[Landsat-pds] Estimated lag-time between USGS and AWS

[Amit Kapadia]

Hi Robert,

For Tier 1 data we poll USGS once per day. We used to poll twice per day,
but found that they tend to release one large batch each day rather than a
continuous stream. For RT data we continue to poll twice per day.

We've observed a high variance in when T1 data becomes available. It can
range between 0 - 20 days due to, I believe, lunar models that are made
available on a roughly bi-weekly interval.

Those are two sources of latency. To your question, I've run on the
assumption that as soon as a scene is made available through EarthExplorer,
it's also made available through USGS's API. This might not be the case as
demonstrated by the example scene you shared. I've poked the USGS API, and
it does appear it will be queued for ingestion later today. I'll keep an
eye on it as there might be problem on our end.

Thanks for reaching out.

Amit

On Tue, Jun 13, 2017 at 10:54 AM, Robert Hildebrand <
robert_hildebrand at trimble.com> wrote:

> Hello,
>
> I am wondering if there is a known time gap between when Tier 1 collection
> data is available via the USGS and when it is subsequently replicated into
> AWS.
>
> As of 2017-06-13, the most recent Tier 1 data is from 2017-05-23.
>
> The Real Time data is replicated into AWS much faster - the most recent RT
> data is from 2017-06-12.
>
> Here is an example of Tier 1 data that is available via the USGS, but has
> not been replicated into AWS: https://earthexplorer.
> usgs.gov/metadata/12864/LC81370412017161LGN00/
>
> Thank you for any timing information that you can provide.
>
>
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>
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