Tidal flats in Rudong county, located at the end of Jiandsu Radail Sand Ridges Area. Plentiful quantities of tidal flat makes this area an important land reserve resource. However, traditional field measurement technology encounters difficult due to special form of geomorphology in Rudong tidal flat, resulting the lack of data support in rational exploitation. In order to obtain the extent of tidal flat with volatile coastal evolution, we proposed a modified method, which based on the previous studies, to map tidal flat area with rare manual intervention. Firstly, a confident low tide image generated under the method of pixel-based NDWI average composite. Then, OSTU method was used to compute threshold, which used to segment image into two value. followed by tideline extraction. Subsequently, the extent of tidal flat in Rudong county was obtained. The study shows that the method can realize the extraction of the tidal flat extent in complex landform quickly and accurately. The research data can be obtained free of charge, which makes the method generalized.
Tidal flat area gains abundant natural resources. With the development of the coastal economy, tidal flat area possesses an unstable nature, thus of significant value for its study. Waterline extracting methods are essential to understand the dynamic change of tidal flat. In order to find a good method, we took Rudong County in Jiangsu Province as the research area, by using the HJ1A/1B images, waterlines are generated under the method of visual interpretation extraction, Canny edge detection, threshold segmentation and object-oriented classification. By contrast, the paper considered object-oriented classification as an effective method to extract waterlines.
A tidal flat, the important potential land resource, is the sensitive area of intersection between the sea and the land. With Chinese HJ-1A/B remote sensing images of 2014 as data sources, based on the definition of a tidal flat, using DSAS software and Jenks Natural Breaks classification method synthetically, a more reasonable and accurate method of extracting tidal flat was imposed. In addition, the Bohai Rim was taken as an example to carry out investigation on the current situation of tidal flat. This paper can provide basic date and scientific evidence for rational utilization and sustainable development of tidal flat.
Reclamation caused a significant dynamic change in the coastal zone, the tidal flat zone is an unstable reserve land resource, it has important significance for its research. In order to realize the efficient extraction of the tidal flat area information, this paper takes Rudong County in Jiangsu Province as the research area, using the HJ1A/1B images as the data source, on the basis of previous research experience and literature review, the paper chooses the method of object-oriented classification as a semi-automatic extraction method to generate waterlines. Then waterlines are analyzed by DSAS software to obtain tide points, automatic extraction of outer boundary points are followed under the use of Python to determine the extent of tidal flats in 2014 of Rudong County, the extraction area was 55182hm2, the confusion matrix is used to verify the accuracy and the result shows that the kappa coefficient is 0.945. The method could improve deficiencies of previous studies and its available free nature on the Internet makes a generalization.
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