Earthframe

Two dates. One city.

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Acquisitions

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Starters show broad, visually reviewed Sentinel observations. Other places and Check archive search the past five years automatically: approximately 10 km windows, Sentinel-2, scene-cloud prefilter 20%, at most 120 acquisitions or two minutes. The automatic pair uses dates at least 30 days apart.

Sentinel RGB resolves 10 m. Fit shows the whole footprint at a size bounded by native samples and the provider PNG; zoom stops at that limit. Background outside the image is not imagery. Alignment uses an approximate geographic aspect.

Complete native SCL and raw red/green/blue coverage are required, and every displayed alpha pixel must be opaque. SCL cast shadows and unclassified cells are distinct from cloud flags. At most 0.1% of the buffered native SCL cells may be labelled cloud, cloud shadow or cirrus. Exact saved frames were visually reviewed for clouds, haze and exposure; automatically selected archive frames receive only coverage and severe-exposure checks. Neither screen can guarantee physically cloudless skies.

Zero values in a stretched display-color channel are not proof that a raw scientific band is missing. Display RGB is not calibrated reflectance. Dates differ seasonally. Illumination and provider stretches affect color; RGB appearance does not establish a cause or measure environmental change.

Place search: Open-Meteo / GeoNames.