Global River Ice Dataset
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This dataset is public for a manuscript under review. The dataset consists of one csv file containing estimated river ice (length) fraction based on images from USGS Landsat satellite missions. Documentation for the Global River Ice Dataset This csv file contains 840,187 records (rows) of river ice length fraction derived from Landsat satellite images. For each river ice fraction, we have the following associated properties: 1. date: The date on which the image was captured (format: YYYY-MM-DD; data type: string) 2. river_ice_fraction: The length fraction of ice cover (format: decimal number; data type: float; range: [0, 1]) 3. cloud_fraction: The length fraction of cloud cover (format: decimal number; data type: float; range: [0, 1]) 4. topo_shadow: Average topographic shadow along river centerline (format: decimal number; data type: float; range: [0, 1] with 0 meaning fully in shadow) 5. LANDSAT_SCENE_ID: The unique Landsat TOA image identifier (data type: string) 6. PATH: The path of the Landsat image (under WRS-2), roughly related to the longitudinal position of the image (data type: integer) 7. ROW: The row of the Landsat image (under WRS-2), roughly related to the latitudinal position of the image (data type: integer) 8. N_river_pixel: Number of total centerline points intersecting with the Landsat image (data type: integer) 9. N_clear_river_pixel: Number of centerline points free from cloud or cloud shadow cover that intersected with the Landsat image (data type: integer) The dataset used for analysis is a subset (No. of records: 407,542) of this dataset with implementing the following three constraints: \(N\_clear\_river\_pixel ≥ 333\) \(topo\_shadow ≥ 0.95\) \(cloud\_fraction ≤0.25\)
本数据集面向一篇处于审稿阶段的学术手稿公开。该数据集包含一份CSV文件，其中存储了基于美国地质调查局（United States Geological Survey, USGS）Landsat系列卫星影像反演得到的河道冰盖长度占比估算数据。 全球河道冰数据集说明：此CSV文件共计840187条记录（行），记录了由Landsat卫星影像提取得到的河道冰盖长度占比数据。针对每条冰盖占比数据，其关联以下属性： 1. date：影像拍摄日期（格式：YYYY-MM-DD；数据类型：字符串） 2. river_ice_fraction：冰盖长度占比（格式：十进制小数；数据类型：浮点型；取值范围：[0, 1]） 3. cloud_fraction：云盖长度占比（格式：十进制小数；数据类型：浮点型；取值范围：[0, 1]） 4. topo_shadow：河道中心线沿线平均地形阴影占比（格式：十进制小数；数据类型：浮点型；取值范围：[0, 1]，0代表完全处于阴影中） 5. LANDSAT_SCENE_ID：Landsat顶层大气（Top of Atmosphere, TOA）影像唯一标识符（数据类型：字符串） 6. PATH：Landsat影像的条带号（遵循WRS-2编目规则），大致对应影像的纵向位置（数据类型：整型） 7. ROW：Landsat影像的行号（遵循WRS-2编目规则），大致对应影像的纬度位置（数据类型：整型） 8. N_river_pixel：与该Landsat影像相交的河道中心线总点数（数据类型：整型） 9. N_clear_river_pixel：与该Landsat影像相交且未受云或云阴影覆盖的河道中心线点数（数据类型：整型） 本次分析所用数据集为原数据集的子集（记录数：407542条），筛选时遵循以下三项约束条件： 1. N_clear_river_pixel ≥ 333 2. topo_shadow ≥ 0.95 3. cloud_fraction ≤ 0.25
