地表水和海洋地形（SWOT）卫星提供的河流水面高程、宽度和坡度测量数据集

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此星光明 发表于 2024/04/20 16:51:18 2024/04/20
【摘要】 ​ SWOT 河流数据库（SWORD）地表水和海洋地形（SWOT）卫星任务于 2022 年 12 月成功发射，通过提供大量的河流水面高程、宽度和坡度测量数据集，彻底改变了我们观测河流的能力。为了最大限度地提高这些数据的实用性和灵活性，SWOT 任务提供了各种数据产品，包括每个 SWOT 立交桥的 shapefile 格式河流矢量数据。这些矢量产品为河流系统的多时分析提供了巨大的潜力，使研究人...

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 SWOT 河流数据库（SWORD）
地表水和海洋地形（SWOT）卫星任务于 2022 年 12 月成功发射，通过提供大量的河流水面高程、宽度和坡度测量数据集，彻底改变了我们观测河流的能力。为了最大限度地提高这些数据的实用性和灵活性，SWOT 任务提供了各种数据产品，包括每个 SWOT 立交桥的 shapefile 格式河流矢量数据。这些矢量产品为河流系统的多时分析提供了巨大的潜力，使研究人员能够跟踪河流特征随时间的变化。

为了能够进行此类分析，在 SWOT 启动之前定义一致的河流河段和节点至关重要。这可确保来自不同河段的数据能够准确分配和比较。SWOT 河流数据库（SWORD）将与河流和卫星观测有关的多个全球数据集结合在一起，从而发挥了这一关键作用。SWORD 以 shapefile 和 netCDF 两种格式提供了高分辨率河流节点（沿河流中心线每 200 米间隔）和河段（约 10 公里的河段）的标准化框架。这些节点和河段附有一系列相关的水文变量，如水面高程、宽度、坡度以及河流障碍物、流量累积等信息。这个全面的数据集涵盖了全球 30 米宽及以上的河流，使研究人员能够对河流系统进行深入分析，并充分利用 SWOT 数据的潜力。

SWORD 整合了多个现有全球水文地理数据集的数据，包括全球陆地卫星河宽（GRWL）、MERIT Hydro、HydroBASINS 和全球河流阻塞数据库（GROD）。它为每个节点和河段提供了丰富的属性，如

位置：纬度/经度坐标、河段边界。
物理特征：水面高程、宽度、坡度、流量累积、渠道数量、障碍类型（水坝、瀑布等）。
水文模型：各种排泄量估算模型（如 MetroMan、BAM、HiVDI）的参数及相关不确定性。
SWOT 观测信息：在 21 天的轨道周期内，SWOT 经过的次数以及与每个河段交汇的具体轨道轨迹。
其他属性：河流名称、冰覆盖标志、支流标志以及表示潜在拓扑不一致或数据限制的质量标志。

 数据属性

Attribute Description Units
x Longitude of each node ranging from 180°E to 180°W decimal degrees
y Latitude of each node, ranging from 90°S to 90°N decimal degrees
node_id Unique identifier for each node, formatted as: CBBBBBRRRRNNNT (C: Continent, B: Pfafstetter basin codes, R: Reach ID, N: Node ID within reach, T: Type) none
node_length Length of the node measured along the high-resolution centerline points meters
reach_id ID of the reach associated with each node, formatted as: CBBBBBRRRRT (C: Continent, B: Pfafstetter basin codes, R: Reach ID, T: Type) none
wse Average water surface elevation of the node meters
wse_var Variance of water surface elevation along the high-resolution centerline points used to calculate the average water surface elevation for each node meters^2
width Average width of the node meters
width_var Variance of width along the high-resolution centerline points used to calculate the average width for each node meters^2
n_chan_max Maximum number of channels observed within the node none
n_chan_mod Mode (most frequent) number of channels observed within the node none
obstr_type Type of obstruction at the node based on GROD and HydroFALLS databases: 0 - No Dam, 1 - Dam, 2 - Lock, 3 - Low Permeable Dam, 4 - Waterfall none
grod_id Unique GROD ID for nodes with obstr_type values 1-3 none
hfalls_id Unique HydroFALLS ID for nodes with obstr_type value 4 none
dist_out Distance from the river outlet to the node meters
type Node type identifier: 1 - River, 3 - Lake on river, 4 - Dam/waterfall, 5 - Unreliable topology, 6 - Ghost node none
facc Maximum flow accumulation value for the node kilometers^2
lakeflag GRWL water body identifier: 0 - River, 1 - Lake/reservoir, 2 - Canal, 3 - Tidally influenced river none
max_width Maximum width across the channel for the node, including islands and bars meters
river_name All river names associated with the node (separated by semicolons if multiple) none
sinuosity Ratio of total reach length to the straight-line distance between reach endpoints, indicating the degree of meandering none
meand_len Average length of meanders the node belongs to meters
manual_add Binary flag indicating if the node was manually added to GRWL centerlines (1) or not (0) none
trib_flag Binary flag indicating if a large tributary not in SWORD enters the node (1) or not (0) none
Attribute Description Units
x Longitude of the reach center point (ranging from 180°E to 180°W) decimal degrees
y Latitude of the reach center point (ranging from 90°S to 90°N) decimal degrees
reach_id Unique identifier for each reach, formatted as: CBBBBBRRRRT (C: Continent, B: Pfafstetter basin codes, R: Reach ID, T: Type) none
reach_length Length of the reach measured along the high-resolution centerline points meters
wse Average water surface elevation of the reach meters
wse_var Variance of water surface elevation along the high-resolution centerline points used to calculate the average water surface elevation for each reach meters^2
width Average width of the reach meters
width_var Variance of width along the high-resolution centerline points used to calculate the average width for each reach meters^2
n_nodes Number of nodes associated with the reach none
n_chan_max Maximum number of channels observed within the reach none
n_chan_mod Mode (most frequent) number of channels observed within the reach none
obstr_type Type of obstruction within the reach based on GROD and HydroFALLS databases: 0 - No Dam, 1 - Dam, 2 - Lock, 3 - Low Permeable Dam, 4 - Waterfall none
grod_id Unique GROD ID for reaches with obstr_type values 1-3 none
hfalls_id Unique HydroFALLS ID for reaches with obstr_type value 4 none
slope Average slope of the reach calculated along the high-resolution centerline points m/km
dist_out Distance from the river outlet to the reach meters
n_rch_up Number of upstream reaches connected to this reach none
n_rch_down Number of downstream reaches connected to this reach none
rch_id_up IDs of the upstream reaches connected to this reach none
rch_id_dn IDs of the downstream reaches connected to this reach none
lakeflag GRWL water body identifier: 0 - River, 1 - Lake/reservoir, 2 - Canal, 3 - Tidally influenced river none
max_width Maximum width across the channel for the reach, including islands and bars meters
type Reach type identifier: 1 - River, 3 - Lake on river, 4 - Dam/waterfall, 5 - Unreliable topology, 6 - Ghost reach none
facc Maximum flow accumulation value for the reach kilometers^2
swot_obs Maximum number of SWOT passes intersecting the reach during the 21-day orbit cycle none
swot_orbits List of SWOT orbit track numbers that intersect the reach during the 21-day cycle none
river_name All river names associated with the reach (separated by semicolons if multiple) none
trib_flag Binary flag indicating if a large tributary not in SWORD enters the reach (1) or not (0) none

数据处理

海域和节点形状文件数据集已下载压缩，并作为单独的形状文件上传。然后合并文件夹资产，创建单一的节点和河段文件。形状文件中的属性按原样保留。

数据引用

Altenau et al., (2021) The Surface Water and Ocean Topography (SWOT) Mission River Database (SWORD): A Global River Network for Satellite Data
Products. Water Resources Research. https://doi.org/10.1029/2021WR030054

Elizabeth H. Altenau, Tamlin M. Pavelsky, Michael T. Durand, Xiao Yang, Renato P. d. M. Frasson, & Liam Bendezu. (2023). SWOT River Database (SWORD)
(Version v16) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.10013982

代码

var nodes_merged = ee.FeatureCollection("projects/sat-io/open-datasets/SWORD/nodes_merged");
var reaches_merged = ee.FeatureCollection("projects/sat-io/open-datasets/SWORD/reaches_merged");

// Define different styles for each FeatureCollection
var nodeStyle = {
  color: 'red',
  width: 2
};

var reachStyle = {
  color: 'blue',
  width: 1
};

// Add each FeatureCollection with its own style
Map.addLayer(nodes_merged, nodeStyle, 'Nodes');
Map.addLayer(reaches_merged, reachStyle, 'Reaches');

代码链接

https://code.earthengine.google.com/?scriptPath=users/sat-io/awesome-gee-catalog-examples:hydrology/SWORD-NODES-REACHES-MERGED

单个节点和达到文件已被摄入供参考，用户可通过使用

var ee_nodes = ee.data.listAssets("projects/sat-io/open-datasets/SWORD/nodes");
var ee_reaches = ee.data.listAssets("projects/sat-io/open-datasets/SWORD/reaches");

print('Total of '+ee.List(ee_nodes.assets).size().getInfo()+ ' assets in nodes',ee_nodes.assets);
print('Total of '+ee.List(ee_reaches.assets).size().getInfo()+ ' reaches in nodes',ee_reaches.assets);

代码链接

https://code.earthengine.google.com/?scriptPath=users/sat-io/awesome-gee-catalog-examples:hydrology/SWORD-NODES-REACHES

License

The datasets are provided under a Creative Commons 4.0 International License.

Provided by: Altenau et al., (2021)

Curated in GEE by: Samapriya Roy

Keywords: SWORD,SWOT,Rivers,Hydrology,Hydrography,River Networks,Global

Last updated in GEE: 2024-04-12

Copyright © 2020 - 2024 Samapriya Roy

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