Capturing a good dataset

[wz251]

Hi,
I'm currently out in the Alps trying to use terrestrial photography to create a DEM of a glacier.
So far the photos that I've taken haven't given me any good results on photoscan. Due to the nature of the environment, most of the photos are either looking up or down the slope at the glacier...
Is anyone able to advise a good technique of how to gather a good dataset in this scenario?
Many thanks

[ozbigben]

Climb higher than the glacier and shoot across it, but even then you'd need to go along both sides of the glacier for a good result

[David Cockey]

Make sure the photos are properly exposed with no clipping on the glacier. If the photos  bright areas are over-exposed then those areas will not have any information PhotoScan can use. Any areas of sky in the photos can be overexposed. Use the camera's histogram to help set exposures. If possible set the histogram to show separate RGB curves rather than a single white composite curve.