Abstract
Coastal environments are facing constant changes over time due to their dynamic nature and geological, geomorphological, hydrodynamic, biological, climatic and anthropogenic factors. For these reasons, the monitoring of these areas is crucial for the safeguarding of the cultural heritage and the populations living there. The focus of this paper is shoreline extraction by means of an experimental algorithm, called J-Net Dynamic (Semeion Research Center of Sciences of Communication, Rome, Italy). It was tested on two types of image: a very high resolution (VHR) multispectral image (WorldView-2) and a high resolution (HR) radar synthetic aperture radar (SAR) image (Sentinel-1). The extracted shorelines were compared with those manually digitized for both images independently. The results obtained with the J-Net Dynamic algorithm were also compared with common algorithms, widely used in the literature, including the WorldView water index and the Canny edge detector. The results show that the experimental algorithm is more effective than the others, as it improves shoreline extraction accuracy both in the optical and SAR images.
Highlights
The coastal environment is an extraordinary natural resource, from the point of view of the cultural heritage but for hosting resources that can be measured in terms of economic assets
The three instantaneous shorelines extracted using the Sentinel-1 image are shown in Figure 7: the red one is the shoreline extracted manually, the yellow one is from the Canny algorithm and the blue one is from the J-Net Dynamic algorithm
It has been tested both in multispectral and in synthetic aperture radar (SAR) images with different resolutions. Both images were pre-processed to improve their geometric and radiometric properties in order to facilitate their subsequent analysis. They were processed with filters and indices commonly used for this kind of research, like the WorldView water index for the optical image and the Canny edge detector for the radar image, and the J-Net Dynamic
Summary
The coastal environment is an extraordinary natural resource, from the point of view of the cultural heritage but for hosting resources that can be measured in terms of economic assets. It is a dynamic environment, subject to continuous and constant transformation. The coastal environment, where large percentages of the global population live, change rapidly due to its dynamic nature. For this reason, the availability of up-to-date information on its state is of great interest
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