Validate camera rotation

sstcam / sstcam_nsb

Issue tracking and script storage for SSTCAM investigations of night sky background

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Validate camera rotation #6

Closed STSpencer closed 3 years ago

STSpencer commented 3 years ago

It's entirely possible the rotation of the camera in the current scripts is wrong.

[x] Run nsb ~20 mins later on Eta Carinae field to do star tracking.

STSpencer commented 3 years ago

Looks out to me. After 20 minutes same stars in field rotate counter clockwise.

Same field after 20 minutes:

But in the camera pixel intensities, the bright pixels move clockwise.

After 20 minutes:

This suggests to me that the pixel intensity values are 90 degrees out from what we want in the pixel extractor.

STSpencer commented 3 years ago

Alright, this has been fixed by the latest commit. The problem stemmed from that the fov_lat and fov_lon attributes aren't inherited by the ctapipe EngineeringCameraFrame class as they are in the CameraFrame class. However, using the CameraFrame results with a rotation matrix gets consistent results with those from the EngineeringCameraFrame:

This appears consistent with both the field of view nsb images, and the rotation after 20 minutes appears to be correct too:

Now onto units.