HUC2 Boundaries of Indiana 2025

Source data found here: https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer Each drainage area is considered a Hydrologic Unit (HU) and is given a Hydrologic Unit Code (HUC) which serves as the unique identifier for the area. HUC 2s, 6s, 8s, 10s, & 12s, define the drainage Regions, Subregions, Basins, Subbasins, Watersheds and Subwatersheds, respectively, across the United States. Their boundaries are defined by hydrologic and topographic criteria that delineate an area of land upstream from a specific point on a river and are determined solely upon science based hydrologic principles, not favoring any administrative boundaries, special projects, or a particular program or agency. The Watershed Boundary Dataset is delineated and georeferenced to the USGS 1:24,000 scale topographic basemap. Hydrologic Units are delineated to nest in a multi-level, hierarchical drainage system with corresponding HUCs, so that as you move from small scale to large scale the HUC digits increase in increments of two. For example, the very largest HUCs have 2 digits, and thus are referred to as HUC 2s, and the very smallest HUCs have 12 digits, and thus are referred to as HUC 12s. Dataset Summary Phenomenon Mapped: Watersheds in the United States, as delineated by the Watershed Boundary Dataset (WBD) Geographic Extent: Contiguous United States, Alaska, Hawaii, Puerto Rico, Guam, US Virgin Islands, Northern Marianas Islands and American Samoa Projection: Web Mercator Update Frequency: Annual Visible Scale: Visible at all scales, however USGS recommends this dataset should not be used for scales of 1:24,000 or larger. Source: United States Geological Survey Publication Date: January 7, 2025 What can you do with this layer? This layer is suitable for both visualization and analysis acrossthe ArcGIS system. This layer can be combined with your data and other layers from the ArcGIS Living Atlas of the World in ArcGIS Online and ArcGIS Pro to create powerful web maps that can be used alone or in a story map or other application. Because this layer is part of the ArcGIS Living Atlas of the World it is easy to add to your map: In ArcGIS Online, you can add this layer to a map by selecting Add then Browse Living Atlas Layers. A window will open. Type "subsidence" in the search box and browse to the layer. Select the layer then click Add to Map. In ArcGIS Pro, open a map and select Add Data from the Map Tab. Select Data at the top of the drop down menu. The Add Data dialog box will open on the left side of the box, expand Portal if necessary, then select Living Atlas. Type "subsidence" in the search box, browse to the layer then click OK.源数据获取地址：https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer 每个排水区域均被视为水文单元（Hydrologic Unit, HU），并被分配水文单元代码（Hydrologic Unit Code, HUC）作为该区域的唯一标识符。HUC 2级、6级、8级、10级与12级分别对应美国境内的排水大区、副大区、流域、副流域、小流域与子流域。其边界依据水文与地形标准划定，勾勒出河流特定点位上游的陆地区域，且完全基于科学水文原则确定，不偏袒任何行政边界、专项工程或特定项目与机构。本流域边界数据集（Watershed Boundary Dataset, WBD）已完成数字化勾绘，并参照美国地质调查局（United States Geological Survey, USGS）1:24000比例尺地形底图进行地理配准。 水文单元以嵌套式多级层级排水系统进行勾绘，并匹配对应的HUC编码，当从小比例尺切换至大比例尺时，HUC的位数将以2为增量递增。例如，级别最高的HUC为2位，即HUC 2级；级别最低的HUC为12位，即HUC 12级。 数据集摘要 映射现象：美国境内由流域边界数据集（WBD）勾绘的流域 地理覆盖范围：美国本土、阿拉斯加、夏威夷、波多黎各、关岛、美属维尔京群岛、北马里亚纳群岛和美属萨摩亚 投影方式：Web Mercator 更新频率：年度更新 可视比例尺：全比例尺均可显示，但美国地质调查局建议本数据集不适用于1:24000或更大比例尺的应用场景 数据来源：美国地质调查局 发布日期：2025年1月7日 该图层可实现的应用场景 本图层适用于ArcGIS系统中的可视化与分析工作。可将其与您自有数据及ArcGIS世界生活地图集（ArcGIS Living Atlas of the World）中的其他图层相结合，在ArcGIS Online与ArcGIS Pro中创建功能强大的Web地图，可单独使用，或集成于故事地图或其他应用程序中。由于本图层属于ArcGIS世界生活地图集的一部分，因此可轻松添加至地图中： 在ArcGIS Online中，可通过依次选择"添加"→"浏览生活地图集图层"将本图层添加至地图。此时将弹出窗口，在搜索框中输入"subsidence"，浏览至目标图层并选中后，点击"添加至地图"即可。 在ArcGIS Pro中，打开地图并选择"地图"选项卡中的"添加数据"。在下拉菜单顶部选择"数据"，此时左侧将弹出"添加数据"对话框，若未展开门户（Portal）则先展开，随后选择"生活地图集"。在搜索框中输入"subsidence"，浏览至目标图层后点击"确定"即可。