Pettengill G H, Rogers A E, Shapiro I I
Science. 1971 Dec 24;174(4016):1321-4. doi: 10.1126/science.174.4016.1321.
Radar observations of Mars with a surface resolution of 1.3 degrees in latitude and 0.8 degrees in longitude have been carried out during the opposition of 1971. With a precision in surface height measurement approaching 75 meters in regions of high reflectivity, it has been possible to measure the detailed characteristics of a number of craters. Many of these can be identified with craters shown in Mariner photographs of Mars. In addition, a scarp has been seen at 41 degrees west, 14 degrees south with an average slope of about 6 degrees extending over about 40 kilometers.
在1971年火星冲日期间，对火星进行了雷达观测，其地面分辨率为纬度1.3度、经度0.8度。在高反射率区域，表面高度测量精度接近75米，从而有可能测量一些陨石坑的详细特征。其中许多陨石坑可与火星水手号探测器拍摄的照片中显示的陨石坑相对应。此外，在南纬14度、西经41度处发现了一条陡坡，平均坡度约为6度，延伸约40公里。
