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Terrestrial Laser Scanning (TLS) is an established method to reconstruct the geometrical surface of given objects. Current systems\udallow for fast and efficient determination of 3D models with high accuracy and richness in detail. Alternatively, 3D reconstruction\udservices are using images to reconstruct the surface of an object. While the instrumental expenses for laser scanning systems are\udhigh, upcoming free software services as well as open source software packages enable the generation of 3D models using digital\udconsumer cameras. In addition, processing TLS data still requires an experienced user while recent web-services operate completely\udautomatically. An indisputable advantage of image based 3D modeling is its implicit capability for model texturing. However, the\udachievable accuracy and resolution of the 3D models is lower than those of laser scanning data. Within this contribution, we\udinvestigate the results of automated web-services for image based 3D model generation with respect to a TLS reference model. For\udthis, a copper sculpture was acquired using a laser scanner and using image series of different digital cameras. Two different webservices,\udnamely Arc3D and AutoDesk 123D Catch were used to process the image data. The geometric accuracy was compared for\udthe entire model and for some highly structured details. The results are presented and interpreted based on difference models.\udFinally, an economical comparison of the generation of the models is given considering the interactive and processing time costs

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

COMPARISON OF 3D RECONSTRUCTION SERVICES AND TERRESTRIAL LASER SCANNING FOR CULTURAL HERITAGE DOCUMENTATION