SAR Coherence Stack
Provided by 
Interferometric coherence answers a question no optical index can: did the physical arrangement of this surface stay the same between two dates? A parked car park, a roof, a road, these stay coherent for years. A ploughed field, a flooded plain, a demolished building, a new excavation, these lose coherence instantly. Coherence is therefore a change detector that is indifferent to cloud, to darkness, and to seasonal greening that fools NDVI.
The service computes coherence for every pair in a co-registered stack, then derives the products that make it usable: a mean coherence map showing what is permanently stable, a coherence change map flagging where stability broke and when, and per-pixel time series. Because the measurement is relative, it works without any training data and without a labelled baseline.
New construction, demolition, flood under cloud, deforestation confirmation, urban stability and crop harvest tracking all read the same underlying signal.
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