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Photogrammetric space intersection requires image coordinates of a point in space to be digitized
on two or more photos. In digital photogrammetry or in single photo digitizing, it is difficult
to locate the matching image of poorly defined point
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设计一个由一条主干道和一条支干道的汇合点形成的十字交叉路口的交通灯控制系统，具体要求如下：
(1) 主、支干道各设有一个绿、黄、红指示灯，两个显示数码管。
(2) 主、支道交替允许通行，主干道每次放行60 s，支干道每次放行30 s，在每次由亮绿灯变成亮红灯的转换过程中，要亮5 s的黄灯作为过渡，并进行减计时显示。 -The design of traffic lights one formed by a main road and a branch roads converging
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设有A、B、P三点，A、B为已知坐标的点，P为未知点，用仪器测得∠PAB和∠PBA,根据A、B的坐标可求得P点的坐标，这种方法叫做前方交会-Features A, B, P three points, A, B point coordinates are known, P is an unknown point, as measured by the instrument ∠PAB and ∠PBA, the coordinates A, B coordinates of point P can
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