aerial images placed beneath model after alignment

[jeremyeastwood]

I have a set of georeferenced drone images (https://www.dropbox.com/s/0om9ixa32z94mv0/images.zip?dl=0) that stitch together nicely, however when aligned, they place the dense cloud (and model etc.) location above the images rather than below:

https://www.dropbox.com/s/g0wnl68xorhyzf4/Screenshot%202015-03-23%2012.05.34.png?dl=0

which leads to the georeferenced orthophoto having the wrong scale and not aligning properly with satellite imagery after export.

Is there a way I can force photoscan to always have the images pointing downwards, or flip the dense cloud / model if it appears above them?

Thanks

[Alexey Pasumansky]

Hello Jeremy,

I think that the problem is in low GPS accuracy - coordinates of all cameras are realated to the almost the same point in space.

[jeremyeastwood]

Hi Alexey,

Thanks for the quick replay as always.  Yup, I thought similar, but get the same result when repeating alignment with pair selection disabled - I guess it's disregarding the gps locations (as they're so inaccurate), and guessing an alignment direction.  If this does occur, is there a way of flipping the model (ideally through the console) so the ortho scales correctly?

Jeremy

[Alexey Pasumansky]

Hello Jeremy,

Since the camera cooridnates are present in the Reference pane, they are used for the model georeferencing irrespectively to the preselection method used. Reference preselection only chooses the paris of potentially overlapping images according to the input coordinates.