Analysis

• Stereoscopic interpretation
• Measuring of surface points
• 3-D modeling

Stereoscopic interpretation

• The stereoscopic interpretation of the glacier surface was done with an optical mirror stereoscope using the enlarged paper prints from the f = 500 mm photography.
• Additionally, all natural breaklines and visual discontinuities caused by occlusions were identified stereoscopically.

Measuring of surface points

• The selected surface batches were digitized as tringles using a digital stereo comparator program called "TKK Kuvamittaus". This was done from relatively oriented image pairs which were rectified to the normal case of stereo. The parallax measurements were transformed to 3-D model coordinates.

3-D modeling

• The object model was built as a 3-D TIN model based directly on the measured model coordinates. The TIN models were produced using the TargetJr.