds of geomorphic analyses such as monitoring meterscale changes in surface topography of the rock glacier.

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