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The demand for capturing indoor spaces is rising with the digitalization trend in the construction industry. An efficient solution for\udmeasuring challenging indoor environments is mobile mapping. Image-based systems with 360° panoramic coverage allow a rapid\uddata acquisition and can be processed to georeferenced 3D images hosted in cloud-based 3D geoinformation services. For the multiview\udstereo camera system presented in this paper, a 360° coverage is achieved with a layout consisting of five horizontal stereo\udimage pairs in a circular arrangement. The design is implemented as a low-cost solution based on a 3D printed camera rig and action\udcameras with fisheye lenses. The fisheye stereo system is successfully calibrated with accuracies sufficient for the applied\udmeasurement task. A comparison of 3D distances with reference data delivers maximal deviations of 3 cm on typical distances in\udindoor space of 2-8 m. Also the automatic computation of coloured point clouds from the stereo pairs is demonstrated

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

DESIGN AND IMPLEMENTATION OF A NOVEL PORTABLE 360° STEREO CAMERA SYSTEM WITH LOW-COST ACTION CAMERAS