swathcast · Delivery

How long until a Sentinel-1 acquisition is downloadable?

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Latency = hours from sensing start until this repo's hourly poller first found the granule at the source (±1 h). Not-yet-seen granules are right-censored, not dropped; quantiles come from a Kaplan–Meier curve. "—" means the curve has not reached that quantile yet.

Cumulative availability

Fraction of acquisitions downloadable by t hours after sensing (Kaplan–Meier; log time axis). Hover for values.

Platform

Trend: monthly median latency

Median of each sensing month's Kaplan–Meier curve, per source. Months with fewer than 20 sightings are omitted.

By platform and month

Every stratum with its sample size; the view behind the charts.

Source

Latest granules (last 24 h)

Granules sighted anywhere in the last 24 hours, and where they have arrived. Cells are hours after sensing; "…" = not yet seen.

Product Platform Search

Provider timestamps vs first seen

Each provider's own timestamp is recorded as a cross-check only. Positive = our poller saw it after the provider's timestamp. See docs/sources.md.

OPERA: first burst vs last burst

OPERA products are per burst. The headline number is the first burst of an acquisition; this is when the last new burst arrived (counted once no new burst has appeared for 24 h).

Poller health

Each source fails independently. A source failing for more than 24 h fails the hourly job.

Definitions and caveats

Tracking universe: Every IW GRDH and IW SLC product ESA's Copernicus Data Space Ecosystem publishes (the _COG duplicates excluded). Other sources are checked for those exact granules by identifier; nothing is sampled.
Available: The first hourly poll that finds the granule at that source. One definition for every source, accurate to about ±1 h. A source faster than CDSE cannot be distinguished from CDSE.
Censoring and timeouts: A granule not yet seen is right-censored at its last check. After the timeout (14 days by default) it counts as not delivered, and "% not delivered" is 1 − F(timeout); it is shown only once some granules have been followed that long.
Partial-coverage sources: Planetary Computer and OPERA do not cover every acquisition. For them, only granules in orbit cells (track × 1-minute along-orbit bin) where the source has delivered at least once are counted.
Excluded rows: Granules first listed long after CDSE published them (the first run, or after an outage) and sightings that followed a poller gap of more than 3 h are excluded from the statistics; the counts are in the summary table's tooltip.
Not measured: Fewer than 20 sightings. No number is ever taken from documentation.