U.S. public soil-data systems

This inventory distinguishes databases, programmatic services, downloads, sensor networks, applications, and related environmental context.

Survey and modeled products

Source	Kind and value	Relationship / status
SSURGO	Detailed mapped survey polygons and tabular attributes	Underlies the first supported SDA adapter.
STATSGO2	Generalized national soil map	Broader, less detailed survey mapping; planned research.
gSSURGO	Gridded/package form of SSURGO	Derivative, not an independent observation source.
gNATSGO	Composite of SSURGO, STATSGO2, and Raster Soil Surveys	Planned raster research; label source composition.
Raster Soil Surveys	Predictive digital soil mapping products	Researching access, version, and uncertainty.
SOLUS	Continuous modeled national soil-property rasters at multiple depths	Planned after core observed/survey adapters.

Profiles, taxonomy, and carbon

Source	Kind and value	OpenSoil priority
NCSS Lab Data Mart	Measured pedon/horizon laboratory characterization	2 — planned.
Official Soil Series Descriptions	Typical profiles, settings, drainage, and associated soils	3 — planned readable/taxonomic context.
Soil Series Classification database	Current series taxonomy, status, and geographic use	3 — planned with OSD.
RaCA	National organic/inorganic carbon profile samples	7 — planned research.
Dynamic Soil Properties for Soil Health	Management-responsive physical/biological attributes	Researching dataset structure and terms.
NRI / LUCID Public	Statistical land-resource estimates; exact sample locations confidential	Aggregate context only; never infer hidden point locations.

Sensors and time series

Source	Kind and value	OpenSoil priority
SCAN / Tribal SCAN / AWDB	Soil moisture and temperature at multiple depths plus weather	4 — planned. Preserve station, sensor, depth, timestamp, flags, and timezone.
Henry Mount database	Soil temperature/water observations from NRCS networks	Researching relationship with AWDB and export paths.
NEON soil data and sensors	Standardized chemistry, biology, physical samples, and continuous sensors	8 — planned after U.S. core sources.
AmeriFlux	Ecosystem flux sites with supporting soil moisture/temperature	Related environmental context; variable site fields and terms.

Geochemistry, forest, and research

Source	Kind and value	OpenSoil priority
USGS Geochemical Data Portal / NGDB	Observed soil, sediment, rock, and mineral chemistry; crucial for trace elements	5 — planned. Keep sample media distinct.
National soil geochemical surveys	Low-density measured elemental/mineralogical soil samples	Research alongside USGS portal releases.
FIADB / EVALIDator	Forest inventory, biomass/carbon, and selected soil indicators	9 — planned. Separate measured and modeled fields.
UNSODA	Measured hydraulic functions and related soil properties	Researching release structure and citation.
AgCROS, GRACEnet, REAP, SHAnet, LTAR	Agricultural experiments, carbon, greenhouse gases, health, and management	Dataset-by-dataset research; no single uniform adapter assumption.
POLARIS	Modeled 30 m probabilistic CONUS property maps	Researching access, model version, depths, and uncertainty.

Environmental site context

EPA SEMS, RCRAInfo, ACRES, Cleanups in My Community, EnviroFacts, and EnviroAtlas can identify regulated or cleanup sites and environmental layers. These are not clean nationwide soil-test databases. Any future OpenSoil integration will use a separate contamination/site-context model and will not mix program status with soil measurements.

Interfaces that are not new databases

Web Soil Survey and SoilWeb primarily expose USDA-NCSS survey data. NASIS is the internal authoring system. Soil Data Mart is the published database and SDA is its programmatic interface. Catalog and adapter design must avoid counting these layers as independent scientific evidence.