Google Earthearth.google.com
3D globe with high-resolution satellite imagery, 3D buildings and terrain. The desktop Pro version adds historical imagery, which you need for change-over-time analysis.
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tools / esri-wayback
Esri World Imagery Wayback
Archive of every published version of Esri's World Imagery basemap since 2014. Compare high-resolution satellite snapshots side by side to see when local changes happened.
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Turn on "only versions with local changes" to skip redundant releases and jump straight to the dates when the imagery for your area actually changed.
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