Soil Colors CONUS 125 cm 2022
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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: 1.0.0
soil_colors_conus服务展示了美国本土各州市在特定深度下的聚合土壤颜色数据。此处呈现的土壤颜色数据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保留了其原始数据源的原生分辨率。该土壤颜色地图整合了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（Official Series Descriptions，OSDs）的快照，以及与土壤调查地理数据库（Soil Survey Geographic Database，SSURGO）要素关联的土柱（pedon）快照（此类土柱数据不属于公开数据源）。土壤颜色的空间分布基于2022财年gNATSGO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：优先使用要素记录与对应土柱的显式关联（若可用），否则通过要素名称匹配土系名称建立关联。在单个土壤图斑内，通过要素占比确定各深度切片下出现频率最高的土壤颜色。 在条件允许的情况下，土壤颜色地图共生成8个深度切片（5cm、10cm、15cm、25cm、50cm、75cm、100cm、125cm），对于位于基岩接触面以下的切片，使用占位符岩石色（N 8/0）。岩石色同样适用于以岩石露头、碎石地、河床冲刷区、城市用地、坑塘、弃渣场以及劣地为主的图斑。此外，还为以水体为主的图斑（5PB 1/22）和干盐湖（playas）分别指定了专用颜色（5Y 8/2）。 针对每个主要土地资源区（Major Land Resource Areas，MLRA）多边形，依据区内分布最广泛的土系，为其分配出现频率最高的湿润土壤颜色；该颜色将作为备用方案，用于无法通过其他方式分配颜色的gNATSGO网格单元。 针对每个深度切片，各gNATSGO网格单元的湿润土壤颜色将按照以下逻辑分配：1. 若可用，优先使用RV要素对应土柱的土壤颜色；2. 否则尝试使用匹配的官方土系描述中的颜色；3. 若当前切片位于基岩接触面以下，则使用岩石色；4. 否则为其他杂类区域要素（如水陆、岩石或干盐湖）使用对应占位符颜色；5. 最后通过主要土地资源区填充最可能的土壤颜色。 研究人员通过视觉比对土壤颜色与地貌位置（如因水分有效性更高、植被更繁茂而通常颜色更深的汇水廊道）对土壤颜色进行了定性评估。本数据集生成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边界划分或分类单元将被邻近单元合并，此类情况通常出现在土壤调查区域的边界处。 本数据集包含基于孟塞尔颜色标注（Munsell color notations）转换得到的RGB值唯一查找表，转换过程通过R语言中的aqp包完成。 本数据集并非旨在作为许可或引用决策中的主要监管工具，但可作为参考来源使用。 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：定期随新土壤颜色数据更新 版本：1.0.0
