The problem of determining the value or spatial variation of a physical property or feature by comparing measurements to the predictions of a model.
通过测量值与模型预测值的比较，确定某个物理属性的值或其空间变化的问题。
And a theoretical model is established to expound the variation of pulse duration and the modulation on the pulse envelope similar to the diffraction characteristics in spatial domain.
通过与光束的空间传输特性类比解析了光栏宽度变化引起的脉宽变化以及脉冲轮廓出现时间衍射调制现象；
Puff trajectory model can deal with the temporal spatial variation of source parameters and meteorological elements, and can be used to simulate the diffusion of all kinds of scales and sources.
烟团轨迹模式能够处理源参数和气象要素的时空变化，适用于各种尺度和各类源的输送扩散模拟。
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