Soil Colors CONUS 100 cm 2022

The soil_colors_conus services show the aggregated soil color for each state at specific depths. The soil colors represented here express over 100 years of soil survey work carried out as part of the National Cooperative Soil Survey. The 30 meter soil color data layers express the native resolution of the data sources from which they were compiled. The soil color maps were created using a combination of spatial and tabular data sources and representing 8 depth slices. Moist soil colors were derived from a snapshot of the Official Series Descriptions (OSDs), and a snapshot of pedons linked to SSURGO components (component pedons, not a public data source). The spatial arrangement of soil color is based on the FY22 gNATSGO map unit key grid (30m). Linkages between gNATSGO grid cell and tabular data are based on explicit links between component records and component pedons when available, or matching component name to a soil series name. Within map units, the most frequent soil color (for each depth slice) was determined via component percentage. Soil colors maps were developed at 8 depth slices (5cm, 10cm, 15cm, 25cm, 50cm, 75cm, 100cm, 125cm) when possible, with a place-holder ROCK color (N 8/0) used in slices below contact with bedrock. The ROCK color was also used for map units containing mostly rock outcrop, rubble land, river wash, urban land, pits, dumps, and badlands. Special colors were also assigned to map units containing mostly water features (5PB 1/22) and playas (5Y 8/2). The most frequent (moist) soil color was assigned to each MLRA polygon, according to the most extensively mapped soil series within each MLRA. These colors were used as a backup when no other color could be assigned to a gNATSGO grid cell. For each depth slice, a moist soil color was assigned to each gNATSGO grid cell according to the following logic: 1. if present, use soil color from the RV component pedon, otherwise 2. attempt to use soil color from matching OSD, otherwise 3. use ROCK color if the given slice is below contact with bedrock, otherwise 4. use one of the place-holder colors for misc. area components such as WATER, ROCK, or PLAYAS, otherwise 5. fill with the most-likely soil color by MLRA. Soil colors were qualitatively evaluated by visually comparing soil color to landform positions such as drainageways normally having darker colors due to increased available moisture and more vigorous vegetation production. The finest horizontal resolution used to generate soil colors is 30 meters, therefore any soil delineation or class smaller than this threshod is lost to a neighbor. This would typically occur at the boundaries of a soil survey area. Unique lookup value relating to Munsell color notations converted to RGB values using the aqp package in R. This data set is not designed for use as a primary regulatory tool in permitting or citing decisions, but may be used as a reference source. Purpose: To provide soil colors conus imagery. Creation Date: 2022 Publication Date: 20230317 Revision Date: Refresh Cycle: Periodically as new soil color data becomes available Version: 1.0.0soil_colors_conus服务展示了美国本土范围内各州特定深度的聚合土壤颜色数据。此处呈现的土壤颜色源自逾百年的国家合作土壤调查（National Cooperative Soil Survey）工作成果。该30米分辨率的土壤颜色数据图层，完整保留了其原始数据源的空间分辨率。 土壤颜色地图通过整合空间与表格数据源生成，共涵盖8个深度切片。湿润土壤颜色源自官方系列描述（OSDs）的快照，以及与SSURGO要素关联的剖面（要素剖面，非公开数据源）的快照。 土壤颜色的空间分布基于2022财年通用国家土壤地理数据库（gNATSGO）的图斑密钥网格（30米分辨率）。gNATSGO网格单元与表格数据的关联，优先采用要素记录与要素剖面的显式关联（若可用），否则通过要素名称匹配土壤系列名称实现。在图斑内部，通过要素占比确定每个深度切片下最常见的土壤颜色。 在可行情况下，土壤颜色地图生成了8个深度切片（5cm、10cm、15cm、25cm、50cm、75cm、100cm、125cm）的图层；当土层深度超过基岩接触面时，使用占位符岩石颜色（N 8/0）。该岩石颜色同样适用于以岩石露头、碎石地、河漫滩、城市用地、坑塘、弃渣场及劣地为主的图斑。此外，为以水体为主的图斑（5PB 1/22）和干盐湖分别指定了特殊颜色（5Y 8/2）。 针对每个主要土地资源区（MLRA）多边形，根据区内分布最广泛的土壤系列，分配最具代表性的（湿润）土壤颜色；当无法为gNATSGO网格单元分配其他颜色时，将采用该颜色作为备用值。 针对每个深度切片，将按照以下逻辑为每个gNATSGO网格单元分配湿润土壤颜色：1. 若可用，优先采用RV要素剖面的土壤颜色；2. 否则尝试使用匹配的官方系列描述（OSD）中的土壤颜色；3. 若当前深度超过基岩接触面，则使用岩石颜色；4. 否则使用水体、岩石或干盐湖等杂类区域要素的占位符颜色；5. 最后通过主要土地资源区（MLRA）匹配最可能的土壤颜色进行填充。 土壤颜色通过目视比对进行定性评估，例如将土壤颜色与地形位置对比——排水沟渠因水分有效性更高、植被生长更旺盛，通常颜色更深。生成土壤颜色数据的最高水平分辨率为30米，因此小于该阈值的土壤边界或分类将被邻近单元合并，这种情况通常出现在土壤调查区域的边界处。 本数据集通过R语言的aqp包（aqp package in R）将孟塞尔颜色标注（Munsell color notations）转换为RGB值，生成唯一的查找值。本数据集并非旨在作为许可或决策引用的主要监管工具，但可作为参考源使用。 用途：提供美国本土土壤颜色影像。 创建日期：2022年 发布日期：20230317 修订日期： 更新周期：定期随新的土壤颜色数据更新 版本：1.0.0