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Modern digital cameras are increasing in quality whilst decreasing in size. In the last decade, a number of waterproof consumer\uddigital cameras (action cameras) have become available, which often cost less than $500. A possible application of such action\udcameras is in the field of Underwater Photogrammetry. Especially with respect to the fact that with the change of the medium to\udbelow water can in turn counteract the distortions present. The goal of this paper is to investigate the suitability of such action\udcameras for underwater photogrammetric applications focusing on the stability of the camera and the accuracy of the derived\udcoordinates for possible photogrammetric applications. For this paper a series of image sequences was capture in a water tank. A\udcalibration frame was placed in the water tank allowing the calibration of the camera and the validation of the measurements using\udcheck points. The accuracy assessment covered three test sets operating three GoPro sports cameras of the same model (Hero 3\udblack). The test set included the handling of the camera in a controlled manner where the camera was only dunked into the water\udtank using 7MP and 12MP resolution and a rough handling where the camera was shaken as well as being removed from the\udwaterproof case using 12MP resolution. The tests showed that the camera stability was given with a maximum standard deviation of\udthe camera constant σc of 0.0031mm for 7MB (for an average c of 2.720mm) and 0.0072 mm for 12MB (for an average c of\ud3.642mm). The residual test of the check points gave for the 7MB test series the largest rms value with only 0.450mm and the largest\udmaximal residual of only 2.5 mm. For the 12MB test series the maximum rms value is 0. 653mm

ACCURACY ASSESSMENT OF GO PRO HERO 3 (BLACK) CAMERA IN UNDERWATER ENVIRONMENT