Variations in capture times in the development of point cloud models with a Terrestrial Laser Scanner due to fieldwork conditions
DOI:
https://doi.org/10.5377/arquitectura.v8i16.17153Keywords:
Estimates, heritage , TLS, technology, laser-scanningAbstract
Laser scanners have a configuration for 3D capture in which, for certain density (low, medium and high) specific times are available. For low densities, the time it may take to capture point clouds with RGB is close to 7 minutes. However, fieldwork capture times do not depend only on the configuration of the equipment, in instead of it is necessary to take into account a series of human factors that intervene in fieldwork, such as (a) following a planning, (b) the time of placement and adjustment of the tripod per station, (c) the placement and adjustment of the targets and (d) the leveling of the station. These factors are random because they are human factors. So, how much can fieldwork capture time vary considering human conditions? The aim of this study was to estimate the approximate capture time by stations during a 3D survey of building campaign with a TLS model Leica ScanStation C10. To estimate the average measurement time, 3 cases of studies were analyzed: Regina 143, Belisario Domínguez School and the ExTeresa Arte Actual Museum Chapel (CMEAA). Means, medians and standard deviations of the captures with low resolutions were estimated for point clouds and for RGB. Results point out that the average capture time per station was 12 minutes 30 seconds, with standard deviations of 4 minutes and 36 seconds. The time it takes the fieldwork crew to do adjustment activities, on average is 2 minutes and 44 seconds. These data will be useful for planning survey projects with similar instruments.
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