JPL Close Approach vs USGS Water Services
Same instrument, two spec sheets — measured, not claimed.
JPL Close Approach vs USGS Water Services: common questions
Which is more reliable, JPL Close Approach or USGS Water Services?
On our scheduled checks, JPL Close Approach leads on measured uptime — JPL Close Approach at 98.0% versus USGS Water Services at 87.3% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, JPL Close Approach or USGS Water Services?
JPL Close Approach has the lower median latency in our checks — JPL Close Approach responds in 676 ms versus USGS Water Services at 828 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
Do JPL Close Approach and USGS Water Services need an API key?
Neither needs a paid key — JPL Close Approach is callable with no signup, and USGS Water Services is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call JPL Close Approach and USGS Water Services from the browser?
Only USGS Water Services is browser-friendly — it returns CORS headers over HTTPS. JPL Close Approach needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are JPL Close Approach and USGS Water Services free for commercial use?
JPL Close Approach has unclear commercial terms, and USGS Water Services allows commercial use on its free tier. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.