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《Quaternary Sciences》 2003-03
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ISSUES ON MULTI-SCALES IN ECOGEOGRAPHICAL MODELING

Yue Tianxiang Liu Jiyuan ( Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101)  
Ecogeographical modeling is quantitatively describing ecosystem structures, spatial patterns and processes on various temporal and spatial scales. Its direct aim is to describe and analyze spatial patterns and processes of taxa. Its final aim is to simulate the spatial evolution law of ecosystems and ecosystem services. Ecogeography is an integration of ecology and geography so that ecogeographical modeling must deal with all scale issues involved in ecology and geography. Scale transformation, cross-scale interaction, linkage between spatial scale and temporal scale, and multiscale data fusion are essential works of ecogeographical modeling. The primary results show that hierarchy theory might be employed to solve problems of the cross-scale interactions by choosing appropriate search radius and constructing cross-scale model. For spatial hierarchical systems, grid generation method is useful for solving problems of nonlinear scale transformation by establishing standardized grid generation regulation and constructing model for multi-scale information fusion. For scale transformation between different resolution pixels of remotely sensed data, the first step is to establish basic equation of digital model by means of surface theory; the second step is to retrieve first approximate formulation using available information which would be repeated until required accuracy is reached. Grid computing is an useful technique to solve problems of computing capacity overload.
【Fund】: 国家“973”项目 (批准号 :2 0 0 2CB4 1 2 5 0 0 );; 国家自然科学重点基金项目 (批准号 :90 2 0 2 0 0 2 )资助
【CateGory Index】: X171.5
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