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Messages - Mr.Vain

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1
Hello Mr. Vain,

The projected coordinates in SWEref99 12 are correct. As X camera coordinate are around 149 000 m which is around 11.99 longitude. So its is not a problem with your RTK coordinates as photos were taken every second and there are big gaps in position. For example fotos 7, 8 and 9 were taken every second but distance between 8 and 9 is way greater  then 7 to 8...

If you can share the image dataset, I could have a look at it   :)

Of course i can, here it is https://www.dropbox.com/t/pki1MvNhP1gaA2Ei Thanks!

2
Hello Mr.Vain,

Seems like the coordinate information for the cameras is incorrect, which leads to the alignment issues.

You can try to align the images from scratch having the cameras unchecked in the Reference pane and apply the coordinates after alignment is completed - and you should see very big errors on camera locations.
For me is seems that coordinates are assigned to improper cameras (like 5 cameras shift between actual coordinate assignment and correct one).

Thanks! I see that now, missed it. it should be 7 digits in the X coordinate but its only 6 before the decimal. Could you see why that has happend?

Just tried it but everything seems to be at the wrong place and when importing the gcp:s the wont even show. When looking at the coordinates for the pictures all pictures seems to have the correct coordinates, do we need to take new photos or am i missing something?

3
Hello Mr.Vain,

Seems like the coordinate information for the cameras is incorrect, which leads to the alignment issues.

You can try to align the images from scratch having the cameras unchecked in the Reference pane and apply the coordinates after alignment is completed - and you should see very big errors on camera locations.
For me is seems that coordinates are assigned to improper cameras (like 5 cameras shift between actual coordinate assignment and correct one).

Thanks! I see that now, missed it. it should be 7 digits in the X coordinate but its only 6 before the decimal. Could you see why that has happend?

4
Hello Mr.Vain,

Can you share the screenshots of Initial and Adjusted tabs from the Camera Calibration dialog?

If possible, please also share problematic project with the alignment results (in PSZ format) to support@agisoft.com.

Thanks for a quick answer, here is a link to the PSZ file https://www.dropbox.com/t/cxpeaVugew9BsaTJ and the screenshots is attached in this reply :).

5
Hello forum, hoping someone can help me out here.
I have a flight with our Matrice300RTK with P1 camera and 35mm lens. When i look at the pictures the look the same as all other hundreds flights we have done so everything looks great. RTK data looks fine, flight height also looks great comparint to our gcps. BUT, after aligning phothos the result is really poor. Aligning eith highest will give med just some photos aligned and using loweat will aling all of them but i always get the sparse cloud at minus 500m. It does not matter what i do, what am i missing here?? This looks like it should work like its an ordinary day at work but now i have tried fixing this for a lot of hours without any succes, Posting ascreenshot also with results and settings.

Have a nice day :)

6
Sorry this is not the tab, the second tab from source tab gives errors for each camera, marker in East, North and Altitude....


Aha, here is a new screenshot

7
Hello Mr.Vain,

definitely I would say there is an accuracy offset between your GCPs and camera positions. From the accuracy, it seems the camera positions were RTK fixed (cm level accuracy). Where they determined from same base as GCPs? And maybe you can can show the error tab in reference pane to see how errors are distributed...


Thanks for your answer. Here is a screendump with error showing and the project is optimized without using the pics.

8
Hi forum!

I have a big problem, its because i dont really understand whats happpening så it would be great if someone can axplain it to me. We are using a matrice 300 with P1 camera and when computing projects we get different results. We always use gcp:s so we know that the data should be correct but we get wrong data.

First i align the photos and place the gcps:s. When i do "optimize" i do this with all pics unchecked and just gcp:s checked. This usually gives me an error of 0.005 or soemthing, really good. But if i look at the errors of the pics they could get errors up to 1m and when checking the cloud to the gcp.s we get big differences and really poor accuracy. What does really happen when i uncheck all pics and just have the gcp:s checked? Why do i get that  big errors on the pics?

If i align and then do the optimize with both pics and gcp:s checked i get more bad accuracy on the gcp:s but much better error on the pics. AND the cloud is getting much more correct. Is this the way to compute, with both gcp:s and pics checked when optimizing?

I must also say that i had experiences when using both pics and gcp:s checked and had really bad result becasuse of big error on pics and when unchecking them helped. Can someone please explain to me how this works and what workflow that should be used, i cant understand it.

I will attach 2 screenshots here also with optimized checked and not checked.

Thanks!

9
General / Re: Photos messing up alignment, how to fix?
« on: April 08, 2023, 08:46:32 AM »
Solved it, just unchecked "Load camera accuracy....." and then i could use only the gcp:s :).



10
General / Photos messing up alignment, how to fix?
« on: April 06, 2023, 04:24:01 PM »
Hi all.

i have got a big problem here. We are using a Matrice300RTK drone and get really nice photos. The last 6  projects we noticed that we got warnings about the writing to the SD-card but nothing more. When importing the photos in Agisoft and doing aling somthing really strange happens. The spars cloud gets really messy i all ways and when importing my gcps its not even near and i cant fix it. Even that we got RTK-data in the pics it dont help. Any ideas how i can fix this, is there any way i can use the photos without the RTK data and how do i do that? Will add a screenshot here in the post.

11
Hi Mr. Vain,

what is strange on your bad project is that camera accuracy is all set to default which is 10m. If the data was correctly RTK corrected then accuracy should be at cm level and this accuracy should be read from XMP meta `data (as long as you have set this option in preferences > Advanced tab). By having such loose accuracy, your camera positions are not so constrained and the 1 m error shows some inconsistency between camera positions and GCPs.... Maybe you can show the reference errorrs window (View errors button) to see how this error is distributed between X,Y and Z ....

For your good project what was the final f adjusted value (from camear calibrarion window)? and what was the f adjusted value for bad project?

Thank you so much!!!!! I replaced the computer 1.5 months ago and reinstalled metashape and after that i have not made that setting. I have totally missed that one, dont ask me how.....I checked other project computed with the same settings and they are ok but not perfect. As long as i have used GCP:s around the area of intrerest the result have been ok there but with the project now i was looking a bit from the gcp.s and the result was no good at all wich the usually are. Again, thank you so much :).

12
Hi forum!

This is really strange, i seem to have a big issue with camera errors. I dont really know what all numbers means but if i compare them to earlier projects from late 2022 its a big difference. Today i saw that i had quit big differences in height when comparing to earlier flights, 25cm as the biggest. I am using a DJI Matrice 300RTK with a P1 camera so i get really good pictures and the gcp:s are measured with trimble R12i gps with really good accuracy and still i get a really poor result. When looking at older flights with the same drone i have perfect result and the estimated error in the reference cameras is as highest 10cm for only 1 pic and then its from 3cm down to millimeters for the rest. Looking at my latest flights its now from 2m error for the worst pics and 70cm for the best! After the alignment of the pictures i import the GCP:s and the are not spot on my ground markings, the are 5-10cm of and they used to be spot in since the RTK on the drone always is good. What am i missing here? I really hope someone can help med because this is a BIG problem for me right now. I will attach 2 screendumps also, one with a project wich is good from december 2022 and one from a flight a couple of days ago so you can see the difference.

Have a good day! :)

13
General / Mesh gets strange, what am i doing wrong?
« on: December 05, 2022, 08:35:44 PM »
Hi!

After updating i must have changed something in my settings when creating a mesh but i can figure out what settings. Before my update i did not get many holes even if i had some trees in the cloud and the edges of the mesh was not like it is now, like a wall. I have tried a lot of diffrent settings but i get the same. Anbybody have a idea of what settings to use for creating the mesh to avoid getting holes and a wall at the edge?


14
General / DJI MINI2, distortion in cloud, what am i doing wrong?
« on: March 29, 2022, 08:56:22 PM »
Hi all!

We did another test with using photos from our mavic mini 2 but this time i get this (pic attatched), points everywhere after the alignment. Last time i used photos from the mini it worked quite well but now i must be doing something wrong and i cant understand why. Anybodu knows why?

15
General / Phantom 4 RTK - how to use pictures when flight without RTK?
« on: October 26, 2021, 01:09:29 PM »
Hi!

Probably this is a easy question but i cant figure it out. Sometimes when we fly we loose RTK connection in the air when flying and then it connect again and sometimes we fly a whole flight without RTK. I dont know why this happens but it does.
Anyway, when i try to use this pictures in Agisoft i get a really big error when using my GCP:s. How can i get arround this? It seems like it is something in the metadata wich is telling Agisoft that the accuracy should be like RTK but it isnt. Can anyone give me a workflow of how to do this?

Have a nice day! 


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