WA Soils

For large areas, like Washington State, download as a file geodatabase. Large data sets like this one, for the State of Washington, may exceed the limits for downloading as shape files, excel files, or KML files. For areas less than a county, you may use the map to zoom to your area and download as shape file, excel or KML, if that format is desired. Information for SOILS data layer was derived from the Private Forest Land Grading system (PFLG) and subsequent soil surveys. PFLG was a five-year mapping program completed in 1980 for the purpose of forestland taxation. It was funded by the Washington State Department of Revenue. The Department of Natural Resources, Soil Conservation Service (now known as the Natural Resources Conservation Service or NRCS), USDA Forest Service and Washington State University conducted soil mapping cooperatively following national soil survey standards. Private lands having the potential of supporting commercial forests were surveyed along with interspersed small areas of State lands, Indian tribal lands, and federal lands. Because this was a cooperative soil survey project, agricultural and non-commercial forestlands were included within some survey areas. After the Department of Natural Resources originally developed its geographic information system, digitized soil map unit delineations and a few soil attributes were transferred to the system. Remaining PFLG soil attributes were later added and are now available through associated lookup tables. SCS (NRCS) soils data on agricultural lands also have been subsequently added to this data layer. The SOILS data layer includes approximately 1,100 townships with wholly or partially digitized soils data. State and private lands which have the potential of supporting commercial forest stands were surveyed. Some Indian tribal and federal lands were surveyed. Because this was a cooperative soils survey project, agricultural and non-commercial forestlands were also included within some survey areas. After the Department of Natural Resources originally developed its geographic information system, digitized soils delineations and a few soil attributes were transferred to the system. Remaining PFLG soil attributes were added at a later time and are now available through associated lookup tables. SCS soils data on agricultural lands also have subsequently been added to this data layer. This layer includes approximately 1, 100 townships with wholly or partially digitized soils data (2,101 townships would provide complete coverage of the state of Washington).- The soils_sv resolves one to many relationships and as such is one of those special "DNR" spatial views ( ie. is implemented similar to a feature class). Column names may not match between SOILS_SV and the originating datasets. Use limitations This Spatial View is available to Washingotn DNR users and those with access to the Washington State Uplands IMS site. The following cautions only apply to one-to-many and many-to-many spatial views! Use these in the metadata only if the SV is one-to-many or many-to-many. CAUTIONS: Area and Length Calculations: Use care when summarizing or totaling area or length calculations from spatial views with one-to-many or many-to-many relationships. One-to-many or many-to-many relationships between tabular and spatial data create multiple features in the same geometry. In other words, if there are two or more records in the table that correspond to the same feature (a single polygon, line or point), the spatial view will contain an identical copy of that feature's geometry for every corresponding record in the table. Area and length calculations should be performed carefully, to ensure they are not being exaggerated by including copies of the same feature's geometry. Symbolizing Spatial Features: Use care when symbolizing data in one-to-many or many-to-many spatial views. If there are multiple attributes tied to the same feature, symbolizing with a solid fill may mask other important features within the spatial view. This can be most commonly seen when symbolizing features based on a field with multiple table records. Labeling Spatial Features: Spatial views with one-to-many or many-to-many relationships may present duplicate labels for those features with multiple table records. This is because there are multiple features in the same geometry, and each one receives a label. Soils Metadata针对华盛顿州这类大范围区域，建议下载为文件地理数据库（file geodatabase）。此类针对华盛顿州的大型数据集，可能超出形状文件（shapefile）、Excel文件或KML文件的下载限制。若研究区域小于单个县域，可通过地图缩放至目标区域，并按需下载为形状文件、Excel或KML格式。 土壤（SOILS）数据层源自私有林地分级系统（Private Forest Land Grading System, PFLG）及后续土壤调查。PFLG是一项为期五年的制图项目，于1980年完成，旨在服务于林地税收征管，由华盛顿州税务局资助。美国农业部自然资源保护服务局（原土壤保护服务局，现更名为自然资源保护服务局（Natural Resources Conservation Service, NRCS））、美国农业部林务局、华盛顿州立大学与华盛顿州自然资源局（Department of Natural Resources, DNR）合作开展土壤制图工作，严格遵循全国土壤调查标准执行。 本次调查覆盖了具备商用林地承载潜力的私有土地，同时涵盖了穿插其中的少量州属土地、印第安部落土地及联邦土地。由于本项目属于合作土壤调查工程，部分调查区域同时包含了农业用地及非商用林地。华盛顿州自然资源局最初开发地理信息系统后，将数字化的土壤图单元界线与部分土壤属性导入该系统。后续剩余的PFLG土壤属性被补充至系统中，目前可通过关联查找表获取这些数据。此外，农业用地上的SCS（现NRCS）土壤数据也已被追加至该数据层。本土壤数据层涵盖约1100个镇区，其土壤数据已完成全部或部分数字化（完整覆盖华盛顿州需2101个镇区）。 具备商用林分承载潜力的州属与私有土地均纳入了调查范围，部分印第安部落土地及联邦土地同样接受了调查。由于本项目为合作土壤调查工程，部分调查区域内同时包含了农业用地与非商用林地。华盛顿州自然资源局最初开发地理信息系统时，将数字化的土壤要素界线与部分土壤属性导入系统。后续剩余的PFLG土壤属性被追加至系统中，目前可通过关联查找表获取相关数据。农业用地上的SCS土壤数据也已随后被加入本数据层。本数据层涵盖约1100个镇区，其土壤数据已完成全部或部分数字化（完整覆盖华盛顿州需2101个镇区）。 土壤视图（soils_sv）解决了一对多关系问题，属于特殊的“DNR”空间视图之一（即实现方式与要素类类似）。"SOILS_SV"与原始数据集的列名可能存在差异。 使用限制：本空间视图仅对华盛顿州DNR用户及可访问华盛顿州高地IMS站点的人员开放。以下注意事项仅适用于一对多或多对多空间视图！仅当该空间视图为一对多或多对多类型时，才可在元数据中使用下述内容。 注意事项： 1. 面积与长度计算：对一对多或多对多空间视图进行面积或长度汇总统计时需谨慎。表格数据与空间数据间的一对多或多对多关系会导致同一几何图形对应多个要素。换言之，若表格中有两条及以上记录对应同一要素（单个多边形、线或点），则空间视图将为表格中每条对应记录复制一份该要素的几何图形。进行面积与长度计算时需格外小心，避免因重复计入同一要素的几何图形而导致统计结果被夸大。 2. 空间要素符号化：对一对多或多对多空间视图中的数据进行符号化时需谨慎。若同一要素关联了多个属性，使用纯色填充进行符号化可能会掩盖空间视图内其他重要要素。该问题在基于包含多条表记录的字段进行要素符号化时最为常见。 3. 空间要素标注：一对多或多对多关系的空间视图可能会为存在多条表记录的要素生成重复标注。这是因为同一几何图形对应多个要素，每个要素都会获得一个标注。 土壤元数据（Soils Metadata）