Aerovisual Observations as a Source of Geocryological Information

摘要

Extended linear objects are characterized by wide diversity of geocryological, climate, geomorphological, hydrological, and other types of natural conditions. One of promising methods used to analyze the information obtained in the process of aerovisual survey is the comparison of the distribution and intensity of exogenous geological, primarily geocryological, processes and landscape geological characteristics of the terrain (obtained with the use of the existing zoning systems). The comparison is aimed to identify the role of natural and technogenic factors in the activation of those processes within different areas. Disadvantages of aerovisual observations are as follows: 1. Aerovisual observations cannot ensure precise setup of an object, therefore, they have to be used together with other remote methods (orbital survey, aerophotographic survey). 2. This type of observations provides no detailed information on the object in question and, at particular sites, its results have to be updated in the process of field land investigations. 3. Analysis of the dynamics of some extended cryogenic phenomena, such as thermoerosion, is complicated, since it is not possible to cover them by a single shot. Conclusions on their activation can be made on the basis of indirect signs only.