According to the catastrophe rule of pest in agriculture the qualitative and quantitative catastrophe model was set up and the sudden change region was determined.

在农业病虫害突变规律的研究基础上，建立了定性与定量的尖角突变模型，确定了各病虫的突变区域。

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From the standpoint of complex systems and with the aid of (e), the understanding of 'from quantitative change to qualitative change' is discussed.

还从复杂系统的观点并借助(e)式讨论了对“从量变到质变”的进一步认识。

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This paper presents a spatial analysis method based on multi-temporal DEM elevation changes and DOM images changes and gives a qualitative and quantitative analysis of the terrain change.

提出了多时相dem的高程变化与DOM影像变化分析协同的空间分析方法，对地表变迁进行了定性与定量的分析。

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