Copying active fires

[bnordgren]

Carl,

Tell me if my understanding of the following is correct:

viirs_activefire_2_fireevents exists to copy all of the active fires from a particular satellite timestamp from the active_fire table to the fire_events table. In the process, it reprojects the points. Additionally, it assigns each active fire point to an existing collection or creates a new collection, setting the last_update field appropriately.

The threshold for assimilating points into an existing collection is the same as the specified spatiotemporal thresholds.

I started this thinking that there was a way to simplify, but I think I talked myself out of it now.

[calbury]

Yes,
You are correct. I need to go back and look at the “documentation”, I don’t think I documented the db functions very well.
There is the “check_for_activity” that happens first. Active_fire/thresholded pixels can only be added to an active event. Otherwise a new collection is created (for active_fire) or the pixel is ignored (thresholded)

One thing to be aware of is that I’m using the same temporal threshold to:

•      Determine if a collection is still active
  

•      Determine if a thresholded pixel is valid
  

  Users might want to be able to use different thresholds for these cases.

[Forest Service Shield]

Carl Albury
Remote Sensing Specialist

Forest Service Contractor
Remote Sensing Applications Center

p: 801-975-3351
[e-mail]:[e-mail]

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From: bnordgren [mailto:[e-mail]]
Sent: Thursday, February 18, 2016 1:35 PM
To: firelab/viirs_ba [e-mail]
Subject: [viirs_ba] Copying active fires (#8)

Carl,

Tell me if my understanding of the following is correct:

viirs_activefire_2_fireevents exists to copy all of the active fires from a particular satellite timestamp from the active_fire table to the fire_events table. In the process, it reprojects the points. Additionally, it assigns each active fire point to an existing collection or creates a new collection, setting the last_update field appropriately.

The threshold for assimilating points into an existing collection is the same as the specified spatiotemporal thresholds.

I started this thinking that there was a way to simplify, but I think I talked myself out of it now.

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