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Data/Event Type | Average Latency (between start time and when it appears in Skylight) |
|---|---|
AIS positions & Last Known Position | Majority within minutes (see here for more detail) |
Entry Events | 1 hour |
Standard Rendezvous | 1 hour |
Vessel Detections from Night Lights | 2 hours |
Vessel Detections from Sentinel-1 Satellite Radar | 3-6 hours |
Vessel Detections from Sentinel-2 Optical Imagery | 3-6 hours |
Dark Rendezvous | 4 hours |
Fishing | 6 hours |
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Spire’s AIS feed is not always real-time . The majority of messages are received particularly when collected by their satellite receivers. For their whole feed (including terrestrial data), 99% of data comes within minutes/under an hour, but some messages can be received hours later. 1 hour. However when we look at data from satellite receivers, a significant amount (>30%) is received more than 1 hour later.
Below is more detail provided by from Spire as of March 2024 . Below statistics use about messages picked up by their satellite receivers, using an arbitrary time interval (20-27 February, 2024) , and looking at latency between timestamp and our ingestion time.
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99.74% are transmitted within a day
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0.26% of messages are delivered between 1-2 days latency and no message is delivered later than 2 days in this time frame.
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Median latency was 45 minutes & 95th percentile
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was under 4 hours.
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