Script for batch adjustment of all z values?

[kcrob0401]

Hi there,

I have over 3000 deep-sea images, all taken from 2000+ metres depth. They are exif stamped but their altitude exif stamps are positive, I.e. all images have an altitude of 2000+ metres. Is there a code to batch adjust all z values to negative, I.e. multiply all z values by -1?

Any help would be appreciated,

Thanks,

Karl

[Photo]

Hi,

yes, you can use here the "piexif" Python library to achieve this.
Here is a python script to batch, and i hope i could help you.

Code: [Select]

import piexif
import os

def adjust_altitude(image_path):

    exif_dict = piexif.load(image_path)
   

    if piexif.GPSIFD.GPSAltitude in exif_dict["GPS"]:
        altitude = exif_dict["GPS"][piexif.GPSIFD.GPSAltitude]
       

        adjusted_altitude = (altitude[0] * -1, altitude[1])
       

        exif_dict["GPS"][piexif.GPSIFD.GPSAltitude] = adjusted_altitude
       
   
        exif_bytes = piexif.dump(exif_dict)
        piexif.insert(exif_bytes, image_path)

def batch_adjust_altitudes(directory):
    for filename in os.listdir(directory):
        if filename.lower().endswith(('.png', '.jpg', '.jpeg')):
            adjust_altitude(os.path.join(directory, filename))


batch_adjust_altitudes('path')

Replace 'path' with the path to the directory containing your images.
and you have to install the piexif library.


Best Regard
Photo

[kcrob0401]

Hi Photo,


Thanks for that. I managed to find a code that works within the Agisoft console,


Code:
import Metashape

# Define the altitude adjustment factor (multiply by -1)
altitude_adjustment_factor = -1.0

# Access the current open project
doc = Metashape.app.document

# Loop through all the chunks in the project
for chunk in doc.chunks:
    # Loop through all the cameras in the chunk
    for camera in chunk.cameras:
        # Check if the camera is part of the "Downward_looking" group
        if "Downward_looking" in camera.group.label:
            if not camera.reference.location:
                continue  # Skip cameras without location data

            # Get the camera's location data
            location = camera.reference.location
            # Adjust altitude by multiplying by -1
            location.z *= altitude_adjustment_factor

            # Update the camera's location
            camera.reference.location = location

# Save the modified project
doc.save()

print("Altitude adjustment complete.")