National Riparian Area Base Map

This imagery layer shows national riparian areas for the conterminous United States. Riparian areas are an important natural resource with high biological diversity. These ecosystems contain specific vegetation and soil characteristics which support irreplaceable values and multiple ecosystem functions and are very responsive to changes in land management activities. Delineating and quantifying riparian areas is an essential step in riparian monitoring, planning, management, and policy decisions. USDA Forest Service supports the development and implementation of a national context framework with a multi-scale approach to define riparian areas utilizing free available national geospatial datasets. Why was this layer created? To estimate 50-year flood height riparian areas to support statistical analysis, map display, and model parameterization. Provide a framework and an end product to stakeholders and apply the information into management actions and strategies. Multi-scale approach to provide a national and regional report map. Create a product for managers to easily understand where to apply the information at various scales. Develop a national context inventory of riparian areas and their condition within national forests and rangelands. How was this layer created? Using freely available data. Develop cost effective modeling approach & technique. Multi-scale (national, regional, & local). Promote technology transfer to train/reach out to our partners. Fifty-year flood heights were estimated using U.S. Geological Survey (USGS) stream gage information. NHDPlus version 2.1 was used as the hydrologic framework to delineate riparian areas. The U.S. Fish and Wildlife Service's National Wetland Inventory and USGS 10-meter digital elevation models were also used in processing these data. The data are '1' if in the riparian zone and 'NoData' if outside the riparian zone. When displayed on a map, riparian zone cells are color-coded 'blue' with 25% transparency. For additional information regarding methodologies for modeling and processing these data, see Abood et al. (2012) and the National Riparian Areas Base Map StoryMap Data Download: https://www.fs.usda.gov/rds/archive/catalog/RDS-2019-0030本影像图层展示了美国本土的国家级河岸带（riparian areas）分布。河岸带是一类兼具极高生物多样性的重要自然资源，其生态系统拥有独特的植被与土壤特征，承载着不可替代的生态价值与多重生态系统服务功能，且对土地管理活动的变化响应极为敏感。划定并量化河岸带范围，是开展河岸带监测、规划、管理及政策制定的核心环节。 美国农业部林务局（USDA Forest Service）支持构建国家级河岸带基准框架，采用多尺度方法，依托免费公开的国家级地理空间数据集定义河岸带范围。本图层的制作目的包括：估算50年一遇洪水高度对应的河岸带范围，以支撑统计分析、地图可视化与模型参数化；为利益相关方提供研究框架与最终成果，并将相关信息应用于管理实践与策略制定；采用多尺度方法生成国家级与区域级报告地图；开发便于管理人员在不同尺度下快速定位信息应用场景的产品；构建美国国家森林与牧场范围内的河岸带及其现状的国家级基准清查数据库。 本图层的制作流程如下：依托免费公开的数据集，开发兼具成本效益的建模方法与技术路线，覆盖国家、区域与地方三级多尺度应用；促进技术转化，用于培训合作方并对接其业务需求；采用美国地质调查局（U.S. Geological Survey, USGS）的水文站实测数据估算50年一遇洪水高度；以NHDPlus 2.1版作为水文框架完成河岸带范围划定；数据处理过程中还使用了美国鱼类及野生动物管理局（U.S. Fish and Wildlife Service）的国家湿地清单（National Wetland Inventory）以及美国地质调查局10米分辨率数字高程模型。 该数据集的编码规则为：河岸带内的像元取值为‘1’，河岸带外的像元为‘无数据（NoData）’。在地图可视化时，河岸带像元将以25%透明度的蓝色进行符号编码显示。 如需了解建模与数据处理的详细方法，可参考Abood等人（2012）的研究成果以及《国家河岸带基础地图故事地图（StoryMap）》。数据下载链接：https://www.fs.usda.gov/rds/archive/catalog/RDS-2019-0030