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飞机播种造林时,要靠地面导航标志,才能有条理的飞航将种子均匀的撒在地面上,所以播种前必须在播种作业区的大地上,按带的方位角及宽度作出互相平行Ⅲ等距的直线,用木桩标志之,这种作法称之为航标测设。这些平行且等距的直线称为航线,航线上的标志应设在明显的山脊上,这些点称为航标点,相邻各航线航标点所组成的线称为航标组,用Ⅰ—Ⅰ,Ⅱ—Ⅱ等标之如图1,两航线所构成相互平行的带形称为播带,其宽度一般在50～60公尺,多年来,我们均采用60公尺,效果良好。
Aircraft sowing reforestation, relying on the ground navigation signs in order to orderly flight of the seeds evenly sprinkled on the ground, so before sowing in the sown area of the earth, according to the azimuth and width of the band made parallel to each other Ⅲ From the straight line, with wooden sign, this practice is called aids to navigation set. These parallel and equidistant lines are called routes. The marks on the routes should be set on obvious ridges. These points are called aids to navigation points. The lines formed by adjacent airships are called aids to navigation. Ⅱ-Ⅱ standard such as shown in Figure 1, the two routes formed by the mutual parallel band called tape, its width is generally 50 to 60 meters, over the years, we all use 60 meters, the effect is good.