Abstract
A coastline is the boundary zone between land and sea, an active zone of human social production activities and an area where the ecology is fragile and easy to change. The traditional method to analyze temporal and spatial changes in the coastline is to extract the coastline through remote sensing, LiDAR, and field sampling and analyze the temporal and spatial changes with statistical data. The coastline extracted by these methods has high spatial and temporal resolution, but it requires remote sensing images and data obtained by other sensors, so it is impossible to extract coastlines from before the emergence of remote sensing technology. This paper improves the coastline generation algorithm. Firstly, a triangulated irregular network is used to generate the preliminary rough coastline, and then, each line segment is optimized with Python language according to the influence range of the place names to further approach the real coastline. The accuracy of the coastline extracted by this method can reach 80% within 500 m, which is of great significance in the mapping and analysis of small- and medium-scale coastlines. This paper analyzes the changes in the coastline of Hainan Island before the founding of China (pre-founding) and in modern times and analyzes the impact of coastal development on coastline change. Through the analysis, it is found that, from before the founding of the People’s Republic of China to the present, the natural coastline of Hainan Island has become shorter, the artificial coastline has become longer, and the coastline generally presents a trend of advancing toward the ocean. This method realizes coastline construction under the condition of missing remote sensing images and puts forward a new way to study historical coastline changes.
Highlights
The coastal zone is a unique natural resource in coastal areas that plays an important role in improving the quality of life in coastal areas and enriching the landscape scenery [1].its ecological environment is fragile and vulnerable to destruction [2,3,4]
The shape and trend of the modern simulated coastline are basically consistent with the trend of the real coastline
This study is different in that that we tried to reconstruct the coastline as much as possible using only the data of place names, because the influence range of each interest point in different regions is different, and the coastline distribution extracted from remote sensing images with different resolutions is somewhat different
Summary
The coastal zone is a unique natural resource in coastal areas that plays an important role in improving the quality of life in coastal areas and enriching the landscape scenery [1]. Its ecological environment is fragile and vulnerable to destruction [2,3,4]. People need to protect the coastal ecology rather than develop it further [5], which has gradually become a key issue [6]. Its elevation is high in the middle and low in the periphery [8]. It is located in the tropics at 108◦ 370 –111◦ 050 E longitude and 18◦ 100 –20◦ 100 N latitude, in the southernmost
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