approach to
ic distortion,
a. Regional
Proc. of the
temporal and
synthesis, R.
STEREOSCOPIC COMPUTER MEASUREMENTS OF MULTY-TIME IMAGES FOR
INVESTIGATION OF MOUNTAIN GLACIER MOVEMENTS
prof. Yu. F. Knizhnikov, R. N. Gelman
Moscow State University by M.V.Lomonosov,
Geographic Faculty,
Laboratory of Aerospace Methods.
Commission V, Working Group V/III
KEY WORDS : Geography, Monitoring, Photography, Digital, Stereoscopic, Scanner Photography
Stereoscopic, Different Time Photograms, Glacier Movement Measurement.
Abstract
The paper deals with the method intended for ice
movement velocity determination of mountainous
glaciers. It is based upon measurement of different
time aerial photos. As only contact prints of the
aerial photograms were available for researchers the
version based on digital photogrammetry and
relatively simple equipment has been chosen and
developed. Processing results have shown that
glacier movement could be estimated with sufficient
accuracy and without using expensive
photogrammetric plotters by using the suggested
technique.
Introduction
Application of digital photogrammetry to study
dynamical parameters of glaciers has not yet
obtained wide representation in technical literature.
As one of only a few examples, a paper on
unsynchronized aerial photograms useg for ground
shifts measurements, and glaciological objects in
particular, may be mentioned (Crippen, 1992).
Several methods for determination of surficial
velocity of glacier movement based on quasi-
Stereoscopic effect have been developed in the
Moscow University Geographical Faculty,
Laboratory of Aerospace Methods, following widely
known Finsterwalder work (Finsterwalder, 1958).
The most universal one known as the "Method of
Horizontal Vectors" and is shown in the paper along
with computeraided technique for repeated aerial
photo processing made for Pamir glacier Medvezhy.
This method provides for the daily detection of ice
movement velocity and photogrammetric modeling
to geometrically represent the glacier surface.The
process is founded on relatively simple and widely
distributed equipment and contact prints of aerial
photos. It was considered that such data is often
available for glaciologists and as such the use of
299
high precision measuring devices is not prachcable.
Otherwise, as it was correctly mentioned in
literature, for example (Klaver, 1993) precision and
cost of the measuring system are interrelated
parameters, therefore a significant decrease in the
working cost takes place if precision is limited to
an acceptable minimum.
General grounds of the method
Fig.1. Geometric scheme of the method of the
movement velocity measurement. Stereopairs of
simultaneous aerrial photograms L1-R1 and different
time photograms L1-R2 were used.The model
koordinate system and the photos orientation
elements are shown.
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996