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利用“嫦娥一号”CCD相机获得的遥感影像及其经三线阵数字摄影测量处理后的DEM数据(空间分辨率为500m)进行了月表形貌特征分析.结果表明:月球的平均高程为–742m,最大高程点和最小高程点均位于月球的背面,其中前者位于Engel’gardt撞击坑东缘,后者位于Minkowski撞击坑的次级撞击坑内;月球表面相对平坦,大部分坡度在15°以下,占月球总面积的90%,月球高地的坡度值变化较大,平均坡度大于7°,月海坡度变化较小,多数在3°以下;月表起伏度计算的最佳统计窗口为16km2,大部分区域起伏度在200m以下,而起伏度大于2000m的大起伏山地主要分布在撞击坑周围的环形山区域;基于高程、坡度、起伏度及影像灰度值的归一化处理数据,利用最大似然法进行月海和月球高地的自动提取,其结果与美国地质调查局出版的地质图进行精度评价,获得Kappa系数为0.78,该方法可以较好地进行月球形态特征的提取及分析.
The lunar surface morphological characteristics were analyzed using the remote sensing images obtained by the Chang’e-1 CCD camera and its DEM data (spatial resolution of 500m) measured by the three-line digital photogrammetry.The results show that the average lunar elevation Is -742m. The maximum elevation point and the minimum elevation point are located on the back of the moon. The former is located on the eastern edge of the Engelgardt craters and the latter is located in the secondary craters of the Minkowski craters. The lunar surface is relatively flat with most of the slopes at 15 °, accounting for 90% of the total lunar area, the lunar highland slope value changes greatly, the average gradient is greater than 7 °, the monthly variation of the monthly sea level is small, most of them are below 3 °; the optimal statistical window for lunar surface relief is 16km2, most of the regional undulation below 200m, and undulating more than 2000m in the mountainous areas are mainly distributed in the crater around the crater area; based on elevation, slope, undulation and image gray value of the normalized data, the use of Maximum likelihood method for the automatic extraction of the Moon Sea and the lunar highlands, the results with the accuracy of the Geological Survey published by the United States Geological Survey to obtain a Kappa coefficient of 0.78, the method can be better for the month Extraction and analysis of morphological features.