Abstract
Abstract. At present, digital documentation recorded in the form of raster or vector files is the obligatory way of inventorying historical objects. The orthoimage is a cartometric form of photographic presentation of information in the two-dimensional reference system. The paper will discuss the issue of automation of the orthoimage generation basing on the TLS data and digital images. At present attempts are made to apply modern technologies not only for the needs of surveys, but also during the data processing. This paper will present attempts aiming at utilisation of appropriate algorithms and the author’s application for automatic generation of the projection plane, for the needs of acquisition of intensity orthoimages from the TLS data. Such planes are defined manually in the majority of popular TLS data processing applications. A separate issue related to the RGB image generation is the orientation of digital images in relation to scans. It is important, in particular in such cases when scans and photographs are not taken simultaneously. This paper will present experiments concerning the utilisation of the SIFT algorithm for automatic matching of intensity orthoimages of the intensity and digital (RGB) photographs. Satisfactory results of the process of automation, as well as in relation to the quality of resulting orthoimages have been obtained.
Highlights
Within the community of architects a tendency may be observed aiming at substituting the conventional vector drawing with raster products
Combination of the point clouds obtained from the laser scanner and digital images seems to be more useful for the purposes of orthoimage generation
Performed experiments proved that the process of generation of orthoimages may be automated, from generation of a reference plane to automatic generation of RGB orthoimages
Summary
Within the community of architects a tendency may be observed aiming at substituting the conventional vector drawing with raster products. In the process of generation of the orthoimages it is important to determined two basic issues: the accuracy and resolution of data. The resolution should be considered as the possibility to discriminate details It is defined by means of the (object) field pixel size of the resulting orthoimage. The accurate modelling of the surface is the key issue in the process of the orthoimage generation. It directly influences their quality, both, in relation their geometry and their visual correctness. Combination of the point clouds obtained from the laser scanner (as the digital object surface model) and digital images seems to be more useful for the purposes of orthoimage generation. The automation of data processing during generation of photogrammetric products is not a separate issue
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