GLOW-S River Width dataset
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Introduction: The GLOW-S dataset provides a comprehensive record of global river widths, captured with high-resolution Sentinel-2 imagery. This dataset focuses on delivering an enhanced spatial and temporal analysis of river widths, suitable for diverse hydrological and environmental studies. Data Collection and Processing: Image Source: River width data were extracted from Sentinel-2 satellite imagery accessed via Google Earth Engine, utilizing higher resolution capabilities than previous datasets based on Landsat. Extraction Methodology: Following validated methods from prior research (Feng et al., 2019; 2022), the dataset involves: Identification of rivers observable in Sentinel-2 images. Construction of cross-sections for width extraction. Application of quality filters on images to ensure accuracy in width measurements. Determination of water extent and subsequent river width calculation at each cross-section for images spanning 2017 to 2022. Dataset Features: Temporal Coverage: Data spans from 2017 to 2022, capturing seasonal and interannual variations in river width. Spatial Resolution: Utilizes the superior spatial resolution of 10m from Sentinel-2 for detailed river width analysis. Postprocessing: When multiple observations for the same cross-section and date exist, the dataset averages these widths to enhance usability. Column names: riverID (cross section identifier): R<COMID>XS<Section ID> date (image capture date): YYYY-MM-DD width (river width captured in meters) Additional data: The shapefiles of cross sections are also attached alongside.
数据集介绍：GLOW-S数据集提供了全球河道宽度的完整记录，数据基于高分辨率哨兵二号（Sentinel-2）卫星影像获取。本数据集旨在优化河道宽度的时空分析能力，可适配各类水文与环境研究需求。 数据采集与处理流程： 影像来源：河道宽度数据提取自通过谷歌地球引擎（Google Earth Engine）获取的Sentinel-2卫星影像，相较于此前基于Landsat（陆地卫星）的数据集，本数据集拥有更优异的空间分辨率。 提取方法：沿用已验证的前人研究方法（Feng等，2019；2022），数据集构建流程如下：识别Sentinel-2影像中的可观测河道；构建用于提取宽度的河道横断面；对影像施加质量过滤以保障宽度测量的准确性；针对2017至2022年的影像，确定水体覆盖范围并计算各横断面处的河道宽度。 数据集特性： 时间覆盖范围：数据时段为2017年至2022年，可捕捉河道宽度的季节变化与年际波动。 空间分辨率：采用哨兵二号（Sentinel-2）10米的高空间分辨率，支持精细化的河道宽度分析。 后处理：当同一横断面与日期存在多组观测值时，数据集将对这些宽度值取平均以提升可用性。 字段说明： riverID（河道横断面标识符）：格式为R<COMID>XS<断面编号> date（影像捕获日期）：格式为YYYY-MM-DD width（河道宽度，单位：米） 附加数据：同步提供了河道横断面的形状文件（shapefiles）。
