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Messages - jguan

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General / Re: Issue of orthophoto with DJI Phantom4 Multispectral
« on: February 25, 2021, 12:23:00 PM »
Hello Alexey,

There are always these alternately spaced ribbons on the orthophoto in each channel of the camera, this does not seem to be a problem of adjusting the brightness.

Through the NDVI image, we can see the problem more clearly in the attachment.

By the way, what kind of additional adjustment can we apply after using Raster Calculator?

Thanks a lot.


General / Re: Issue of orthophoto with DJI Phantom4 Multispectral
« on: February 24, 2021, 08:07:15 PM »
Thanks for your reply.

We have tried with this new version beta. And please find the orthophoto generated in the attachment.

Seems like there is always this problem.  More details in the second image.

Do you have any research about it?

Best regards.



General / Issue of orthophoto with DJI Phantom4 Multispectral
« on: February 23, 2021, 02:04:07 PM »
Hi everyone,

Since March 2020, we have started to use Agisoft Metashape Pro to generate multi-spectral orthophoto with the photos taken by DJI Phantom4 Multispectral.

There are at least one hundred orthophotos that have been generated, in most of these orthophotos, we have found this problem (see the attachment): There are alternately spaced ribbons on the orthophoto, and are consistent with the drone's flight path. It seems that more camera calibration may be needed. But there doesn't exist a panel calibration for this drone.

Does anyone else encounter the same problem, is there any good solution?

Thanks a lot.


Camera Calibration / calibration reflectance for camera MultiSPEC-4C
« on: February 23, 2021, 01:01:43 PM »
Hi everyone,

We try to align some photos taken by camera MultiSPEC-4C with Agisoft Metashape Pro 1.7.1.

But we met some problems when we want to calibrate reflectance, actually, we don't have a CSV file with calibration information.

Does anyone know where can I find these factors reflectance for this camera? We have only a calibration target in the box of the camera.

Thanks a lot.



I met the same problem when I want to change the master channel with script Python.

After reading the Python API Reference, I think they change the name of the index Chunk.master_channel by Chunk.primary_channel if you use the version Photoscan 1.4.0+.

 And the index type int for default is -1 indicated in the API Reference.

But I failed to change the master channel by setting the value of Chunk.primary_channel.

Waiting for the reponse of support team Agisoft.


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