At a glance
Comparing observations from different times to identify changes in an area, feature or measured condition.
Why it matters
Change is often the signal that triggers a closer operational review.
An operating example
Compare imagery of a forest boundary or reservoir across dates, then investigate material differences.
Illustrative application, not a live customer result or a guarantee of product availability.
What it does and does not tell you
Sensor, season, illumination and cloud differences can create apparent changes that need validation.
Further reading
Primary references for the underlying concepts; the operating examples above are illustrative.