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Author Topic: Merging Chunks for Multispectral Datasets  (Read 1606 times)

ArnauCM

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Merging Chunks for Multispectral Datasets
« on: June 21, 2021, 12:06:11 PM »
Hello all,

I am working with a quite large study area where I have to perform several drone flights in order to cover everything with a multispectral camera.

Before each take-off I take a picture of a reflectance panel to later correct each flight radiometry.

I process each flight in a different chunk.

My doubt here is, if I merge the chunks, is the radiometric calibration kept for each batch?

If I were to process everything at once, can i group the cameras and apply different radiometric calibrations to different camera groups in the same chunk?

Thank you very much!

Alexey Pasumansky

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Re: Merging Chunks for Multispectral Datasets
« Reply #1 on: June 21, 2021, 01:16:41 PM »
Hello ArnauCM,

If you would like to have sub-sets of images be calibrated using different radiometric panel images, you need to split the calibration groups (via Tools Menu -> Camera Calibration dialog) so that each group contains the set of calibration images.
The easiest way is to add the images corresponding to each sub-set to separate chunks and then merge chunks before performing any processing operations - merged chunk will have the Calibration Groups split according to the original chunks.

Note, however, that inside each camera calibration group the interior orientation parameters would be estimated individually, so if you would like to keep them the same for the complete dataset, you may need to align and optimize the dataset using single calibration group and after that manually split the groups and perform the Reflectance Calibration operation.
Best regards,
Alexey Pasumansky,
Agisoft LLC