Knowledge
Each source has a page with its publisher, update schedule, coverage, known limits, and request fields. Coverage tells you where a source is available, not which fields a property will return. You can get the same details as JSON at /api/knowledge/data-sources.
Last verified . That is when this list was last rebuilt from the ParcelOps source registry, not when each publisher last refreshed its own data.
Sample one lower-48 point from the verified 30 m MRLC NLCD 2021 WMS layer.
Where US solar farms and wind turbines are already built, from two USGS national databases.
USGS streamflow, stage, site, daily-value, water-quality, and groundwater observations.
