---
title: "Research, explained | Nexus Observatory"
description: "Interactive explainer: science and research in 3D, chapter by chapter: price the data-year, not the box, seconds of warning, counted honestly…"
url: https://observatory.global/industries/research/explainer/
publisher: Nexus Observatory Inc.
updated: 2026-11-02
---

01 Gap-filling nodes 

Scientific · Sector explainer

# Data a referee will accept.

Field campaigns, seismology, hydrology, ocean, ecology, polar and research-infrastructure gap filling. Six scenes, each a working calculation: the cost of a valid data-year, earthquake warning time at a school, a stream-gauge rating curve, wave physics at a buoy, a recorder's storage and listening range, and the radio horizon of a quiet site.

**Scenarios**: 6
**Live calculations**: 6
**Community fit**: Strong

**01** Gap-filling nodes

**02** School seismographs

**03** Stream gauges

**04** Wave buoys

**05** Bioacoustics

**06** Polar and quiet sites

**07** Proof

**01** · Gap-filling nodes

Scenario

## Price the data-year, not the box.

Observatory-as-a-service for research infrastructures that must extend coverage under their own quality rules. The number that matters to a research infrastructure is the cost of one valid year of data: the capital cost spread over the service life plus the running cost, divided by the share of the year the record passes quality control. Coverage follows from spacing: a square lattice of spacing s needs area / s² nodes, and the mean distance from any point to its nearest node is 0.383 s.

**Cost per node-year**: 26.0 k
**Cost per valid data-year**: 27.4 k
**Nodes for the area**: 16
**Mean distance to the nearest node**: 19.1 km
**Network cost per year**: 416 k

**02** · School seismographs

Scenario

## Seconds of warning, counted honestly.

Compact seismographs feeding open data networks. In a typical crust the P wave travels at about 6.0 km/s and the damaging S wave at about 3.5 km/s. Each second between them puts the source about 8.4 km away, Vp·Vs/(Vp − Vs). Warning time at the school is the S-wave arrival less the time the nearest station needs to see the P wave and issue the alert; inside the blind zone, the shaking arrives first.

**P arrival at the school**: 11.8 s
**S arrival at the school**: 20.2 s
**S − P interval**: 8.4 s → 71 km
**Alert issued at**: 6.6 s
**Warning at the school**: 13.6 s
**Blind-zone radius**: 21 km

**03** · Stream gauges

Scenario

## Stage is measured. Flow is computed.

A low-cost tier beside national gauge networks. A gauge reads water level; discharge comes from the site's rating curve, Q = a (h − h₀)b, fitted to current-meter or ADCP gaugings. The exponent sets how stage error turns into flow error: a stage error δh gives a relative flow error of about b · δh / (h − h₀), which is why low flows need the most careful level sensor.

**Discharge**: 39.0 m³/s
**Effective depth h − h₀**: 1.40 m
**Flow error from stage error**: ±1.2 %
**Flow error at a tenth of this depth**: ±12 %

**04** · Wave buoys

Scenario

## A wave is a period and a height.

A low-cost wave buoy measures heave and reports significant height and period over satellite. Linear wave theory turns those into what engineers need: the dispersion relation ω² = g k tanh(k d) gives the wavelength at any depth (gT²/2π in deep water), and the energy flux per metre of crest is ρ g H² cg / 16, about 0.49 H² T kW/m in deep water. A short-burst satellite message carries up to 340 bytes.

**Wavelength**: 126 m
**Phase speed**: 14.0 m/s
**Regime (d / L)**: Intermediate depth · 0.48
**Wave energy flux**: 28.3 kW/m
**Messages per day**: 48
**Data per month**: 173 kB

**05** · Bioacoustics

Scenario

## Listen long, store wisely.

Open acoustic recorders for species baselines. Storage is sample rate times bit depth times the fraction of the day the recorder is on; the highest frequency recorded is half the sample rate, so bats need far more storage than birds. Listening range follows spherical spreading: a call is heard while its source level less 20 log r stays above the ambient noise by the detector's required signal-to-noise ratio. Air absorption and foliage shorten it further, most of all above 10 kHz.

Sample rate

Bit depth

Memory card

**Highest frequency recorded**: 24 kHz
**Storage per day**: 2.07 GB
**Days until the card is full**: 123 d
**Listening radius**: 178 m
**Area per recorder**: 9.9 ha

**06** · Polar and quiet sites

Scenario

## Free space never protects a telescope.

Autonomous stations with satellite backhaul in harsh environments. For a radio telescope the question is interference. Free-space loss, 20 log d + 20 log f + 32.44, is far too weak on its own: the distance it would take to bring a modest transmitter below a radio-astronomy protection level runs to hundreds of thousands of kilometres. What protects a site is the horizon and the terrain. With standard refraction the radio horizon between two antennas is about 4.12 (√h₁ + √h₂) km, heights in metres; a transmitter beyond it reaches the dish only by diffraction and scatter.

Observing frequency

**Free-space loss**: 131.0 dB
**Level at the feed, free space**: -84.0 dBm
**Above the protection level by**: 81.0 dB
**Radio horizon**: 46.7 km
**Transmitter position**: Beyond the horizon
**Free-space distance to reach the level**: 669,440 km

**07** · Proof

Evidence

## What a referee checks.

Research infrastructures accept a station when its data can be traced, read and cited. The grid keeps each piece of that evidence as a record beside the station it describes.

Show the record for

**Asked for**: Calibration traceability
**Record kept**: Calibration certificates and the reference chain to national standards, per sensor serial

**—** Proof

## What buyers in science ask to see.

The grid produces each item as a record with the data it supports, not a report written afterwards.

**01** Calibration traceability

**02** data-format conformance (netCDF/CF, FDSN, OGC SensorThings, WIS2)

**03** datasets with persistent identifiers

**04** uptime in harsh environments

**05** cost per data-year

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