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Author Topic: Aligning orthomosaics of field taken with different cameras  (Read 1056 times)

jf-willow

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I have RGB camera, modified NIR camera, and RedEdge sensors. I want to use images taken with these devices and generate orthomosaics that all line up with each other, without GCP. I landed on the following workflow:

  • Create separate chunks for each camera/sensor
  • Import all photos to their relevant chunks and perform reflectance calibration if needed
  • In each chunk, align photos using "Workflow > Align Photos..."
  • Align chunks using "Workflow > Align Chunks," selecting all chunks in the prompt
  • Generate orthomosaics for each chunk

This works when simply performing the operation with 2 devices (i.e., using 2 chunks such as RGB & RedEdge or RGB & NIR). With all three chunks, this procedure fails. Most of the time, after aligning the chunks in step 4, one of the chunks in my workspace loses its [T] or [R] label, which to my knowledge suggests something happened to alignment information (I then need to re-align before I'm allowed to create a DEM). One time, the alignment did not go away, however the orthomosaics were not aligned well like had been the case with only 2 chunks.

Is there a better workflow for what I'm trying to accomplish, or is there something I'm doing wrong here?
« Last Edit: June 29, 2018, 09:23:35 PM by jf-willow »

Alexey Pasumansky

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Re: Aligning orthomosaics of field taken with different cameras
« Reply #1 on: July 01, 2018, 05:04:22 PM »
Hello jf-willow,

Do you use all sensors (RGB, NIR cameras and RedEdge) simultaneously on the same aircraft to cover the same area, or each sensor is utilized during a separate flight?
Best regards,
Alexey Pasumansky,
Agisoft LLC

jf-willow

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Re: Aligning orthomosaics of field taken with different cameras
« Reply #2 on: July 02, 2018, 03:06:14 PM »
The RedEdge mounts on a fixed position on the aircraft while RGB and NIR plug into the gimbal. This means we have a minimum of two flights to capture footage with all three cameras. The first flight is usually RedEdge+RGB, the second NIR. All three captures follow the same mission flight.