Automatic Marker Detection

[Joel Cast]

Hello, I would like to create GCPs that would allow me to use the automatic GCP detection feature because the red-orange Xs painted on the ground seem to be absolutely ineffective. I still rely on the old-fashioned way of manually designing them one by one. I would like to speed up the process. I've seen AprilTags on the internet, but it seems that Agisoft does not support them. What would be the most effective way to create GCPs that could be automatically recognized by the software? Please note that this is for large-scale land surveying, so the small printable coded targets from Agisoft probably cannot be considered. Are there surveyors who use the automatic detection function in some way? If yes, with what type of target: X, black and white square, black and white circle?

Thanks!

[BenW22]

Hi Joel,

I have very good sucess with the GCP metashape recommends -  "non-coded cross" target. Mine are 300mm x 300mm and work very well for flights up to 100m AGL (see photo attached). I'm using a M300 and Zenmuse P1 camera. Do a google search for "Metashape Coded targets and Scale bars" . They have written a document on it.  When i was testing them I just printed them on paper and glued them to cardboard. But now have had some made out of aluminum with matt finish to minimize sun glare.

It took me a while to get the process right and several questions to metashape support. But works about 98% of the time now.

Might also help you to search questions on this forum about "non-coded targets" - I have posted afew trying to get the process right.

It saves me so much time every time I process a flight.

Hope this helps.

Regards
Ben