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Messages - arjunkg96

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1
General / Alignment issue
« on: August 12, 2021, 10:19:49 PM »
Hello,
My data set consists of images of a straight lane of earth taken from a rover. The images are not geo-referenced. The alignment is all over the place and understandably so. In order to improve the alignment, I added 'fake' GPS data to the images. That is, starting with a gps coordinate, the successive frames were given GPS coordinates such that all the frames are in a single line. When I open the modified data set in Agisoft Metashape, the software recognizes this and shows that the images are perfectly in line (see attachment 1). But when I hit align cameras, the alignment is still very bad (see attachment 2).

Is there any way to tell agisoft software that the frames are roughly in a single lane, or is there any way to align properly based on the GPS data that I have given it?

Thanks,
Arjun

2
Thank you very much Paulo. Your support helped me get the task done!
Appreciate it very much.

3
Thank you Paulo,
Your edited code works. The problem is that we need to place the markers carefully and manually. But in my use case, I need to do this rotation completely in Python without manually interfering with it. So, instead of placing the markers manually, I was thinking of just extracting the coordinates of the 3 vertices out of the 8 in the Bounding Box (as shown in the picture). Using these three points as our markers (m1, m2, m3) we can use your script to perform the rotation.

I was able to extract the coordinates of the 8 vertices of the BBox, but I am not sure in what order they are as there is no information about that in the user manual. Could you please tell me how I can extract the coordinates of just these 3 points in Python? I just need the coordinates of the points in the same order as shown in the picture.

I hope you got why I am extracting these coordinates of the BBox, I want them to act as the m1, m2, m3 markers as per your previous solution because I want to automate this process.

Thank you very much for your help in this.

4
Thank you Paulo,
The transformation is running well but the result is that the recreated surface just flips and orients in a weird angle. Alternatively, I just found out that I can create DEM by using markers. I was able to place three markers and then create the DEM on the Metashape application by clicking on BuildDEM >> planar >> projection plane >>markers. That gives me the result that I want. But I want to do this in code, can you please tell me how I can achieve the following through Python script?:

I want to do this in python : build DEM with the following parameters: 1) Projection planar, projection plane: markers, vertical axis: point 1 -> point 2, source data: depth maps.

In the python manual, it does not specify where I can change the projection source and projection plane and even specify the vertical axis. So could you please tell me how I can use the buildDem() function with the parameters (listed above) written with the correct syntax?

Really appreciate your help. Thank you in advance!

5
Python and Java API / Align recreated surface with horizontal plane
« on: July 14, 2021, 12:50:46 AM »
Hello everyone,

I want to align the recreated surface with the horizontal plane so that I can create a DEM with 'Current view' (being the TOP VIEW). I can do this manually in the UI by simply rotating it and approximately setting the top view and the create DEM with current view. The challenge I am facing is to do this with the Python code so that I can automate it. I am very new to this, can somebody please tell me how I can align the recreated surface to a TOP VIEW through Python? So that I can then do chunk.buildDem() over that next.
My picture data is not geo referenced FYI.
Any help will be greatly appreciated.

Thank you in advance!

6
Python and Java API / Rotation of recreated surface
« on: July 13, 2021, 01:39:49 AM »
Hello,

I am trying to produce an orthomosaic image from my data set using the Python API. But before that, I would first like to rotate the model so that it is aligned with the XY plane before I build the orthomosaic. Can someone please tell me how to do this with Python?

Thank you.

7
Python and Java API / Re: Converting coordinates
« on: July 09, 2021, 09:09:45 PM »
This is what I was looking for. Thank you Paulo, thank you very much!

8
Python and Java API / Converting coordinates
« on: July 08, 2021, 06:18:55 PM »
Hello,

Given a 2D pixel coordinate on the orthomosaic, I want to do the following tasks:
- Convert it to world 2D coordinate
- project on DEM/model to gather Z coordinate
- reproject 3D point to source image
- get reprojection pixel coordinate on the source image (2D coordinates)

Could anyone please tell me how I can do these things with the Python API? My images are NOT geo referenced. I am doing this because I need a Python method to get the corresponding pixel coordinate on the source image given the coordinate on the ortho. I believe the above mentioned workflow is the way to do it.

Any help will be greatly appreciated.

Thank you.

9
Hello,

Thank you very much for your help. I am new to this and still figuring out the Python API. Could you please point me to the exact function calls I will need to use for the workflow you suggested? Or if there is a snippet of code which gets this done, could you please share that?

Your help will be greatly appreciated.

Thanks,
Arjun

10
Hello,
I have the final orthomosaic image. I want to do the following task:
- Given a pixel coordinate in the orthomosaic image, I want to find the corresponding pixel coordinate in the original raw image.
The images in my chunk are not georeferenced.

Any help will be greatly appreciated.

Thank you,
Arjun

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