The Design and Application of GIS Mathematical Model Database System with Meta-algorithm
Zhijiang Li · 2016
Meta-algorithm in GIS system changes the single and fixed mode of mathematical model creation in GIS system, which adapts to the new development demand.This paper focuses on analyzing mathematical model library system and GIS mathematical model library system under meta-algorithm, classifies models, designs model logical organization structure and system model management, and meets the new demands of GIS on mathematical models.Provide positive and reliable algorithm support for GIS to make it better applied to the practice of social production.GIS has close relationship with mathematical model.GIS functions such as data access, preliminary processing and query data, etc., all revolve data, which directly or indirectly use more mathematical models.Fixed static mathematical model in the past is a fixed static form.Model management is relatively single, giving priority to application.The mathematical model now can't meet the new development of GIS, and GIS mathematical model database system design and application under meta-algorithm can well meet the new development. I. META-ALGORITHMThere are lots of GIS algorithms, which are complex and changeable, but overall they can be generalized down into several basic algorithms combination.These are "meta-algorithms"."Metaalgorithm" is now widely used in scientific research and in various fields of social productions, and GIS is no exception.When using this algorithm in GIS field, there should be no principle of "the thinner, the better" selection algorithm, and should reasonably select algorithm considering the actual demand.Spatial analysis in GIS system, for example, involves a large number of spatial data probability algorithms.There is a need to establish corresponding algorithm, referring to as "extended algorithm".Actually meta-algorithm has some specific classification.The first is basic meta-algorithm.Elementary function calculations often use this kind of algorithm, such as trigonometric functions, logarithmic function, exponential function and simple addition, subtraction, multiplication, and division, etc. in basic elementary function.Some elementary functions often use this algorithm.Extension meta-algorithm is the second.GIS often uses this with greater use frequency.But it is a kind of basic algorithm beyond the basic meta-algorithm.Extended metaalgorithm is often used in the process of GIS data acquisition, processing and analysis.Spatial analysis in theory of probability and fuzzy mathematics content will also use this extension metaalgorithm to reduce repeated computation effectively, which will also facilitate the building of the new algorithm model [1]. II.