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Table 1 Properties of TLS-derived point clouds for each measurement

From: Seismic and inter-seismic ground surface deformations of the Murono mud volcano (central Japan): a laser scanning approach

Measurement occasion 1 2 3 4
Year 2011 2013 2014 2015
Date Jun. 23 Dec. 5 Dec. 4 Nov. 27
Terrestrial laser scanner used GLS-1500 TX5 TX5 TX5
Number of scan position 4 8 7 10
Weather conditions Cloudy Sunny Rainy Rainy to cloudy
Internal registration error (mm) 4.0 2.9 7.9 9.8
Horizontal GCP error (mm) 12.1 11.7
Vertical GCP error (mm) 23.1 17.3
Number of GCPs 11 3
External registration errors (mm) 6.2 15.7 19.8
Total number of measured points 1,973,134 130,137,112 102,864,460 47,933,335
Number of points used 1,082,832 52,158,136 69,169,926 30,018,333
Coverage area (excluding no data cells) (m2) 1854 2187 1931 2122
Point density (pt/m2) 583.9 23,845.2 35,814.1 14,143.6
Average point spacing (mm) 41.4 6.5 5.3 8.4