可以利用等比级数的原理计算象素分辨率，从而确定象素的地理位置。
The resolution of each pixel can be computed according to the principle of geometrical progression. The geographical position of the pixel, in turn, can be determined.
就此讨论一类等比级数在求幂级数的和函数以及将函数展开成幂级数时的应用。
In this paper, we discuss how to use the geometric series to find the sums of power series and to represent functions by power series.
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