Area Calculations

Caution : The accuracy of the calculation of areas from a map depends on many factors (and combination of factors) some of which are :

• the scale of the map
• the type of map projection used
• the size of the area being calculated.

Do not rely on the result where accuracy is essential.

Limitations

Area calculation will only produce acceptable answers if the following conditions apply.

• There is a limit of 15000 track points that can be used to mark the perimeter for the Area Calculation.
  
• The Area calculation is only designed to be used on maps covering small areas, say 1:100000, 1:50000, 1:25000 and similar. For maps which display full countries or continents or world maps the caution above applies.
  
• The track must not fold back on itself.
  Is NOT acceptable and will give a bad result.
  
  This is an example of a good track for area calculation.

Using the Area Calculation

On the Options Menu select the Area Calculation option.

The Area Calculation dialog will be displayed.

Press the Create Track Point Button on the toolbar and draw a track around the perimeter of the area you want calculated by clicking on the map to form a track. As you draw track points the polygon will be filled with hatching. The area will be displayed in the dialog. Select the units for the area.