Project combining archived/old and modern photographs

[lvargo13]

Hello,

I'm working on a project hoping to use old photos of a glacier to look at changes in it's size. I've also taken ~100 photos of the glacier this past year from a small plane (which are georeferenced with GCPs and with geotagged images from a GPS in the plane). 

I can successfully create a model of the glacier using photos from this year (2016). However, when I mask the ice from the 2016 photos and then include the old photos during alignment, no points from the old photos are included in the point cloud (despite used/blue points being shown on the photos (shown in attached images)).

I'm wondering if anyone knows why the aligned points shown in the old photos do not become part of the point cloud or the model. Or if anyone has suggestions for a workflow that may be more successful. I've tried the alignment with and without GCPs, with and without then image locations, and working with the 2016 and old photos in separate chunks and 1 chunk.

I've attached several photos- the generated point cloud, and 2 examples of old photos after alignment (with the used and unused points shown).

Thanks for any suggestions

[lvargo13]

Update- I've discovered that the problem is that the old photographs aren't aligning with the others. I'm going to try manual alignment by placing markers using the workflow outlined here http://www.agisoft.ru/w/index.php?title=PhotoScan/Tips_and_Tricks

[torstensand@yahoo.com]

.