利用 GIS 方法建立了数字高程模型（DEM），研究了子汇水面积的边界。
By means of GIS method, the digital elevation model(DEM)is established, the subcatchment boundaries are studied.
根据一项最新的模型研究，大面积南极冰川已经达到临界点。
A major Antarctic glacier has passed its tipping point, according to anew modelling study.
建立了梯度面积投影曲线模型，用于候选人脸的校验。
A model of grads area projection curve is built to verify face candidate.
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