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目前,全国正在开展第二次土壤普查,各地已广泛地使用了航空象片。实践证明,航片信息丰富,影象逼真。使用航空象片为底图,不但可以加快土普进度,增加图斑的详度,保证精度要求,同时也方便基层群众。但是,由于航空象片是以中心投影的原理成象的,象片上的各个象点存在着比例尺误差、倾斜误差、起伏误差。这些象点位移所带来的误差,给调绘、成图和量算工作带来许多不便,也给应用航空象片带来了许多新问题。为此,在农安、
At present, the second national soil census is under way in the country and aerial photographs have been widely used throughout the country. Practice has proved that aerial photo information rich, vivid images. The use of aerial photographs as the base map, not only can speed up the earth progress, increase the detail of the map to ensure the accuracy requirements, but also convenient for the grassroots. However, since the aerial image is imaged on the principle of central projection, there are scale errors, tilt errors, and fluctuation errors at various points on the image. The errors caused by the displacement of these points bring many inconveniences to the work of drawing, mapping and measuring, and also bring many new problems to the application of aerial photography. To this end, in agricultural security,