Soil Colors CONUS 5 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 threshold 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: 20221211 Revision Date: Refresh Cycle: Periodically as new soil color data becomes availablesoil_colors_conus 数据集服务可展示美国本土范围内，各州在特定深度下的聚合土壤颜色数据。本数据集所呈现的土壤颜色，源自超过百年的全国合作土壤调查（National Cooperative Soil Survey）工作成果。 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。土壤颜色地图融合空间与表格两类数据源，共涵盖8个深度切片。湿润土壤颜色数据源自官方土系描述（OSDs，Official Series Descriptions）的快照，以及与SSURGO地理数据库组分相关联的单个土体（pedon）快照（此类组分单个土体不属于公开数据源）。 土壤颜色的空间分布基于2022财年广义国家土壤调查地理数据库（gNATSGO）的地图单元关键字格网（分辨率30米）。gNATSGO格网单元与表格数据的关联逻辑为：优先采用组分记录与组分单个土体的显式关联（若可获取），否则通过组分名称匹配土系名称完成关联。在单个地图单元内，通过组分占比确定每个深度切片下最具代表性的土壤颜色。 本次土壤颜色地图尽可能生成了8个深度切片（5cm、10cm、15cm、25cm、50cm、75cm、100cm、125cm）；对于基岩接触面以下的深度切片，将使用占位符岩石颜色（N 8/0）。该岩石颜色也适用于以裸露岩石、碎石地、河流冲积滩、城市用地、坑塘、废渣堆及劣地为主的地图单元。此外，我们为以水体景观为主的地图单元分配了专属颜色（5PB 1/22），为干盐湖（playa）分配了专属颜色（5Y 8/2）。 根据每个主要土地资源区（MLRA）内分布最广泛的土系，为该区域内的所有多边形分配最具代表性的湿润土壤颜色；当无法为gNATSGO格网单元分配其他颜色时，将采用该颜色作为备用方案。 针对每个深度切片，我们将按照以下逻辑为每个gNATSGO格网单元分配湿润土壤颜色：1. 若可获取，则使用RV组分单个土体的土壤颜色；2. 若无法获取，则尝试使用匹配的官方土系描述中的土壤颜色；3. 若目标深度位于基岩接触面以下，则使用岩石颜色；4. 若为水体、岩石或干盐湖等杂类区域组分，则使用对应占位符颜色；5. 若以上条件均不满足，则使用该主要土地资源区最具代表性的土壤颜色进行填充。 研究人员通过视觉对比土壤颜色与对应地貌位置对其开展了定性评估：例如汇水通道因可利用水分更多、植被生长更旺盛，通常颜色更深。本次土壤颜色数据生成所采用的最高水平分辨率为30米，因此所有小于该阈值的土壤描边或分类将被邻近单元合并，此类情况通常出现在土壤调查区域的边界处。 本数据集包含与孟塞尔颜色标注法（Munsell color notations）相关的唯一查找值，此类颜色值通过R语言的aqp包转换为RGB色彩空间。本数据集并非设计用于作为许可或引用决策的主要监管工具，但可作为参考数据源使用。 数据集用途：提供美国本土土壤颜色影像。 创建日期：2022年 发布日期：20221211 修订日期： 更新周期：随新土壤颜色数据的获取定期更新