Civil Engineering Reference
In-Depth Information
Figure 5.9 Switching from global to user's local coordinate frame
animation to be a precise representation of a simulated system, it is necessary to
have contingency in measuring longitude, latitude, and altitude values of different
points in the scene. Sometimes, it is practically impossible to measure these values
on the site. A good example is a point far beyond physical access (e.g. a point on a
body of water) or a series of points too close to be individually detectable by a GPS
device of certain accuracy (e.g. two CAD objects located a few centimeters from
each other when the GPS accuracy is of the same order). Another situation is the
case in which a large number of CAD objects are to be placed in a scene and the only
known pieces of data are the relative distances between them as opposed to their
absolute longitude, latitude, and altitude values. Figure 5.10 shows some such
situations in which providing the global coordinate values for all the individual
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