The timing of when webcams capture data is critical to assess the time of the actual event. This is highlighted below. The four INGV cameras collected an image at 23:47 UTC on July 1, 2014 and an event was detected both in visible and IR data.
However, if we examine the University of Firenze webcam that has data continuously captured, and i have extracted it every 4 seconds, then the data shows the first detected signal at 23:56:55, or at least between 23:56:51 and 23:56:55. Therefore, the event could have started 5 - 8 seconds before the INGV captured data, even though these four cameras all show significant signals.
The shorter the time period between capture, the more likely one is able to capture the start of the event, but the larger the dataset and larger bandwidth required to get the data back from the volcano for use in hazard assessment.
Just some thoughts on how often data needs to be captured to record the event and what is the optimal temporal resolution, given event type, data collection, data size and remoteness of the volcano.
However, if we examine the University of Firenze webcam that has data continuously captured, and i have extracted it every 4 seconds, then the data shows the first detected signal at 23:56:55, or at least between 23:56:51 and 23:56:55. Therefore, the event could have started 5 - 8 seconds before the INGV captured data, even though these four cameras all show significant signals.
The shorter the time period between capture, the more likely one is able to capture the start of the event, but the larger the dataset and larger bandwidth required to get the data back from the volcano for use in hazard assessment.
Just some thoughts on how often data needs to be captured to record the event and what is the optimal temporal resolution, given event type, data collection, data size and remoteness of the volcano.
University of Firenze web, 23:56 - 23:58 UTC, July 1, 2014. Data every 4 secs.
INGV SPT, 23:57 UTC, July 1, 2014
INGV SPV, 23:57 UTC, July 1, 2014
INGV SQT, 23:57 UTC, July 1, 2014
INGV SPV, 23:57 UTC, July 1, 2014
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