ground control

[Pascal]

Hello,
first, thank you for your great software, we work on archaeology and we use very often dense photogrammetry in our work. We have the professional version of photoscan in order to be able to use the ground control features of the software.  But we have a little problem, very often archaeologists do not have a tacheometer to take X Y Z measurements, they use only levels and decameters so they measure only distances and altitudes (Z) of several points on the excavation. This is sufficient to scale and 'Z adjust' our 3D models in order to produce usable ortho images for precise drawing of the excavation. In photoscan, if I understand, we need al the coordinates for the markers points (XY and Z ) to scale and orient the 3D model so in a majority of our studies we cannot use this feature. May be you could help us on this point ?  We use a third software to scale and correctly adjust the model in Z but it can be very boring when the tools are not appropriate. Giving more flexibility (adding markers with data in Z only, and distances between markers) to the gound control module of photoscan (conserving the ability to combine with x y z data) could be a good thing as we do not need perfectly georeferenced model all the time.
Thank you.
Pascal

[zView]

+1,

I propose to split the markers into three different types:

1. XYZ marker
2. XY marker
3. Z marker

Thanks,

[Pascal]

Thank you Zview, several Z markers and one or several associated distance scales would be sufficient.
But this thread doesn't not passionate people nor developers...

 

[Pascal]

Hello,
not an exciting problem apparently ...
I would appreciate to have a word from the developers.
We encountered this situation very often in our work, It seems not to be crazy to permit
local geo referencing with only a 'scale bar' and three or more Z only markers.
I tried with the last version of PS leaving the X and Y field at 0 but, as expected, it does not work.
I hope you will take some seconds to say me what you are thinking about this.
Thanks.
Pascal 
   

[Alexey Pasumansky]

Hello Pascal,

We have some similar requests already, but implementing plane/vertical markers is not currently in our short-list of features, so unfortunately, it would not be implemented in version 1.1 release.

[Pascal]

Hello,
ok Alexey, thank you for your answer, I hope you'll do not forget us in the next version ;-)
Regards.
Pascal