航海海图第二章 地图投影及其分类 地图投影与比例尺(Projection and scale) 地图投影（也称图法），是将地 球表面的经线和纬线，按一定的 数学法则，绘画到平面上去，成为地图的经纬线图网的方法。
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map projection and scale 投影和比例尺
Contract the coordinate between different known survey points in mining area and the survey points by GPS receiver after establish the projection mode and scale parameter.
对投影方式及比例参数设定后，再利用矿区不同的测量已知点与手持GPS接收机测量点坐标进行对比。
The gray scale projection algorithm is a key technique for detecting motion vector of image sequential frames and realize electronic image stabilization.
灰度投影算法是检测图像序列帧间运动矢量，实现电子稳像的关键技术之一。
The common fabrication technologies of binary optical elements were expatiated, including etching, thin-film deposition, direct writing, excimer laser projection and gray-scale masks.
综述了二元光学元件的常用制作工艺技术，包括台阶刻蚀法、薄膜沉积法、直接写入法、准分子激光加工法和灰阶掩模法。
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