Laser scans component moving position when combined with images

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    Ondrej Trhan CR

    Hi ScanningAHS, when you imported the laser scan data, did you imported it as georeferenced in correct coordinate system? Do you have this system set as Project coordinate system?

    Are you using a component workflow or did you just imported images to the project?

    Do you have some GCPs in this project?

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    ScanningAHS

    Thanks for the quick response

    "when you imported the laser scan data, did you imported it as georeferenced in correct coordinate system? Do you have this system set as Project coordinate system?"

    I have the project coordinate system as local:1 Euclidean and the output coordinate system as my required coordinates.

    I've tested by meshing the laser scan data without adding any images, when I export that using the same coordinate system I imported it with it lines up with a pointcloud thats not been through RC. Its only once adding images that the position gets shifted slightly out of place.

    "Are you using a component workflow or did you just imported images to the project?"

    I've tried both ways with the image sets to see if that would make any difference but I was getting the same results either way.

    "Do you have some GCPs in this project?"

    I had control points in the image component when using the component workflow. I did a test just importing the images directly and then aligning, that had no control points. It didn't seem to make a difference.

     

     

     

     

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    Ondrej Trhan CR

    Can you try to import the laser scans also with set correct coordinate system, not as local and as georeferenced?

    By GCPs I though CPs with coordinates, which are placed over laser scan's dataset and also image's dataset.

    Is it possible to share part of your data for testing?

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    ScanningAHS

    Hi Ondrej,

    I've tried aligning with both the project coordinates and the output coordinates as my required coordinate system, this hasn't fixed the issue.

    Just to make sure I'm not missing anything in the settings these are what I'm using:

    Laser scan:


    Drone images:


    I've not used any control points as the data all aligns well, the final component looks accurate, however its just in the wrong location on the grid. It shouldn't make a difference if the scans are locked anyway right?

    "use camera priors for georeferencing" is set to yes in the alignment settings

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    Ondrej Trhan CR

    Hi, it seems good for me. Is it the same, if there is set Lock pose for continue as No? Also, if you set Position and orientation and not Locked?

    As I wrote, can you share part of your data with us to test?

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    ScanningAHS

    Hi, do you have an email that I can send the data to? If so I can send over an e57 of the scanned area and drone images

    thanks

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    Ondrej Trhan CR

    Yes, you can send it to trhond@capturingreality.com

    One more thing, when you compare Prior pose and Registration pose of the component, is it the same? When you are exporting the mesh/point cloud, do you have set there the correct coordinate system?

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    ScanningAHS

    Thanks, I'll get the data sent over to you

    Coordinate export should be correct, I've verified it by exporting a model generated from the laser scan before adding any images and it was in the correct position.

    Had a look at one of the scan positions in the combined component, this is how it looks:

     

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    Ondrej Trhan CR

    Will wait for the data.

    According to the attached screen shot it seems that the coordinates are the same. So it seems, there will be some issue with export.

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