在水利工程规划设计中,常常遇到将地图由大比例尺变成小比例尺或者小比例尺变大比例尺的绘制问题,花钱机械放缩,不成难题,但受经济条件限制。黑龙江省绥棱县水利技术人员研制出的《x倍直角座标放缩游卡》(简称游卡)放缩地图,误差较小,工作效 In the water conservancy project planning and design, often encounter the map from a large scale into a small scale or scale small scale drawing problem, spend money mechanical scaling, not a problem, but subject to economic constraints. Heilongjiang Province Suleiling County water conservancy technicians developed the “x times Cartesian coordinate zooming card” (referred to as the tour card) zoom map, the error is small, working