29.07.2019: Knut Rasmussen Glacier

Glacier Survey

Karel, a scientist from the university in Prague and Louisa, a young student from Cottbus are visiting on board. They both plan to take a survey on the Rasmussen Glacier. Louisa has written an entry for the logbook:

We went ashore close to the outflow of the Knut Rasmussen Glacier and started the measurement program. Our plan was to take a photogrammetric measurement. We first had to unpack the parts of the drone which had been packed so carefully for the flight and put them together. The light aircraft from E-bee is made of Styrofoam and has a propeller and two wings operated by two servo drives. In its core there are a lot electronics, for example for the wind measurement and a GPS or optical sensors used for the landing. There is also a battery and a camera inside. A satellite photo was put on file as a reference point, but this did not correspond with the actual coordinates.

A flight plan was made according to the photos taken. The area of the glacier was to be flown over in widths – the direction and the height were preset. In addition a position for the landing had to be determined, which is not easy considering the rock field of the moraine. The light aircraft takes off from Karel’s hand and receives a signal from a radio modem. The flight lasts about an hour and a half during which around 160 photos are taken over an area of 2km x 500m. About three hours later a second fly over is undertaken. This is to document the movement of the glacier. We returned to the “Dagmar Aaen” after completing the fly overs. The many pictures will serve to calculate a digital terrain model. A pix4d program is used to first show a scatter plot. With the use of both terrain models, it is possible to calculate the shift at different points. As expected the speed in the middle of the glacier is much higher than on the edges. A precise analysis will follow after our return.



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Friday, 1. June 2018