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Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

From: Spatial accuracy assessment of unmanned aerial vehicle-based structures from motion multi-view stereo photogrammetry for geomorphic observations in initiation zones of debris flows, Ohya landslide, Japan

Fig. 3

Results of the UAV-SfM measurements. a Orthophotograph of the entire observation area and DEMs of the differences (DoD). b Between DEMTLS and DEMSfM. c Between DEMTLS and DEMSfM-ICP. Because both DoDs were computed such that DEMSfM or DEMSfM-ICP was subtracted from DEMTLS, the cold (positive value) and warm (negative value) colors indicate domains where the elevations of DEMSfM or DEMSfM-ICP are relatively high and low compared to DEMTLS, respectively. The TLS measurement focused on the downstream side of the initiation zone; therefore, there are blank domains indicated by the black color on the upstream side. The domain surrounded by the dotted red line indicates the area used for the validation

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