Know your data sources.

California State Lands Commission — coastal tidelands + offshore O&G + School Lands + Granted Lands. - searchOffshoreLeases ⭐ ~34 polygons (Active 26 / Inactive 8) — Long Beach/Wilmington/Huntington - searchOnshoreLeases ⭐ ~5.5K leases (76 Oil & Gas). Defaults TypeofLease='Oil & Gas Lease' - searchSchoolLands ~1.3K PLSS polygons (CNTY field, NOT COUNTY) - searchGrantedLands ~115 tidelands grants. Active 105 / Repealed 4 upstream quirks: AGOL services3.arcgis.com/5aaQCuq3e4GRvkFG owned by CA_State_Lands_Commission. Offshore lean schema (PRC + Lease_Stat only). CSLC Leases use ISO date strings + Lat/Lon strings + geometry.x/y. School_Lands has CNTY (4-char), 'Tinity'->'Trinity' typo. Granted_Lands COUNTY has 'Marin'/'Marin County' variants.

Pan-EU harmonized offshore oil & gas — OGC WFS 2.0.0, no auth. 18 EU countries (Croatia, Cyprus, Denmark, Faroe Islands, France, Germany, Greece, Ireland, Italy, Latvia, Malta, Montenegro, Netherlands, Norway, Poland, Portugal, Spain, UK). Annual refresh — breadth filler; prefer sodir/nsta for authoritative national data. Layers: - hydrocarbons (~28.5K wells) ⭐ status/purpose/content/country filters - platforms (~1.6K) ⭐ currentStatus/category/primaryProduction - pipelines (~3.9K) ⭐ medium/status/country - activelicenses (~1.3K polygons) type/country

Australian Commonwealth offshore petroleum wells and seismic surveys (NOPTA / NOPSEMA). Find wells in Carnarvon/Browse/Bonaparte/Otway/Gippsland basins, search 2D and 3D seismic survey footprints. Production volumes not included — permanently confidential under Australian Regulations 8.02(3)/10.02(3). CC-BY 4.0.

Norwegian Continental Shelf (NCS) open data — 9,765 wellbores, 142 fields, 645 discoveries, 1,809 licences, 82 pipelines, 1,215 facilities, 5,008 seismic surveys. - searchWellbores ⭐ operator/status/purpose/content/field/area/date - getWellbore ⭐ by name (e.g. '33/12-1') or NPDID - searchFields ⭐ Producing/Approved for production/Shut down - searchDiscoveries ⭐ status, HC type, operator, year range - searchLicences ACTIVE/INACTIVE polygons - searchPipelines medium (OIL/GAS), phase, facility - searchFacilities platforms, FPSOs, subsea — kind/phase - searchSeismicSurveys 2D/3D/4D acquisition areas - getWellboreFormationTops lithostratigraphy per wellbore - getWellboreDST drill stem tests per wellbore - getFieldReserves oil/gas/NGL/condensate reserves (multi-vintage)

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.