I am building a google calendar system to inform users in Sardinia, in a timely nature, of the dates for which Sentinel-2 data has been acquired. Try it out here:
(there’s also a webext to insert the quicklooks into the event descriptions)
I do this by querying the data-hubs. Generally, Sentinel-2 products arrive in the data hubs within a week or so of Sensing Time.
During that week a planned acquisition remains in limbo, either:
- all goes well and the products eventually arrive or
- there is some rare event and the absence hangs on.
That acquisition are planned can be derived from the acquisition plans posted a fortnight or so in advance (in machine readable XML) here:
Planned absences can be inferred where ever an item (Placemark) does not indicate NOBS mode. This takes some work to do this but I now have working code.
However, the ongoing absence of data from
Sentinel-2B Relative Orbit 065 for 10:20 UTC on 22 May 2019
doesn’t seem to have been announced in any acquisition plan,e.g. here:
https://sentinel.esa.int/documents/247904/3690955/Sentinel-2B_MP_ACQ_KML_20190516T120000_20190603T150000.kml
An alternative indication of this absence is given on the ESA News site:
https://earth.esa.int/web/sentinel/news/
– in a less machine-interrogable form. The relevant article is:
https://earth.esa.int/web/sentinel/news/-/asset_publisher/xR9e/content/id/3814873
But that indicates the downtime was planned be over an hour or so before the aforementioned missing products.
Q:
Since things can understandably go awry after plans and news get published
I ask is there a definitive expiry period after which one can be pretty sure that
the absence of a product is permanent?
Or perhaps there is another source of information which I am missing?