Soil Colors CONUS 75 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（全美土壤颜色数据集）服务展示了特定深度下各州的聚合土壤颜色数据。本数据集所呈现的土壤颜色，源自美国国家合作土壤调查（National Cooperative Soil Survey）体系下累计超百年的土壤调查工作成果。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。本次土壤颜色地图通过空间与表格数据源结合制作，共涵盖8个深度切片。原状土壤湿度颜色数据取自官方土壤系列描述（Official Series Descriptions, OSDs）的快照，以及与SSURGO要素绑定的土柱（pedon）快照（要素土柱不属于公开数据源）。土壤颜色的空间分布基于2022财年gNATSGO地图单元密钥网格（30米分辨率）。gNATSGO网格单元与表格数据的关联逻辑为：若存在要素记录与要素土柱的明确关联，则采用该关联；否则通过要素名称匹配土壤系列名称建立关联。在单个地图单元内，通过要素占比确定每个深度切片下出现频率最高的土壤颜色。土壤颜色地图尽可能覆盖8个深度切片（5厘米、10厘米、15厘米、25厘米、50厘米、75厘米、100厘米、125厘米），在基岩接触面以下的切片将使用占位符岩石色（N 8/0）。若地图单元以岩石露头、碎石地、河道冲积物、城市用地、坑洼、弃土堆及劣地为主，同样使用岩石色。针对以水体为主的地图单元（5PB 1/22）与干盐湖（playas，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）多边形，依据该区域内制图覆盖最广的土壤系列，分配出现频率最高的（原状）土壤湿度颜色。当无法为gNATSGO网格单元分配其他颜色时，将使用该备份颜色。针对每个深度切片，将按照以下逻辑为每个gNATSGO网格单元分配原状土壤湿度颜色：1. 若存在RV要素土柱的土壤颜色，则直接采用；2. 否则尝试通过匹配的OSD获取土壤颜色；3. 若当前切片位于基岩接触面以下，则使用岩石色；4. 若为其他杂类区域要素（如水体、岩石或干盐湖），则使用对应占位符颜色；5. 最后依据MLRA区域分配最匹配的土壤颜色。土壤颜色数据通过目视对比进行定性评估：例如排水道区域因有效水分充足、植被生长旺盛，通常颜色更深，以此作为参照验证颜色合理性。生成土壤颜色数据的最高水平分辨率为30米，因此任何小于该阈值的土壤勾绘图斑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。本数据集采用唯一查找值关联孟塞尔颜色标注，并通过R语言的aqp软件包将孟塞尔颜色值转换为RGB色彩值。本数据集并非为审批或决策引用中的主要监管工具设计，仅可作为参考数据源使用。用途：提供全美土壤颜色影像数据。创建日期：2022年。发布日期：2023年3月17日。修订日期：未明确标注。更新周期：当有新的土壤颜色数据获取时定期更新。版本：1.0.0