Monitoring coastal land use changes using digital photogrammetry : case study of Black Sea Coast of Trabzon, Turkey
Sesli, Faik Ahmet ... [et al.]
The coasts, named as the natural sources, remaining untouched by human being for centuries brought up new ways of usage first by providing profil in terms of sea products and transportation, parallel to the development in social life forms and then by the increase in population and technological improvements. Photogrammetry has the advantages of acquiring information about a large area very efficiently and cost effectively. This paper introduces an efficient method to monitor environmental changes using a different approach for images taken from the same geographical location but at different times. If only available in an analog form, images need to be scanned before proceeding. After the completion of orientation process, the differences between consecutive data sets displayed in one picture immediately reveal environmental changes that happened in the time between, regarding e.g. urban development, roads, forests or coast lines. The described approach was verified by a test data set from Trabzon, in the east part of the Turkish Black Sea coast. Results gained so far are precise and clear enough to confirm the introduced method, and indicate that digital photogrammetry is an effective approach for monitoring coastal land use status of large area. In this study, the aerial photographs were obtained in two different times. By examining the photographs, it is apparent that coastal zone of the study area has been changed drastically in the course of time. The digital photogrammetric approach utilizes digital images to do all the measuring and digitising works. In this respect, high-quality digital images are required for use in digital photogrammetric processing. Besides, the processes of duplicating film and scanning positives should be done required geometric resolution with extra caution. This study shows that photogrammetry is very suitable for acquiring information about changes in a coastal area, particularly when cost, effectiveness, efficiency, and accuracy are all considered.
Event: XXIII International FIG Congress : Shaping the change
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