USGS Water Data API

OGC-compliant interfaces to USGS water data. Provides access to hydrologic monitoring data including continuous (instantaneous) values, daily values, field measurements, and monitoring location metadata. Key features: - Access water data from thousands of monitoring locations across the US - Query continuous (sub-hourly) sensor data - Retrieve daily statistical summaries (min, max, mean) - Look up monitoring location metadata - Reference data: parameter codes, statistic codes, states, counties, HUCs Data collections include: - monitoring-locations: Site information and metadata - continuous: High-frequency sensor data (typically 15-minute intervals) - daily: Daily statistical values - latest-continuous: Most recent observations - latest-daily: Most recent daily values - field-measurements: Manual field measurements - parameter-codes: Reference for parameter codes (pcode) - statistic-codes: Reference for statistic codes - states, counties, hydrologic-unit-codes: Geographic reference data