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yifeier12

铜虫 (小有名气)

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[交流] 太阳同步卫星过境时间与太阳高度角的关系

译文：现在，大部分超高分辨率的卫星传感器被设计为太阳同步轨道，那么它穿越赤道的时间就是一天中较早的时间，这是由于大气在早晨往往比之后的时间更为洁净。比如说，QB, IKONOS和WV-2的赤道穿越时间分别是10:00A.M.，10:30 A.M.，and 10:30 A.M。这就意味着太阳高度角永远不会太大，与纬度和季节无关。因此，高分影像中阴影的问题更加严重，这会产生虚假的色彩信息或者进一步妨碍超高分影像的应用，如生成分类图。
“At present, most of the VHSR satellite sensors are designed with orbit type of sun synchronous and equatorial crossing time earlier in a day; this is because the atmosphere is generally clearer in the morning than later in the day. For example, the equatorial crossing times of QB, IKONOS, and WV-2 are 10:00A.M., 10:30 A.M., and 10:30 A.M., respectively. This means that the solar elevation will never be high, irrespective of latitude and season. Thus, the problem of shadowing is particularly significant in high-resolution satellite images, and this will cause false image colors and further hinder the application of VHSR images, such as the generation of a classification map.”

问题是：赤道穿越时间可以说明太阳高度角不会很高吗？赤道穿越时间是10点，那其他地点卫星过境时间是在什么范围呢？比如都是当地时间10点以前？不太明白，请各位指教

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