RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 10, ES6001, doi:10.2205/2007ES000261, 2008
[17] At the present time seven portals have appeared in the Internet, supporting compatible protocols of data transmission and about 20-30 sites, operating through the main portals. The environment provides researchers with a great number of accumulated geodata, distributed among the project portals and in the Internet, and a user doesn't have to make any transformations. These data includes descriptive data (publications, references, etc) and digital data: main geographic (model of relief, river, lake etc.), geophysical (magnetic and gravitational anomalies etc) and geological digital data, embracing the whole globe. Digital data is provided to a user both directly from the project servers (static or rarely changeable data) and through proxy-servers for quickly changeable data (operative catalogue of earthquakes). The system allows using of data, corresponding to the standards of OpenGIS consortium - WMS, WFS and WCS. Moreover, a user is provided with various on line methods and algorithms [Gitis and Yermakov, 2004], part of which is implemented in a distributed GRID environment. Search and integration of data is implemented by a powerful system of classifiers supplied with programs of data correlation [Arskiy et al., 1999]. Thus the system "Electronic Earth'' possesses a universal information-analytical field in the sphere of geoscience. Due to existing standards for metadata and protocols of exchange of data between the "Electronic Earth'' project participants connecting to new portals and separate computers becomes an easy and inexpensive task for any organizations, dealing with research in the field of Earth Sciences.
[18] Let us discuss a concrete example of complex analysis, implemented in the environment "Electronic Earth'' according to the data of the integral data bank of IGEM RAS.
[19] The task consisted of (A) establishing a multivariate link between gold ore deposits of the Kuril-Kamchatsky volcanic belt and the parameters of geological environment and (B) application of the obtained empirical dependency for predicting new gold ore deposits.
[20] The following data resources of the "Electronic Earth'' environment and object-oriented resources of IGEM RAS were applied as initial data:
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Figure 5 |
[22] The primary data includes examples of gold ore deposits but contain no information about the researches territories, where these deposits are absent. It impedes carrying out of a complex analysis using classical methods of image identification. An alternative decision implies the construction of decisive rule, designed as a cover of objects of a study sampling of one class. Given some assumptions the cover can be constructed as a function of certitude in the presence of the deposit [Gitis and Yermakov, 2004].
[23] The following items were selected for the problem solution:
[24] It was assumed that an increase of values of each parameter at other equal conditions doesn't exclude a possibility of the presence of gold ore deposit. In this case the function of certitude in the presence of the deposit due to the selected prognostic parameters correlates with the function of empirical distribution. The inductive decision rule requires the study sampling, including all the present deposits.
[25] Let us denote the sampling of precedents
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Figure 6 |
[27] Let us explain the inductive conclusion using the terms of the subject-matter:
IF ground surface heights > 500 m;
AND the distance to Pliocene volcanic constructions is less than 60 km;
AND the summarized length of faults in circle R = 30 km exceeds 50 km;
AND the volcanic rock of the Neogene period is present;
THAN gold, gold-silver, polymetallic gold- with lead and zinc prevailing over copper or gold-quartz deposits.
[28] Thus by this example the efficiency of the "Electronic Earth'' system for solving concrete tasks in the field of Earth sciences is shown.
Citation: 2008), Electronic Earth -- network environment of search, integration and analysis of geodata, Russ. J. Earth Sci., 10, ES6001, doi:10.2205/2007ES000261.
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