THE ROLE OF STEREOSCOPIC AEROSPACE IMAGES IN INVESTIGATION AND MAPPING GEOGRAPHICAL PHENOMENA DYNAMICS
Yu. F. Knizhnikov, V. I. Kravtsova
At recent time environment impetuous changes, investigations and mapping of geographical phenomena dynamics became of prime significance.The conception of multi-temporal image (including aggregate of one-moment image and a series of different-temporal images) was introduced as a base of aerospace dynamics investigations.
Retrospective dynamics investigations by one-moment image are carried out at the base of indirect indicational interpretation with using of indicators of process object past state, its velocity, and dynamics stage of evolution at moment of survey, and also indicators of movement, namely single ones (markers) and mass ones (trassers). Stereo-observations and measurements by stereo pair of one-moment images in these investigations have auxiliary character for more reliable interpretation of three-dimensional indicators (height of trees, forms of relief, height of buildings).
Investigations of dynamics by a series of different-temporal images use methods of consecutive interpretation of image dynamic row with fixing of objects statement in different moments. The traditional stereoscopic observations and measurements may be realized for more reliable interpretation. The rows of multi-temporal images and maps may be joined into computer animations, which allow to observe a phenomena in development. The working out of three-dimensional animation is perspective.
The comparisonal interpretation of different-temporal images allows to receive quantative characteristics of dynamics. Some techniques of joint images analysis are use for this purpose: images overlay, creation of difference images, composition of summary images, stereo observations. Stereo pair of different-moment images, having not traditional spatial, but temporal parallaxes, gives the possibility to observe the model of displacement at the base of pseudo-stereo-effect and to measure the quantitative characteristics of movement, namely velocity and direction of displacement In this case the work with stereoscopic images provide with the main source of dynamic information.
Recent conversion to digital stereo survey requires to investigate the features of digital stereo model, not only spatial, but also temporal (model of replacement).
The work was supported by RFFI, Grant 07-05-00187.