Know your data sources.

NOAA CO-OPS — water levels, tide predictions, currents, coastal met. No auth. - searchStations ⭐ NWLON 301 + tidepredictions 3.4K / currentpredictions 4.4K / historicwl 2.9K / watertemp / met / harcon - getStation (expand: datums | sensors | harcon | products) - getWaterLevels ⭐ observed (preliminary + verified). 31-day cap. - getTidePredictions ⭐ hi/lo (365d) or 6-min (31d) / hourly (365d). - getMeteorological ⭐ wind / air_temperature / water_temperature / air_pressure - getServiceInfo upstream quirks: HTTP 200 + body {error:{message}} on bad input — check body. 3 response shapes (water_level, predictions, currents_predictions). Datums product removed — discover via mdapi expand. Long-period stations only support hourly_height/high_low; Great Lakes accepts IGLD.

Texas General Land Office state lands. No auth. O&G: searchActiveLeases (~7.3K) ⭐ royalties+primary-term dates, getExpiringLeases ⭐ acquisition feed, searchInactiveLeases (~12K), getLeaseDetail, searchLeaseUnits, searchPSFLands (~21.9K), searchEasements, searchOffshoreStructures, getNominatedTracts. Coastal/land: searchUplandLeases, searchSubmergedTracts (~11K), searchBeachAccess, searchCoastalLeases (~9.2K), searchStateAgencyLands, searchNavigationDistricts, searchPriorityHabitatAreas, searchEsiShoreline (~48K lines), searchInSituBurnExclusion + boundary getters (Coastal Zone, 3-league/3-mile lines, Dispersant Zone, lease polygons). getServiceInfo for schemas. Quirks: MM/DD/YYYY string dates; most non-lease layers have no COUNTY column; ESI/boundary layers return line geometry.