The extreme weather events and resulting destruction that have hit New Zealand this summer are not only signs of a changing climate. They also highlight the now indispensable role of remote sensing satellite technology.

Broadly, remote sensing involves gathering information about Earth from a distance – most often from satellites equipped with sensors that measure different forms of electromagnetic energy.

Operating across multiple wavelengths, these instruments can function at night and capture conditions over large areas in a single pass. Synthetic aperture radar (SAR) satellites detect ground movement and flood extent even during heavy rain and thick cloud.

Optical sensors capture detailed imagery showing building damage, blocked roads, sediment plumes and coastal change. Thermal sensors identify heat patterns and temperature anomalies that signal hotspots or stressed environments.

Together, these systems provide a reliable, real-time picture of ground conditions, especially when severe weather renders traditional monitoring impossible.

But despite this technological progress, the framework that controls access to satellite data is alarmingly fragile, leaving a disaster-prone country like New Zealand vulnerable.

Better emergency response and risk mapping

For affected communities, satellite sensing technologies can be transformative. When rivers overflow, bridges collapse and extreme weather prevents response teams from entering affected areas, satellites continue operating........

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