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MONITORING RAPIDLY EVOLVING LANDSCAPE FEATURES USING GROUND-BASED TIME-LAPSE PHOTOGRAPHY : A CASE STUDY FOR A PROGLACIAL ICING

Two automated time-lapse cameras were set up to monitor the summer decay of the proglacial icing associated with Fountain Glacier. A series of photos were retrieved from each camera after two months. Initial determination of the camera orientation parameters was carried out using single photo resections. However variations in camera positions caused by melting of the surficial layers of permafrost meant that orientation parameters needed to be determined separately for each photograph. Final camera orientations were achieved by assuming the camera positions remained fixed and using twin reference points to adjust the rotational parameters. After successful determination of the camera parameters, a time series of orthoimages was generated from each camera location. These were subsequently used to obtain estimates of the rate of ice melt over the summer. * Corresponding author