Gridded Soil Survey Geographic Database (gSSURGO)

This dataset is called the Gridded SSURGO (gSSURGO) Database and is derived from the Soil Survey Geographic (SSURGO) Database. SSURGO is generally the most detailed level of soil geographic data developed by the National Cooperative Soil Survey (NCSS) in accordance with NCSS mapping standards. The tabular data represent the soil attributes, and are derived from properties and characteristics stored in the National Soil Information System (NASIS). The gSSURGO data were prepared by merging traditional SSURGO digital vector map and tabular data into State-wide extents, and adding a State-wide gridded map layer derived from the vector, plus a new value added look up (valu) table containing "ready to map" attributes. The gridded map layer is offered in an ArcGIS file geodatabase raster format. The raster and vector map data have a State-wide extent. The raster map data have a 10 meter cell size that approximates the vector polygons in an Albers Equal Area projection. Each cell (and polygon) is linked to a map unit identifier called the map unit key. A unique map unit key is used to link to raster cells and polygons to attribute tables, including the new value added look up (valu) table that contains additional derived data. The value added look up (valu) table contains attribute data summarized to the map unit level using best practice generalization methods intended to meet the needs of most users. The generalization methods include map unit component weighted averages and percent of the map unit meeting a given criteria. Resources in this dataset:Resource Title: gSSURGO downloads Page. File Name: Web Page, url: https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/geo/?cid=nrcs142p2_053628#value Download gSSURGO Databases Other resources include introduction to gSSURGO, User Guide (PDF; 4.22 MB), SSURGO/gSSURGO ArcTools, Valu1 (Value Added Look Up) Table, Metadata, Recommended Data Citations, Technical Information, Sample gSSURGO Map Themes本数据集被称为格网化SSURGO数据库（gSSURGO），其源于土壤调查地理数据库（SSURGO）。SSURGO通常是国家合作土壤调查（NCSS）依据NCSS制图标准所开发的土壤地理数据的最详细级别。表格数据反映了土壤属性，并源自于国家土壤信息系统（NASIS）中存储的属性和特征。gSSURGO数据通过将传统的SSURGO数字矢量地图和表格数据合并至州级范围，并添加一个由矢量数据派生的州级格网地图层，以及包含“可供制图”属性的新增查找表（valu）而制备。格网地图层以ArcGIS文件地理数据库栅格格式提供。栅格和矢量地图数据具有州级范围。栅格地图数据具有10米单元格大小，近似于Albers等面积投影中的矢量多边形。每个单元格（和多边形）都与一个称为图单元标识符的地图单元键相链接。一个独特的地图单元键用于将栅格单元格和多边形链接至属性表，包括包含额外派生数据的新增查找表（valu）。新增查找表（valu）包含将属性数据汇总至图单元级别的数据，使用旨在满足大多数用户需求的最佳实践概括方法。概括方法包括图单元组成部分加权平均值和满足特定标准图单元的百分比。本数据集包含的资源包括：资源标题：gSSURGO下载页面，文件名：网页，URL：https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/geo/?cid=nrcs142p2_053628#value 下载gSSURGO数据库。其他资源包括gSSURGO简介、用户指南（PDF；4.22 MB）、SSURGO/gSSURGO ArcTools、Valu1（价值增加查找表）、元数据、推荐数据引用、技术信息、样本gSSURGO地图主题。

搜集汇总

背景与挑战

背景概述

Gridded Soil Survey Geographic Database (gSSURGO) 是由美国农业部自然资源保护服务发布的土壤地理数据集，基于SSURGO数据库开发，提供州级范围的栅格地图层（10米分辨率）和表格数据，包含即用属性以支持土壤分析和地图制作。该数据集覆盖美国及其领土，适用于环境研究、地理信息系统应用和土壤调查，具有公开访问和CC0许可证的特点。