Abstract
The paper presents the quantitative methodology for visual impact assessment of river regulation structures such as non-submerged groins and longitudinal dams. The method integrates LIDAR data, GIS tools, 3D graphic software and 360° panoramic images. Digital Surface Model (DSM) developed on the basis of LIDAR data and imported to 3D graphic software allows one to render images from any location of 3D scene. This feature was used for rendering 360° panoramic images from the perspective of the observers located on the study site in designated with the viewshed analysis area. Renders were verified against panoramic photographs taken during the field inspection. The proposed methodology was tested on two locations of Kostrzyn nad Odrą and Słubice cities where modernization of regulation structures on Oder River is planned. Calculated percentage values of river regulation structures occupying the full field of view of the observer for 25 locations in Kostrzyn nad Odrą and 19 locations in Słubice shows insignificant visual impact. The maximum values of 0.94% and 0.26% for Kostrzyn nad Odrą and Słubice respectively, where obtained. Additionally the visualization method in the form of “Little Planet” projections was presented, which allows for full documentation of the visual impact of the structures on the landscape.
Highlights
Since the beginning of the 21st century, scientific research has been conducted on the development of quantitative methods for assessing the impact of investments on landscape
The second approach to visual impact assessment often used in studies is the analysis of photographs implemented with analysed objects which simulates the perspective from the human-eye instead of 2D maps [9,10]
The visual impact assessment of river regulation structures on the Oder River was carried out on two river sections located in Słubice and Kostrzyn nad Odrą cities, where modernization of the non-submerged groins and longitudinal dams is planned (Fig. 3)
Summary
Since the beginning of the 21st century, scientific research has been conducted on the development of quantitative methods for assessing the impact of investments on landscape. Viewshed tools are based on an analysis of obstacles between the observer and analysed object. The viewshed analysis gives binary results, determining the areas from where the analysed object is visible. The second approach to visual impact assessment often used in studies is the analysis of photographs implemented with analysed objects which simulates the perspective from the human-eye instead of 2D maps [9,10]. This approach gives more human-friendly results but is difficult to apply on large scale. The aim of this study was to develop method for quantitative visual impact assessment of river regulation structures and perform analysis on the reach of Oder River where the modernization of structures are planned
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