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5.7.3 Range and Bearing Control
Overview
The Range and Bearing Control shows the distance, azimuth, and back azimuth of a great circle line connecting two positions on the Earth's surface.
images/RangeAndBearingControlGui.gif

When the range and bearing control is first created a range and bearing line, shown in red in the above figure, is added to the main view window. The distance and azimuth values are shown on the Legend in the main view window, and at the top of the range and bearing control window. The latitude-longitude position values of the end points are also shown. Computations are based on the WGS-84 reference ellipsoid, using computation code from the U.S. National Geodetic Survey.

Note The line shown on the display is not the great circle path connecting the end points. The values are computed for a great circle path on the ellipsoidal earth, using the numerical latitude and longitude values, not the line on the display. The line shown in the display is a straight line on whatever map projection you happen to have; usually it will not coincide with the great circle line.

Note If you change the map projection, an existing range and bearing map line will stay at the same location in the display, hence the end points on the map are in new locations. The distance, azimuth, etc. values in the control window reflect the latitude-longitude positions in the control window and hence do not match the display picture until an end point is moved by hand.

Properties

 


Previous: Mutli-Display Holder Next: Text Notes Table of contents Images Frames Unidata's Integrated Data Viewer > Display Controls > Miscellaneous Controls