USA Wetlands

Retirement Notice: This item is in mature support as of April 2026 and will be retired in December 2027. A new version of this item is available for your use. Esri recommends updating your maps and apps to use the new version. Wetlands are areas where water is present at or near the surface of the soil during at least part of the year. Wetlands provide habitat for many species of plants and animals that are adapted to living in wet habitats. Wetlands form characteristic soils, absorb pollutants and excess nutrients from aquatic systems, help buffer the effects of high flows, and recharge groundwater. Data on the distribution and type of wetland play an important role in land use planning and several federal and state laws require that wetlands be considered during the planning process. The National Wetlands Inventory (NWI) was designed to assist land managers in wetland conservation efforts. The NWI is managed by the US Fish and Wildlife Service. Dataset Summary Phenomenon Mapped: Wetlands Geographic Extent: 50 United States plus Puerto Rico, the US Virgin Islands, Palmyra Atoll, Guam, American Samoa, and the Northern Mariana Islands Projection: Web Mercator Auxiliary Sphere Visible Scale: This layer preforms well between scales of 1:1,000,000 to 1:1,000. An imagery layer created from this dataset is also available which you can also use to quickly draw wetlands at smaller scales. Source: U.S. Fish and Wildlife Service Update Frequency: Annual Publication Date: October, 2025 This layer was created from the October, 2025 version of the NWI. The features were converted from multi-part to a single part using the Multipart To Singlepart tool. Features with more than 50,000 vertices were split with the Dice tool. The Repair Geometry tool was run on the features, using the OGC option. The layer is published with a related table that contains text fields created by Esri for use in the layer's pop-up. Fields in the table are: Popup Header - this field contains a text string that is used to create the header in the default pop-up System Text - this field contains a text string that is used to create the system description text in the default pop-up Class Text - this field contains a text string that is used to create the class description text in the default pop-up Modifier Text - this field contains a text string that is used to create the modifier description text in the default pop-up Species Text - this field contains a text string that is used to create the species description text in the default pop-up Codes, names, and text fields were derived from the publication Classification of Wetlands and Deepwater Habitats of the United States. What can you do with this layer? Feature layers work throughout the ArcGIS system. Generally your work flow with feature layers will begin in ArcGIS Online or ArcGIS Pro. Below are just a few of the things you can do with a feature service in Online and Pro. ArcGIS Online Add this layer to a map in the map viewer. The layer is limited to scales of approximately 1:1,000,000 or larger but an imagery layer created from the same data can be used at smaller scales to produce a webmap that displays across the full scale range. The layer or a map containing it can be used in an application. Change the layer’s transparency and set its visibility range Open the layer’s attribute table and make selections and apply filters. Selections made in the map or table are reflected in the other. Center on selection allows you to zoom to features selected in the map or table and show selected records allows you to view the selected records in the table. Change the layer’s style and filter the data. For example, you could set a filter for System Name = 'Palustrine' to create a map of palustrine wetlands only. Add labels and set their properties Customize the pop-up ArcGIS Pro Add this layer to a 2d or 3d map Use as an input to geoprocessing. For example, copy features allows you to select then export portions of the data to a new feature class. Change the symbology and the attribute field used to symbolize the data Open table and make interactive selections with the map Modify the pop-ups Apply Definition Queries to create sub-sets of the layer This layer is part of the Living Atlas of the World that provides an easy way to explore the landscape layers and many other beautiful and authoritative maps on hundreds of topics. Questions? Please leave a comment below if you have a question about this layer, and we will get back to you as soon as possible.停用通知：本数据集自2026年4月起进入成熟支持阶段，将于2027年12月正式停用。目前已有新版本可供使用，Esri建议您更新相关地图与应用以适配新版本。 湿地指一年中至少有一段时间土壤表面或近地表存在积水的区域。湿地为诸多适应湿润生境的动植物物种提供栖息场所，同时形成独特的土壤类型，可吸收水生系统中的污染物与过量营养盐，有助于缓冲洪水冲击并补给地下水。湿地分布与类型数据在土地利用规划中具有重要作用，多项联邦及州级法律均要求在规划过程中纳入湿地考量因素。 国家湿地普查（National Wetlands Inventory, NWI）旨在助力土地管理者开展湿地保护工作，由美国鱼类及野生动物管理局负责管理。 ### 数据集概况 - 测绘对象：湿地 - 地理覆盖范围：美国50个州，以及波多黎各、美属维尔京群岛、巴尔米拉环礁、关岛、美属萨摩亚及北马里亚纳群岛 - 投影：Web Mercator Auxiliary Sphere - 可见比例尺范围：该图层在1:1,000,000至1:1,000的比例尺范围内表现优异。基于本数据集制作的影像图层同样可供使用，可在更小比例尺下快速绘制湿地分布。 - 数据来源：美国鱼类及野生动物管理局 - 更新频率：年度更新 - 发布日期：2025年10月 本图层基于2025年10月版的NWI数据制作。通过「多部件转单部件（Multipart To Singlepart）」工具将要素从多部件转换为单部件；针对顶点数超过50000的要素，使用「分割（Dice）」工具进行拆分；采用OGC选项运行「修复几何」工具处理要素几何问题。 本图层附带关联属性表，其中包含Esri为该图层弹出窗口开发的文本字段，各字段说明如下： - 弹出窗口标题（Popup Header）：用于生成默认弹出窗口标题的文本字符串 - 系统描述文本（System Text）：用于生成默认弹出窗口系统描述内容的文本字符串 - 分类描述文本（Class Text）：用于生成默认弹出窗口分类说明的文本字符串 - 修饰符描述文本（Modifier Text）：用于生成默认弹出窗口修饰符说明的文本字符串 - 物种描述文本（Species Text）：用于生成默认弹出窗口物种说明的文本字符串 本数据集的代码、名称及文本字段均源自官方出版物《美国湿地与深水栖息地分类》。 ### 可使用该图层开展的操作 要素图层可在整个ArcGIS生态系统中使用，通常您的工作流程将始于ArcGIS Online或ArcGIS Pro。以下为您可在Online与Pro中使用要素服务开展的部分操作： #### ArcGIS Online 1. 将该图层添加至地图查看器中的地图内。本图层仅支持1:1,000,000及更大比例尺的显示，但基于同一数据集制作的影像图层可适配更小比例尺，用于制作覆盖全比例尺范围的网页地图。 2. 可将该图层或包含该图层的地图集成至应用程序中。 3. 调整图层透明度并设置可见比例尺范围。 4. 打开图层属性表，执行要素选择与数据筛选操作，地图与属性表中的选择结果将实时同步。 5. 使用「居中至所选要素」功能可缩放至地图或属性表中选中的要素，「显示所选记录」功能可在属性表中查看已选中的记录。 6. 修改图层样式并对数据进行筛选。例如，可设置筛选条件「系统名称 = 'Palustrine'」，仅绘制泛洪平原湿地的地图。 7. 添加要素标注并设置标注属性。 8. 自定义弹出窗口样式。 #### ArcGIS Pro 1. 将该图层添加至二维或三维地图中。 2. 用作地理处理工具的输入数据。例如，使用「复制要素」工具可选中并将部分数据导出至新的要素类中。 3. 修改符号系统及用于符号化的属性字段。 4. 打开属性表并结合地图进行交互式要素选择。 5. 修改弹出窗口样式。 6. 应用定义查询以生成图层的子集数据。 本图层隶属于世界生活地图集（Living Atlas of the World），该图集提供便捷途径，可用于探索景观图层及数百个主题下的诸多精美权威地图。 如有疑问？请在下方留言咨询本图层相关问题，我们将尽快回复您。