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Media literacy · Standards · 8 Sept 2026, 04:05 WAT

A satellite image can show change without proving who caused it

Resolution, acquisition time and sensor type limit what an overhead image can establish. Enlarging the picture does not remove those limits.

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A satellite image can provide valuable evidence of a changed landscape while leaving the cause unresolved. The view from above is a measurement with technical limits, not an all-seeing witness.

Spatial resolution is one of those limits. USGS lists most Landsat 8 and 9 optical bands at 30 metres, meaning each pixel represents a substantial area on the ground rather than an individual person or small object.

The same documentation identifies a 15-metre panchromatic band and thermal measurements acquired at coarser resolution. These distinctions show why the satellite name alone is insufficient to describe the detail in a particular image.

Enlarging a displayed image does not create observations that the sensor never collected. A smoother or sharper-looking presentation should not be mistaken for additional evidence about a small feature.

Time is equally important. A before-and-after comparison can constrain when a change occurred, but it does not necessarily identify the precise moment within the interval between acquisitions.

Interpretation must also distinguish observation from explanation. A visible damaged area may support a finding that change occurred while leaving responsibility, mechanism and the sequence of events open to other evidence.

A useful caption should therefore identify the source, acquisition date and relevant limitations. Readers should be able to tell whether they are seeing a natural-colour image, a processed composite or an annotated interpretation.

Satellite evidence is strongest when its limits are stated and it is combined with other information. The objective is a defensible conclusion about what can actually be observed, not the most dramatic claim an overhead picture can be made to suggest.

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The Africa News Desk follows verified developments across the continent, distinguishing confirmed facts from claims and explaining why events matter beyond the first alert.

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