高分辨率遥感影像海岸线提取方法研究——以WorldView-2数据为例

Study on Coastline Extraction of High Spatial Resolution Images:Take the WorldView-2 Data for Example

针对海岸线人工解译提取的复杂性,研究了高分辨率遥感数据的海岸线自动提取技术。以WorldView-2影像为例,对研究区内的人工、砂质和基岩3种类型海岸水边线分别建立了遥感解译标志,分析不同水边线两侧地物的光谱特性,根据二者的光谱差异构建有效的特征波段,然后利用阈值法实现各类型海岸水边线的自动提取,进而通过进行潮位校正获得海岸线,大大提高了海岸线提取的精度和效率。

Because traditional manual visual interpretation was time and labor consuming, automatic method of coastline extraction u- sing remote sensing data with high spatial resolution was researched. Taking WorldView -2 image as an example, interpreting marks for waterline of artificial, sandy and rocky coast in the experimental area were established. By analyzing the spectral feature between the two sides, special band was built, and threshold method was applied to accomplish the waterline extraction. Besides, tidal correc- tion was used to obtain the coastline accurately. Results showed that, the proposed method proposed performed well on both precision and efficiency.