SoilWeb_spatial_query: Get SSURGO Data via Spatial Query
Description
Get SSURGO Data via Spatial Query to SoilWeb
Data are currently available from SoilWeb. These data are a snapshot of the
"official" data. The snapshot date is encoded in the "soilweb_last_update"
column in the function return value. Planned updates to this function will
include a switch to determine the data source: "official" data via USDA-NRCS
servers, or a "snapshot" via SoilWeb.