USA SSURGO - Erodibility Factor

Soil erodibility factor, also known as K factor, is one of the 5 inputs to the Universal Soil Loss Equation. Soil erodibility factor quantifies the susceptibility of soil particles to detachment and movement by water. For more information on how soil erodibilty factor is calculated see the National Soil Survey Handbook. The Universal Soil Loss Equation is a mathematical model commonly used to estimate soil erosion rates. Originally designed for the management and conservation of farmland soils, the USLE is now used for a variety of other projects such as managing non-point pollution and sediment load in streams. In the United States, the equation is frequently used by federal agencies. For example federal regulations require that the Department of Agriculture identify highly erodible land based on the Universal Soil Loss Equation and its derivative models. Dataset Summary Phenomenon Mapped: Erodibility factor (not adjusted for rock fragments) Geographic Extent: Contiguous United States, Alaska, Hawaii, Puerto Rico, Guam, US Virgin Islands, Northern Mariana Islands, Republic of Palau, Republic of the Marshall Islands, Federated States of Micronesia, and American Samoa. Projection: Web Mercator Auxiliary Sphere Data Coordinate System: WKID 5070 USA Contiguous Albers Equal Area Conic USGS version (contiguous US, Puerto Rico, US Virgin Islands), WKID 3338 WGS 1984 Albers (Alaska), WKID 4326 WGS 1984 Decimal Degrees (Guam, Republic of the Marshall Islands, Northern Mariana Islands, Republic of Palau, Federated States of Micronesia, American Samoa, and Hawaii). Units: None Cell Size: 30 meters Source Type: Discrete Pixel Type: Unsigned integer Source: Natural Resources Conservation Service Update Frequency: Annual Publication Date: December 2025 Data from the gNATSGO database was used to create the layer. This layer is derived from the 30m rasters produced by the Natural Resources Conservation Service (NRCS). This field was calculated by selecting the least transmissive horizon of the dominant component for each mapunit. The values are in units of Micrometers per second (μm/s). In the past this layer used to display an average of components, but this is no longer the case. 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 "erodibility factor" in the search box and browse to the layer. Select the layer then clickAdd 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 "erodibility factor" in the search box, browse to the layer then click OK. In ArcGIS Pro you can use the built-in raster functions or create your own to create custom extracts of the data. Imagery layers provide fast, powerful inputs to geoprocessing tools, models, or Python scripts in Pro. Online you can filter the layer to show subsets of the data using the filter button and the layer"s built-in raster functions. The ArcGIS Living Atlas of the World provides an easy way to explore many other beautiful and authoritative maps on hundreds of topics like this one. 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.土壤可蚀性因子（soil erodibility factor，又称K因子）是通用土壤流失方程（Universal Soil Loss Equation, USLE）的五大输入参数之一。该因子用于量化土壤颗粒被水流分离和搬运的易感性。有关土壤可蚀性因子的具体计算方法，可参阅《国家土壤调查手册》（National Soil Survey Handbook）。 通用土壤流失方程是一种常用于估算土壤侵蚀速率的数学模型。该方程最初旨在服务于农田土壤的管理与保护，如今已被广泛应用于诸多其他场景，例如面源污染治理以及溪流沉积物负荷管控。在美国，联邦机构常采用该方程。例如，联邦法规要求美国农业部基于通用土壤流失方程及其衍生模型，识别高度易侵蚀土地。 数据集摘要 制图现象：可蚀性因子（未针对岩屑进行校正） 地理覆盖范围：美国本土48州、阿拉斯加州、夏威夷州、波多黎各、关岛、美属维尔京群岛、北马里亚纳群岛、帕劳共和国、马绍尔群岛共和国、密克罗尼西亚联邦以及美属萨摩亚 投影方式：Web墨卡托辅助球体（Web Mercator Auxiliary Sphere） 数据坐标系：针对美国本土48州、波多黎各、美属维尔京群岛采用WKID 5070 美国本土阿尔伯斯等面积圆锥投影（USGS版本）；针对阿拉斯加州采用WKID 3338 WGS 1984阿尔伯斯投影；针对关岛、马绍尔群岛共和国、北马里亚纳群岛、帕劳共和国、密克罗尼西亚联邦、美属萨摩亚以及夏威夷州采用WKID 4326 WGS 1984十进制度坐标系 单位：无 像元分辨率：30米 源数据类型：离散型 像元类型：无符号整数 数据源：美国自然资源保护局（Natural Resources Conservation Service, NRCS） 更新频率：年度更新 发布日期：2025年12月 本图层基于gNATSGO数据库制作，其源数据为美国自然资源保护局（NRCS）生成的30米分辨率栅格数据。该字段通过为每个制图单元选取优势组分中透水性最弱的发生层计算得到，数值单位为微米每秒（μm/s）。此前该图层曾展示组分的平均值，但现已不再沿用此计算方式。 本图层的应用场景： 本图层可适配ArcGIS生态系统内的可视化与分析工作。您可将其与自有数据及ArcGIS世界生活地图集（ArcGIS Living Atlas of the World）中的其他图层结合，在ArcGIS Online或ArcGIS Pro中创建功能强大的Web地图，既可单独使用，也可嵌入故事地图或其他应用程序中。 在ArcGIS Online中添加本图层的步骤如下：依次点击「添加」→「浏览生活地图集图层」，将弹出窗口；在搜索框中输入"erodibility factor"，浏览至目标图层后选中并点击「添加至地图」。 在ArcGIS Pro中添加本图层的步骤如下：打开地图后，点击「地图」选项卡中的「添加数据」；在下拉菜单顶部选择「数据」，将弹出「添加数据」对话框；若需展开门户选项，则点击展开，随后选择「生活地图集」；在搜索框中输入"erodibility factor"，浏览至目标图层后点击「确定」。 在ArcGIS Pro中，您可使用内置栅格工具或自定义工具，对数据进行定制化提取。影像图层可为Pro中的地理处理工具、模型或Python脚本提供高效且强大的输入源。在在线平台中，您可通过筛选按钮及图层内置的栅格函数，对数据子集进行展示筛选。 ArcGIS世界生活地图集提供了便捷途径，可让您探索数百个主题下的众多优质权威地图，本图层仅是其中之一。 如有疑问？若您对本图层有任何问题，请在下方留言，我们将尽快回复。