Soil Colors CONUS 25 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: 20230203 Revision Date: Refresh Cycle: Periodically as new soil color data becomes available Version: 1.0.0soil_colors_conus 服务展示了特定深度下美国本土各州的聚合土壤颜色数据。本数据集所呈现的土壤颜色，源自长达百余年的全国合作土壤调查工作成果。30米分辨率的土壤颜色数据图层，保留了其原始数据源的原生分辨率。本土壤颜色地图集整合空间与表格数据源进行构建，共涵盖8个深度切片。湿润态土壤颜色源自官方土系描述（Official Series Descriptions, OSDs）的快照数据，以及关联至州土壤调查地理数据库（State Soil Geographic Database, SSURGO）要素的土壤剖面（pedon）快照数据（注：该要素剖面数据并非公开数据源）。土壤颜色的空间排布基于2022财年通用国家土壤调查地理数据库（Generalized National Soil Survey Geographic Database, gNATSGO）的图斑关键字网格（30米分辨率）。gNATSGO网格单元与表格数据的关联逻辑为：若要素记录与要素剖面存在显式关联，则采用该关联；否则通过要素名称匹配土系名称来建立关联。在单个图斑内部，通过要素占比计算得到每个深度切片下出现频率最高的土壤颜色。本数据集尽可能生成了8个深度切片（5cm、10cm、15cm、25cm、50cm、75cm、100cm、125cm）的土壤颜色地图，在基岩接触面以下的深度切片中，将使用占位符岩石颜色（N 8/0）。若图斑主要为岩石露头、碎石地、河床冲积物、城市用地、坑塘、弃土堆及劣地，则同样使用该岩石颜色作为占位符。针对主要为水体的图斑（5PB 1/22）与干盐湖图斑（5Y 8/2），也分配了专属颜色。针对每个主要土地资源区（Major Land Resource Areas, MLRA）的多边形要素，将依据该区域内分布最广泛的土系，分配出现频率最高的湿润态土壤颜色；当无法为gNATSGO网格单元分配其他颜色时，将采用该MLRA的备用颜色。针对每个深度切片，将按照以下逻辑为每个gNATSGO网格单元分配湿润态土壤颜色：1. 若存在RV要素剖面的土壤颜色，则优先采用该颜色；2. 尝试通过匹配OSD获取土壤颜色；3. 若当前深度切片位于基岩接触面以下，则使用岩石颜色；4. 针对混合区域要素（如水体、岩石或干盐湖）使用对应的占位符颜色；5. 按照MLRA分配最可能的土壤颜色。研究人员通过目视对比土壤颜色与地形位置的关联，对土壤颜色进行了定性评估：例如汇水通道区域因水分供给充足、植被生长旺盛，通常颜色更深。本数据集生成土壤颜色时所采用的最高水平分辨率为30米，因此任何小于该阈值的土壤划定单元或分类均会被相邻单元合并，该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记法相关的唯一查找值，通过R语言的aqp包将孟塞尔颜色转换为RGB值。本数据集并非为许可或决策引用的主要监管工具而设计，仅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数据。创建日期：2022年。发布日期：20230203（即2023年2月3日）。修订日期：无。更新周期：定期更新，直至有新的土壤颜色数据发布。版本：1.0.0