Process Oblique Images

PIX4Dmapper PIX4Dmapper Questions/Troubleshooting
1

Hi,
First off all, Happy new year for all.

For many years I use to process “Nadiral Images / Vertical Images” and in most of the cases I did not have many problems with this. In the end of the last year I had to process Oblique images without EXIF / Coordinates from the image center so I would like to if there´s someone that can help me with.

1 - In the process: The workflow is the same?
2 - Has we know the oblique images has more distortion, there is a way to reduce it?
3 - Do I have to use more GCP´s than the normal?
4 - Do I have to do more overlapping between the images?

I think that there is a lot of thing that I did not write , but if it is important please share with me.
It is a new topic to me so I have many doubts .

Drone: Ricopter
Cameras: SONY Alpha 6000

Best Regards,
Paulo Martinho.

2

Hi :wink:

Here are the answers. Let us know in case something is not clear enough.

1
It won’t be the same as for the nadir flight. For example, if the object you’re going to reconstruct is a building you should use the 3D Model template instead of the 3D Maps.
2
To not be concerned about the distortion, you should first calibrate the camera so the software will know how to undistort images and use them for processing correctly.
How to calibrate a Perspective Lens Camera
How to calibrate a Fisheye Lens Camera
3
Yes, I assume that with images without geolocation, you would need to add more MTPs. How to add / import and mark manual tie points (MTPs) in the rayCloud
4
That would definitely help calibrate the images. Please take a look at our article on Image acquisition.

Cheers!