Method, argument and the occasional correction. Written by the people building the software, for the officers and scientists who have to rely on it.
We had described HydroGeoSenZ as preserving the lunar M2 signal in hydraulic head data. Working through the Nyquist arithmetic against our actual RTDAS sampling — four transmissions a day — showed that it cannot.
Four observations per day provide a Nyquist frequency of 2.0 cycles/day. The semidiurnal lunar constituent M2 operates at a period of 12.42 hours (1.932 cycles/day). Under real field conditions, noise and irregular packet arrival induce phase folding and aliasing that render harmonic extraction unviable without continuous high-frequency burst logging.
Water table fluctuation and rainfall infiltration answer the same question from different evidence. Blending them destroys the disagreement, which is the most informative thing they produce.
The technical session given at the 9th India International Water Week: anomaly detection, noise suppression and predictive forecasting across a real-time groundwater monitoring network.
What a data-quality figure actually tells you about a national monitoring network, and why the right response is instrumentation rather than accusation.
Assessment categories travel through departmental submissions in black and white. Designing an ordinal palette that keeps its meaning when the hue is gone.
How a field capture form gets designed down rather than up, and why every field removed makes the resulting data more trustworthy rather than less.
The case for a consent-based water data exchange in which departments share without surrendering ownership of what they hold.
Have questions on our methodology, want to discuss an unpublished paper, or request raw telemetry datasets? Connect with the Nextent Labs scientific team.
Transforming Data into Actionable Insights