Normally the second or third try should bring the triangle of error down to a point. This intersection is used to orient the plane table. A check on a fourth location will prove the location. Another method you can use to plot the location of an unknown point from three known points is the tracing-cloth method of resection. Figure 9-6 illustrates this method.
P is the point of unknown location over which the plane table is set.
Then you draw rays from P toward the three known stations. The intersection of the rays marks the location of P, which can be pricked through the tracing paper to locate the point on the map. Integrated Publishing's Official Web Page Click here for a current index of everything on this web site. All Rights Reserved.