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在农业规划设计中,经常需要测绘独立小区域大比例尺地形图。通常在测区布设小三角(网)或经纬仪钢尺导线(网)作为首级控制。而测站点的加密,则采用视距导线,根据不同的比例尺测图,主要布设成尽可能等边的附合导线形式。导线全长一般不超过500～1000米,边长一般为100～200米。视距导线的计算方法和经纬仪钢尺导线相同。即当角度闭合差在允许范围内时,首先进行角度闭合差的调整,然后按调整后的角度进行坐标增量闭合差的计算,若合乎限差,就进行坐标增量的平差,最后计算各点的
In agricultural planning and design, it is often necessary to map large-scale topographical maps of independent small areas. Small triangles (nets) or theodolite gauge wire (net) are usually placed in the survey area as the primary control. The station site encryption, the line of sight is used, according to the different scale mapping, the main layout as much as possible the side of the attached wire form. The overall length of the wire is generally not more than 500 to 1,000 meters, the length of the side is generally 100 to 200 meters. The line-of-sight calculation method is the same as the theodolite wire. That is, when the angle closing difference is within the allowable range, the angle closing difference adjustment is performed first, and then the coordinate incremental closing difference calculation is performed according to the adjusted angle. If the limit deviation is satisfied, the coordinate incremental adjustment is performed and finally calculated Every point