Choose a Topic
Resection Simulation Instructions
This page launches a Java applet simulation of the Resection process and requires your browser to be 'Java Enabled'. If your browser is not already Java enabled, please edit your browser preferences now.
At the bottom of this page is a button which will launch the Resection Simulation. Be patient, it may take a while to load.
The Resection method enables you to find the position of an unknown target by measuring its position relative to three (or more) known stations. The geometry of the station positions you use will affect the precision and accuracy of your findings. This simulation allows you to experiment with various different combinations of station positions around a target in order to show you how your choices affect your final calculations.
The toolbar of the Resection Simulation contains four icons as listed below:
Select
This tool can be used to select any station by clicking on it. To move the station to a new position once it has been selected, click anywhere else on the screen. The station should reappear in the new position.
Target
To add a new target, first select this icon and then click anywhere on the diagram.
Angle
This tool is used to add a new angle. First select the tool with the mouse. Then select a reference station, select the target and finally select the last reference station. The angle will be drawn in clockwise from the first reference station you selected.
Delete
This tool is used to delete any station or angle by clicking on it.
Once all the targets and angles have been added push the Calculate button to calculate the variance of the coordinates and the co-variance which appear below. A red error ellipse for the new station is also drawn. The smaller the ellipse is the more precise the results of your resection are. The error ellipse will alter in shape depending on the geometry of the angles you measure.
Note: The error ellipse will only be drawn if the server side application is running. If it is not shown after you press the Calculation button, please email the site maintainer.
 |