Abstract
The application of terrestrial laser scanning incomplex archaeologicalsites is an increasingly common fact in the last years. This equipment allows a quick and massive digitalization of the scanned surface, what reverts to achieve very detailed time series of the study area in a low-cost way. The main problem for this labour is to have the expertise to stablish the minimum number of scanning stations and their optimal location. If the archaeological site is really complex, the in situ decisions about the number and positions of scans can be very difficult only suitable for experts in laser scanning. Trying to provide a useful tool for archaeologists, this paper presents a methodology for planning and optimizing the scans locations taking advance of existing cartographic products. As a result, the archaeologist can plan the scanning surveying, improving and optimizing the scan positions from the office. This approach was validated over the complex archaeological site of El Tolmo de Minateda located in Albacete (Spain).
Highlights
The widespread use of terrestrial laser scanners (TLSs) denotes its potential in several fields of application
A methodology supported by QGIS [20] has been developed in which the design of this network is optimized iteratively based on the digital surface model (DSM)
This DSM was generated as a result of a photogrammetric flight executed with a light aircraft and a digital camera
Summary
The widespread use of terrestrial laser scanners (TLSs) denotes its potential in several fields of application. A methodology supported by QGIS [20] has been developed in which the design of this network is optimized iteratively based on the digital surface model (DSM) This DSM was generated as a result of a photogrammetric flight executed with a light aircraft (a paratrike) and a digital camera. QGIS VisibilityAnalysis plugin [30] calculates visible surfaces from a given observer point over a DSM For this calculation, it is necessary to provide the digital terrain or surface model, the layer of the points from which each scan is intended (an initial approximation), the maximum scanning range and the height of the optical center of the TLS.The plugin generates the overlap maps from the established group of points by performing an analysis of their visibility based on the principle of projective geometry [30]. It was considered that given the extension and complexity of the area, without this previous planning design, the fieldwork could have been delayed as well as the model could have had insufficient coverage in some areas
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