STUDIES OF ICE MOVEMENTS ON THE WARD HUNT ICE SHELF BY MEANS OF TRIANGULATION-TRILATERATION
ABSTRACT. A method is described by which accurate measurements of ice movements were performed on the Ward Hunt Ice Shelf at Ward Hunt Island. Geodimeter distance measure-ments and angular theodolite measurements were combined in a system of triangulation-trilateration in the form of a chain of quad...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.4574 http://pubs.aina.ucalgary.ca/arctic/Arctic19-4-337.pdf |
| Summary: | ABSTRACT. A method is described by which accurate measurements of ice movements were performed on the Ward Hunt Ice Shelf at Ward Hunt Island. Geodimeter distance measure-ments and angular theodolite measurements were combined in a system of triangulation-trilateration in the form of a chain of quadrilaterals to achieve relative positioning accuracies of r 1 to 2 cm. for the survey markers drilled into the shelf ice. Shelf ice movements of 30 cm. with respect to solid ground were obtained between 1964 and 1965. The relative position change between the markers on shelf ice was less than 4 cm. Experience on this first known arctic application of the geodimeter are reported. Rl?SUMe. Etudes des mouvements de la glace de la barrikre de Ward Hunt, au moyen de la Ctabli des mesures prkcises des mouvements de la glace sur la barrikre de 1’Ple de Ward Hunt. triangulation et de la trilatdralisation. Les auteurs dtcrivent une mCthode par laquelle ils ont 11s ont combink des mesures de distance au gkodimktre et des mesures angulaires au thtodolite en un systkme de triangulation et de trilatkralisation, sous forme d u n e chalne de tktragones, avec une prkcision de l’ordre de k 1 a 2 cm. dans la localisation relative des repkres forks dans la glace de la barriere. |
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