2017 Volume 23 Pages 191-196
An orientation measurement method that uses auxiliary recording instruments was developed to enhance applicability and operating efficiency of the image-based non-contact river flow measurement methods such as the Large Scale Particle Image Velocimetry (LSPIV) and the Spatio-Temporal Image Velocimetry (STIV). With this method, field observations can be carried out without the reference marks at the time of observation, consequently saving the efforts of orientation measurement. However, the influence of the angle measurement error on the accuracy of the converted image and the applicable range were not sufficiently studied in the previous research. Therefore, verification was carried out with the objective of presenting proposals focusing on practical aspects such as precision characteristics of the method, practical application range, concept of accuracy management.
