Satellite Imagery Availability
Every satellite pass over SW Montana — clear days, cloudy days, and everything in between.
We query four collections on
Microsoft's Planetary Computer:
Sentinel-2 L2A (10m, native), Landsat 8/9 C2 (30m), and the harmonized HLS-S30 + HLS-L30 (30m).
HLS is often
fresher than the native collections because Microsoft sometimes lags ingesting new scenes.
AOI: -112.2, 44.9 to -109.0, 46.5 — 12 Sentinel-2 tiles for full coverage.
The "Why" column explains what each pass means in plain English.
Show:
All Passes
Excellent
Good+
Usable (any)
Cloudy Only
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Sentinel-2 Passes
Every Sentinel-2 pass over the AOI. One row per date.
The "Products Available" column shows which processed versions exist:
L2A = native Sentinel-2 L2A (10m, ESA's processor) or
HLS-S30 = NASA's harmonized 30m product.
These are not two separate passes — they're the same observation processed
differently. We query both because Microsoft sometimes ingests HLS faster than native L2A.
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Landsat Passes
Every Landsat 8/9 pass over the AOI. One row per date.
L2-C2 = native Landsat Collection 2 L2 (30m) and
HLS-L30 = NASA's harmonized version of the same observation.
Landsat has a 16-day revisit per satellite, ~8 days combined for L8+L9.
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