# Problem with the orthomosaic
**URL:** https://community.pix4d.com/t/problem-with-the-orthomosaic/17509
**Category:** General Ag Questions/Troubleshooting
**Created:** [April 8, 2021, 10:15pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509 "2021-04-08T22:15:51Z")
**Posts on this page:** 16
**Page:** 1
### Author:  [@lcaputo](https://community.pix4d.com/u/lcaputo)
#### Post date: [April 8, 2021, 10:15pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/1 "2021-04-08T22:15:51Z")
I have an issue in some of my last flights with the orthomosaic. I have some black shape appearing as you may see in the image. I was flying 120 meters and 70% overlap and 70% sidelap. What seems to be the problem?
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### Author:  [@Christina](https://community.pix4d.com/u/Christina)
#### Post date: [April 9, 2021, 7:43am UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/2 "2021-04-09T07:43:49Z")
Hello,
We would need more details to provide assistance in the most efficient way. Could you please send us the following?
▸ The quality report (.pdf format): …\project\_name\1\_initial\report\project\_name\_report.pdf
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### Author:  [@lcaputo](https://community.pix4d.com/u/lcaputo)
#### Post date: [April 9, 2021, 7:24pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/3 "2021-04-09T19:24:31Z")
I don’t understand. What I’m supposed to send?
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### Author:  [@lcaputo](https://community.pix4d.com/u/lcaputo)
#### Post date: [April 9, 2021, 9:15pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/4 "2021-04-09T21:15:01Z")
I don´t understand where the quality report is on Pix4dfields.
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### Author:  [@Nikoleta\_Dimopoulou](https://community.pix4d.com/u/Nikoleta_Dimopoulou)
#### Post date: [April 13, 2021, 9:26am UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/5 "2021-04-13T09:26:28Z")
Hi Lionel,
Regarding your issue, could you please look at the raw data and make sure that those black polygons are not in the original images taken from the drone or that dark series of pictures are not contained in your dataset?
Is there also a log file you could provide us with? Take a look at this article: [https://support.pix4d.com/hc/en-us/articles/360038793911](https://support.pix4d.com/hc/en-us/articles/360038793911)
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### Author:  [@lcaputo](https://community.pix4d.com/u/lcaputo)
#### Post date: [July 28, 2021, 8:45pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/6 "2021-07-28T20:45:35Z")
Hi, sorry for the delay. I still have the same problem. I confirm that those black polygons are not in the original images.
Maybe if I upload part of the images into a server and you could analyze yourself?
I´m uploading the flight I did today with the orthomosaic, the flight path and also de log file you ask for.
[215465f0-6d89-47ea-b062-e011bc47885a\_logfile.log](https://community.pix4d.com/uploads/short-url/4EIM2OFBJjwISL0S48nf0pzn2aG.log) (703.2 KB)
[applicationLog.log](https://community.pix4d.com/uploads/short-url/4xpJZ7VzH1fmvTKu3VdEkGjHSHC.log) (27.8 KB)
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### Author:  [@Fernanda\_Bosmediano](https://community.pix4d.com/u/Fernanda_Bosmediano)
#### Post date: [July 30, 2021, 1:07pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/7 "2021-07-30T13:07:37Z")
Did you collect nadir images? I see from the log file a message saying there
> Camera id 43 has large angle with nadir: 46.4079 degrees
Pix4Dfields supports only nadir images (\<35-degree orientation to the ground), maybe that is causing those artifacts. What happens when you process without radiometric correction? Could you please try to see if there is any difference?
Thanks
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### Author:  [@lcaputo](https://community.pix4d.com/u/lcaputo)
#### Post date: [July 30, 2021, 4:36pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/8 "2021-07-30T16:36:13Z")
Yes, I’m collecting nadir images. This is my plane, and the camera is mounted in nadir position.
Without radiometric correction those blacks shapes are gone but the color on the ortomosaic is very different.
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### Author:  [@Fernanda\_Bosmediano](https://community.pix4d.com/u/Fernanda_Bosmediano)
#### Post date: [July 30, 2021, 7:00pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/9 "2021-07-30T19:00:56Z")
Thanks for the information. You can send us the images and the log files of both projects when you process using radiometric correction and when you do not use radiometric correction. You can send the images here if you prefer, and if you do not have support&upgrade.
If you have support&upgrade you can share the images in a ticket to support.
If you send the images in a ticket to support please also add the link to this community post.
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### Author:  [@Fernanda\_Bosmediano](https://community.pix4d.com/u/Fernanda_Bosmediano)
#### Post date: [July 30, 2021, 7:02pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/10 "2021-07-30T19:02:52Z")
Also did you fly in a clear sky or overcast day?
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### Author:  [@lcaputo](https://community.pix4d.com/u/lcaputo)
#### Post date: [July 30, 2021, 7:22pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/12 "2021-07-30T19:22:32Z")
> [@Fernanda\_Bosmediano](#):
>
> Thanks for the information. You can send us the images and the log files of both projects when you process using radiometric correction and when you do not use radiometric correction. You can send the images here if you prefer, and if you do not have support&upgrade.
>
> If you have support&upgrade you can share the images in a ticket to support.
>
> If you send the images in a ticket to support please also add the link to this community post.
What a support & upgrade?
I´m sending you the log files with and without radiometric correction.
I have 17 GB of images I can´t send to you here.
[215465f0-6d89-47ea-b062-e011bc47885a\_logfile.log](https://community.pix4d.com/uploads/short-url/4EIM2OFBJjwISL0S48nf0pzn2aG.log) (703.2 KB)
[without radiometric correction.log](https://community.pix4d.com/uploads/short-url/dSktUzLHRWWGxposzhzq1nncsjU.log) (684.0 KB)
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### Author:  [@lcaputo](https://community.pix4d.com/u/lcaputo)
#### Post date: [July 30, 2021, 7:24pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/13 "2021-07-30T19:24:28Z")
> [@Fernanda\_Bosmediano](#):
>
> Also did you fly in a clear sky or overcast day?
It´s a mix between the two but mostly an overcast day.
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### Author:  [@lcaputo](https://community.pix4d.com/u/lcaputo)
#### Post date: [July 30, 2021, 7:28pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/14 "2021-07-30T19:28:12Z")
> [@Fernanda\_Bosmediano](#):
>
> Did you collect nadir images?
About that, I check with the log each time its say “large angle” is when the plane is turning at the end of each lane.
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### Author:  [@Fernanda\_Bosmediano](https://community.pix4d.com/u/Fernanda_Bosmediano)
#### Post date: [July 30, 2021, 7:30pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/15 "2021-07-30T19:30:39Z")
Okay would it be possible for you to capture a new dataset making sure you fly under clear sky or uniformly overcast? This way would be the best to check if there is an issue in the software or was mainly the dataset.
Or are you having this issue consistenly regarless of the weather condition?
From the information I receive until now, I think the issue is due to weather conditions. Capturing data on partly cloudy days with rolling clouds or changing weather conditions can lead to artifacts.
And thanks for the info about the large angle!
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### Author:  [@lcaputo](https://community.pix4d.com/u/lcaputo)
#### Post date: [July 30, 2021, 7:44pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/16 "2021-07-30T19:44:35Z")
> [@Fernanda\_Bosmediano](#):
>
> Or are you having this issue consistenly regarless of the weather condition?
Yes, I´m having constantly this problem. The first time it happens it was on September 2020. The dataset prior to that was on July 2020 when I flow 5 different days with 0 problems. I don´t know is something change with the program between those dates.
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### Author:  [@Fernanda\_Bosmediano](https://community.pix4d.com/u/Fernanda_Bosmediano)
#### Post date: [July 30, 2021, 7:53pm UTC](https://community.pix4d.com/t/problem-with-the-orthomosaic/17509/17 "2021-07-30T19:53:29Z")
I see. Could you please share a dataset that you took in clear sky or overcast conditions and where you see these issues? With those images, we can replicate the issue, and understand it.
Thanks so much