HydroBASINS代表了一系列矢量多边形图层，在全球范围内描述了子流域的边界。该产品的目标是在全球范围内无缝覆盖不同尺度（从几十平方公里到几百万平方公里）的大小一致、分层嵌套的子流域，并由一个编码方案支持，以便对流域拓扑结构进行分析，如上下游连接。HydroBASINS是从网格化的HydroSHEDS核心层中提取的，分辨率为15弧秒。任何子流域划分的一个重要特征是子流域的细分，即决定何时和如何将一个较大的流域细分为多个支流流域。在最高级别的子流域划分中，HydroBASINS将一个流域划分为两个子流域，即在两个河流分支相遇的地方，每个分支的上游面积至少为100平方公里。子流域划分的第二个关键特征是子流域的分组或编码方式，以允许在不同尺度上创建嵌套的子流域，或在子流域网络中从上游到下游进行导航。为了支持这些功能和拓扑概念，"Pfafstetter "编码系统已经在HydroBASINS产品中实施，在全球范围内提供12个分层嵌套的子流域细分。
在最高级别的子流域细分中，HydroBASINS包含了100万个独立的子流域多边形，平均面积为130.6平方公里，代表了全球陆地面积的1.35亿平方公里（不包括南极洲）。HydroBASINS只包括有限的（主要是几何）属性信息，如子流域面积、与上游源头和海洋出口的距离，以及Pfafstetter编码。
请注意，总体的HydroATLAS数据库完全包含了HydroBASINS的所有子流域多边形，这些多边形在HydroATLAS中还被增强了大量的水文环境特征。
文章的技术文档：https://data.hydrosheds.org/file/technical-documentation/HydroBASINS_TechDoc_v1c.pdf
数据影像参考：
Lehner, B., Grill G. (2013). Global river hydrography and network routing: baseline data and new approaches to study the world’s large river systems. Hydrological Processes, 27(15): 2171–2186. https://doi.org/10.1002/hyp.9740
数据下载链接：
HydroBASINS有两种格式。标准 "和 "定制（含湖泊）"。下表提供了每个大陆的HydroBASINS层的访问，在一个压缩文件中提供了该大陆的所有级别（1-12）的数据。
| Data type | Region | Link |
|---|---|---|
| Standard | Africa | Download |
| Standard | Arctic | Download |
| Standard | Asia | Download |
| Standard | Australia | Download |
| Standard | Europe | Download |
| Standard | Greenland | Download |
| Standard | North America | Download |
| Standard | South America | Download |
| Standard | Siberia | Download |
| Customized (with lakes) | Africa | Download |
| Customized (with lakes) | Arctic | Download |
| Customized (with lakes) | Asia | Download |
| Customized (with lakes) | Australia | Download |
| Customized (with lakes) | Europe | Download |
| Customized (with lakes) | Greenland | Download |
| Customized (with lakes) | North America | Download |
| Customized (with lakes) | South America | Download |
| Customized (with lakes) | Siberia | Download |
上面这个表格提供的每个大洲的数据，所以量比较大，如果大家想要下载单个 洲际的可以选择下面的分类子目。
- Africa
- Africa Level 00 - Standard (120MB)
- Africa Level 01-06 - Standard (39MB)
- Africa Level 01-12 - Standard (549MB)
- Africa Level 01 - Standard (1MB)
- Africa Level 02 - Standard (2MB)
- Africa Level 03 - Standard (3MB)
- Africa Level 04 - Standard (6MB)
- Africa Level 05 - Standard (11MB)
- Africa Level 06 - Standard (18MB)
- Africa Level 07 - Standard (30MB)
- Africa Level 08 - Standard (51MB)
- Africa Level 09 - Standard (81MB)
- Africa Level 10 - Standard (113MB)
- Africa Level 11 - Standard (119MB)
- Africa Level 12 - Standard (119MB)
- Arctic (northern Canada)
- Arctic (northern Canada) Level 00 - Standard (29MB)
- Arctic (northern Canada) Level 01-06 - Standard (19MB)
- Arctic (northern Canada) Level 01-12 - Standard (144MB)
- Arctic (northern Canada) Level 01 - Standard (2MB)
- Arctic (northern Canada) Level 02 - Standard (2MB)
- Arctic (northern Canada) Level 03 - Standard (2MB)
- Arctic (northern Canada) Level 04 - Standard (3MB)
- Arctic (northern Canada) Level 05 - Standard (4MB)
- Arctic (northern Canada) Level 06 - Standard (6MB)
- Arctic (northern Canada) Level 07 - Standard (9MB)
- Arctic (northern Canada) Level 08 - Standard (13MB)
- Arctic (northern Canada) Level 09 - Standard (20MB)
- Arctic (northern Canada) Level 10 - Standard (27MB)
- Arctic (northern Canada) Level 11 - Standard (29MB)
- Arctic (northern Canada) Level 12 - Standard (29MB)
- Asia
- Asia Level 00 - Standard (81MB)
- Asia Level 01-06 - Standard (32MB)
- Asia Level 01-12 - Standard (376MB)
- Asia Level 01 - Standard (2MB)
- Asia Level 02 - Standard (2MB)
- Asia Level 03 - Standard (3MB)
- Asia Level 04 - Standard (5MB)
- Asia Level 05 - Standard (8MB)
- Asia Level 06 - Standard (13MB)
- Asia Level 07 - Standard (21MB)
- Asia Level 08 - Standard (34MB)
- Asia Level 09 - Standard (54MB)
- Asia Level 10 - Standard (76MB)
- Asia Level 11 - Standard (80MB)
- Asia Level 12 - Standard (80MB)
- Australasia
- Australasia Level 00 - Standard (40MB)
- Australasia Level 01-06 - Standard (24MB)
- Australasia Level 01-12 - Standard (195MB)
- Australasia Level 01 - Standard (3MB)
- Australasia Level 02 - Standard (3MB)
- Australasia Level 03 - Standard (3MB)
- Australasia Level 04 - Standard (4MB)
- Australasia Level 05 - Standard (5MB)
- Australasia Level 06 - Standard (8MB)
- Australasia Level 07 - Standard (12MB)
- Australasia Level 08 - Standard (18MB)
- Australasia Level 09 - Standard (27MB)
- Australasia Level 10 - Standard (37MB)
- Australasia Level 11 - Standard (39MB)
- Australasia Level 12 - Standard (39MB)
- Europe and Middle East
- Europe and Middle East Level 00 - Standard (75MB)
- Europe and Middle East Level 01-06 - Standard (39MB)
- Europe and Middle East Level 01-12 - Standard (361MB)
- Europe and Middle East Level 01 - Standard (3MB)
- Europe and Middle East Level 02 - Standard (4MB)
- Europe and Middle East Level 03 - Standard (4MB)
- Europe and Middle East Level 04 - Standard (7MB)
- Europe and Middle East Level 05 - Standard (9MB)
- Europe and Middle East Level 06 - Standard (13MB)
- Europe and Middle East Level 07 - Standard (21MB)
- Europe and Middle East Level 08 - Standard (33MB)
- Europe and Middle East Level 09 - Standard (51MB)
- Europe and Middle East Level 10 - Standard (70MB)
- Europe and Middle East Level 11 - Standard (74MB)
- Europe and Middle East Level 12 - Standard (74MB)
- Greenland
- Greenland Level 00 - Standard (9MB)
- Greenland Level 01-06 - Standard (6MB)
- Greenland Level 01-12 - Standard (48MB)
- Greenland Level 01 - Standard (1MB)
- Greenland Level 02 - Standard (1MB)
- Greenland Level 03 - Standard (1MB)
- Greenland Level 04 - Standard (1MB)
- Greenland Level 05 - Standard (1MB)
- Greenland Level 06 - Standard (2MB)
- Greenland Level 07 - Standard (3MB)
- Greenland Level 08 - Standard (5MB)
- Greenland Level 09 - Standard (8MB)
- Greenland Level 10 - Standard (9MB)
- Greenland Level 11 - Standard (9MB)
- Greenland Level 12 - Standard (9MB)
- North and Central America
- North and Central America Level 00 - Standard (66MB)
- North and Central America Level 01-06 - Standard (33MB)
- North and Central America Level 01-12 - Standard (317MB)
- North and Central America Level 01 - Standard (2MB)
- North and Central America Level 02 - Standard (3MB)
- North and Central America Level 03 - Standard (4MB)
- North and Central America Level 04 - Standard (5MB)
- North and Central America Level 05 - Standard (8MB)
- North and Central America Level 06 - Standard (12MB)
- North and Central America Level 07 - Standard (18MB)
- North and Central America Level 08 - Standard (29MB)
- North and Central America Level 09 - Standard (45MB)
- North and Central America Level 10 - Standard (62MB)
- North and Central America Level 11 - Standard (65MB)
- North and Central America Level 12 - Standard (65MB)
- South America
- South America Level 00 - Standard (74MB)
- South America Level 01-06 - Standard (26MB)
- South America Level 01-12 - Standard (334MB)
- South America Level 01 - Standard (1MB)
- South America Level 02 - Standard (2MB)
- South America Level 03 - Standard (3MB)
- South America Level 04 - Standard (4MB)
- South America Level 05 - Standard (6MB)
- South America Level 06 - Standard (10MB)
- South America Level 07 - Standard (18MB)
- South America Level 08 - Standard (30MB)
- South America Level 09 - Standard (49MB)
- South America Level 10 - Standard (69MB)
- South America Level 11 - Standard (73MB)
- South America Level 12 - Standard (73MB)
- Siberia
- Siberia Level 00 - Standard (64MB)
- Siberia Level 01-06 - Standard (21MB)
- Siberia Level 01-12 - Standard (291MB)
- Siberia Level 01 - Standard (1MB)
- Siberia Level 02 - Standard (1MB)
- Siberia Level 03 - Standard (2MB)
- Siberia Level 04 - Standard (3MB)
- Siberia Level 05 - Standard (6MB)
- Siberia Level 06 - Standard (10MB)
- Siberia Level 07 - Standard (16MB)
- Siberia Level 08 - Standard (27MB)
- Siberia Level 09 - Standard (43MB)
- Siberia Level 10 - Standard (60MB)
- Siberia Level 11 - Standard (63MB)
- Siberia Level 12 - Standard (63MB)
如何在GEE上使用这个数据呢？
HydroSHEDS 是一种地图产品，它以一致的格式为区域和全球范围的应用程序提供水文信息。它提供了一套不同尺度的地理参考数据集（矢量和栅格），包括河网、流域边界、排水方向和流量累积。HydroSHEDS 基于 2000 年美国宇航局航天飞机雷达地形任务 (SRTM) 获得的高程数据。
该数据集基于 15 角秒（赤道处约 500 m）分辨率的栅格数据提供嵌套的分层分水岭多边形。流域范围从 1 级（粗略）到 12 级（详细），使用 Pfastetter 代码。
技术文档：
https://hydrosheds.org/images/inpages/HydroBASINS_TechDoc_v1c.pdf
请注意，北纬 60 度以上地区的 HydroSHEDS 数据质量明显较低，因为没有可用的基础 SRTM 高程数据，因此分辨率较低的 DEM 是（美国地质调查局提供的 HYDRO1k）。
HydroSHEDS 由世界自然基金会 (WWF) 保护科学计划与美国地质调查局、国际热带农业中心、大自然保护协会和德国卡塞尔大学环境系统研究中心合作开发。
2000-02-11T00:00:00 - 2000-02-22T00:00:00
数据集提供者
集合：
已复制
ee.FeatureCollection("WWF/HydroSHEDS/v1/Basins/hybas_10")
代码：
var dataset = ee.FeatureCollection('WWF/HydroSHEDS/v1/Basins/hybas_3');
var visualization = {
color: '808080',
strokeWidth: 1
};
dataset = dataset.draw(visualization);
Map.setCenter(-117.731, 53.033, 7);
Map.addLayer(dataset, null, 'Basins');
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