For terrain gray images, a pretreatment methodology for restraining noise and blurriness and an improved algorithm for extracting terrain roughness are given.

针对地形灰度图像，给出一种抑制噪声模糊的图像预处理方法和改进的地形粗糙度提取算法。

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For elevation data, a regularized interpolation for resampling and an algorithm for extracting terrain roughness and slope with landing area plane fitting are presented.

针对高程数据，给出一种规则化插补的重采样方法和基于着陆区平面拟合的粗糙度与坡度提取算法。

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The quantitative dependences of these numerical features on the fluctuant standard deviation and roughness of terrain are given, they provide the reference and basis for engineering designing.

求出了这些数字特征与地形的起伏标准差、粗糙度以及航速、航向误差之间的定量变化关系，为工程设计提供参考和依据。

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