Remote Sensing for Natural Resources >
A precise coastline extraction method using surface moisture content and long-time-series remote sensing imagery
Received date: 2024-06-12
Revised date: 2024-08-04
Online published: 2026-06-03
Coastlines serve as one of the most essential basic geographic elements. However,conventional methods generally face challenges in the accurate detection of their location,due to instantaneous remote sensing imaging and dynamic tidal phenomena. In response to this,this study developed a novel coastline extraction model that incorporates information on surface moisture content derived from long-time-series satellite remote sensing imagery. First,all available remote sensing images covering the study area during the target period were acquired to construct a high-quality remote sensing image stack. Second,the wetness components indicative of the surface moisture content were obtained using the tasseled cap transformation (TCT),from which a wetness index stack was constructed. Then,the wetness components were subjected to maximum value synthesis using the maximum spectral index composite (MSIC) algorithm,generating a maximum water surface composite image. Finally,the composite image was segmented using the OTSU algorithm to extract accurate coastline information. Validation experiments were conducted on Zhoushan Island using the Google Earth Engine (GEE) cloud computing platform and remote sensing imagery from the operational land imager (OLI) onboard the Landsat 8 satellite. The results indicate that the proposed model can precisely locate different types of coastlines with high spatial accuracy. Compared to visual interpretation,the model exhibited a mean deviation and a root mean square error (RMSE) of 3.42 m and 6.79 m,respectively,with 99.42% of validation points falling within one pixel width. This study provides an effective technical framework for high-accuracy coastline extraction,holding great significance for scientific management and sustainable development of coastal resources.
GONG Shaojun , CHEN Chao , FAN Jing . A precise coastline extraction method using surface moisture content and long-time-series remote sensing imagery[J]. Remote Sensing for Natural Resources, 2025 , 37(5) : 53 -61 . DOI: 10.6046/zrzyyg.2024198
表1 所用遥感影像及潮汐信息表Tab.1 Remote sensing images and tidal information |
| 序号 | 成像日期 | 行 | 列 | 云量/% | 潮汐信息(北京时间) | 序号 | 成像日期 | 行 | 列 | 云量/% | 潮汐信息(北京时间) | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 验潮站 | 高潮时刻 | 低潮时刻 | 验潮站 | 高潮时刻 | 低潮时刻 | |||||||||||
| 1 | 2022-01-03 | 117 | 39 | 1.05 | 沈家门 | 09:56 | 03:26 | 9 | 2022-03-24 | 117 | 40 | 13.50 | 岱山 | 13:54 | 08:54 | |
| 2 | 2022-01-03 | 117 | 40 | 3.25 | 沈家门 | 09:56 | 03:26 | 10 | 2022-04-09 | 117 | 40 | 8.55 | 岱山 | 15:04 | 10:17 | |
| 3 | 2022-01-19 | 117 | 40 | 0.35 | 沈家门 | 10:40 | 04:20 | 11 | 2022-05-02 | 118 | 39 | 11.24 | 岱山 | 11:12 | 05:46 | |
| 4 | 2022-02-27 | 118 | 39 | 0.08 | 沈家门 | 07:03 | 14:43 | 12 | 2022-08-22 | 118 | 39 | 9.55 | 岱山 | 06:28 | 12:32 | |
| 5 | 2022-03-08 | 117 | 39 | 0.05 | 沈家门 | 06:40 | 12:17 | 13 | 2022-10-02 | 117 | 39 | 2.63 | 岱山 | 14:52 | 08:16 | |
| 6 | 2022-03-08 | 117 | 40 | 0.07 | 沈家门 | 06:40 | 12:17 | 14 | 2022-10-02 | 117 | 40 | 3.88 | 岱山 | 14:52 | 08:16 | |
| 7 | 2022-03-15 | 118 | 39 | 0.15 | 沈家门 | 08:11 | 14:50 | 15 | 2022-11-10 | 118 | 39 | 11.81 | 岱山 | 11:30 | 05:21 | |
| 8 | 2022-03-24 | 117 | 39 | 0.03 | 沈家门 | 12:42 | 07:24 | 16 | 2022-11-26 | 118 | 39 | 6.21 | 岱山 | 12:08 | 05:44 | |
表2 Landsat8卫星反射率的缨帽变换系数Tab.2 Tasseled cap transformation coefficients for Landsat8 satellite reflectance |
| 缨帽变换后分量 | 波段 | |||||
|---|---|---|---|---|---|---|
| 蓝光 | 绿光 | 红光 | 近红外 | 短波红外1 | 短波红外2 | |
| 亮度指数 | -0.236 3 | -0.283 6 | -0.425 7 | 0.809 7 | 0.004 3 | -0.164 0 |
| 绿度指数 | 0.130 1 | 0.229 0 | 0.349 2 | 0.179 5 | -0.627 0 | -0.620 0 |
| 湿度指数 | -0.823 9 | 0.084 9 | 0.439 6 | -0.058 0 | 0.201 3 | -0.277 0 |
| TCT4 | -0.329 4 | 0.055 7 | 0.105 6 | 0.185 5 | -0.434 9 | 0.808 5 |
| TCT5 | 0.107 9 | -0.902 3 | 0.411 9 | 0.057 5 | -0.025 9 | 0.025 2 |
| TCT6 | 0.344 3 | 0.405 7 | 0.466 7 | 0.534 7 | 0.393 0 | 0.241 2 |
表3 海岸线长度及所围面积比较Tab.3 Comparisons in area and length of the coastline |
| 方法 | 面积/km2 | 长度/km | 面积误差/% | 长度误差/% |
|---|---|---|---|---|
| 目视解译 | 514.43 | 146.84 | — | — |
| 本文方法 | 513.68 | 150.51 | -0.14 | 2.50 |
| NDWI法 | 516.19 | 152.40 | 0.34 | 3.79 |
| MNDWI法 | 516.18 | 152.76 | 0.34 | 4.04 |
表4 距离平均值和RMSETab.4 Average and root mean square error |
| 方法 | 选取点数/个 | 距离平均值/m | RMSE/m |
|---|---|---|---|
| 本文方法 | 1 200 | 3.42 | 6.79 |
| NDWI法 | 1 200 | 18.40 | 30.50 |
| MNDWI法 | 1 200 | 18.03 | 30.12 |
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