Tab. 6+7: Altitudes and variations of altitudes in the area of the Filchner and Neumayer Stations

The determination of the strain and velocity behaviour of the ice surface near the two German Antarctic Stations on Filchner/Ronne and Ekström ice shelves was performed by the use of various geodetic measuring techniques. The relative positions and heights of control points valid for reference data...

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Bibliographic Details
Main Authors: Lindner, Klaus, Ritter, Bernhard
Format: Dataset
Language:English
Published: PANGAEA 1985
Subjects:
AWI_stations
AWI Antarctic Land Expedition
DATE/TIME
Dronning Maud Land
Antarctica
Event label
Filchner Ronne Ice Shelf
Filchner-Schelfeis Expedition 1980/81
Filchner-Station
FSE81
Height
Neumayer
OBSE
Observation
Polarsirkel
Research station
RS
Sample code/label
WMO89002
Antarctic
Ronne Ice Shelf
Antarc*
Filchner-Ronne Ice Shelf
Ice Shelf
Ice Shelves
Polarforschung
Schelfeis*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.761578
https://doi.org/10.1594/PANGAEA.761578
Description
Summary:The determination of the strain and velocity behaviour of the ice surface near the two German Antarctic Stations on Filchner/Ronne and Ekström ice shelves was performed by the use of various geodetic measuring techniques. The relative positions and heights of control points valid for reference data were deduced from terrestrial observations (horizontal and vertical angle selectro optical distances). After a second sampling of data, these values served as the basis for the deformation analyses. Doppler-Satellite-observations (Navy Navigation Satellite System) made absolute positioning (latitude, longitude, height) of special points possible. These Doppler observations, supported by azimuth measurements (gyro-theodolite and sun observations) provided the datum of control networks (translations and orientation). After the repetition of these observations, the drift rates and azimuths of the control points as wenas the rotanon rates of the surface elements could be given. From vertical angles and horizontal distances differences in height end refraction coefficients were calculated. On days without clouds the refraction coefflcients increased by arnounts of up to 3.0 (in extreme cases up to 5.0). Distances over 1 km have to be subdivided to reach a standard deviation level of an heigh: difference better than 0.05 m. In order to determine the heterögeneity of refraction, some height differences should be measured with higher accuracy end-by subdivision of distances.

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