Sentinel-2 Clear Days

Sentinel-2 Clear Days finds the cloud-free days over a place you care about, builds a timeline you can scrub, and exports a short film. Go back to 1984 with Landsat, zoom in with US aerial imagery, and see your area in 3D. Draw or drop an area on the map, search for a place, or use a preset such as Starbase, Colossus or Cape Canaveral. Scan public Sentinel-2 L2A imagery for clear dates, review cloud, shadow and granule stats, build a timeline, play it at 1–12 frames per second, and export a film that matches that preview speed. Optional inlay box or circle and MGRS or lat/long burn-in on composed frames. Features • Area and inlay tools (box or circle) on Apple Maps • Place search and km-sized drop presets • Clear-day scan across the Sentinel-2 era, the last year or the last 45 days • 1984 to present: long timelines use Landsat 5, 7, 8 and 9 for the early years • NAIP aerial imagery (0.6–1 m) for areas in the lower 48 US states • 3D terrain on Copernicus 30 m elevation, with a north arrow, height exaggeration, and share or save as an image • Saved 3D views that reopen without a connection • Timeline scrub, play speed, and film export • Optimized for iPhone Duo • On-device stacks: no account, no sign-in, no backend Data: Sentinel-2 L2A imagery comes from the public Element84 Earth Search STAC API and Cloud-Optimized GeoTIFFs on AWS. Landsat (USGS) and NAIP (USDA) imagery come from Microsoft Planetary Computer. Elevation comes from the Copernicus DEM (30 m). Place search may use OpenStreetMap Nominatim, and the basemap uses Apple MapKit.