Calculating Cartographic Areas - GPS TrackMaker Reference Manual

10.6 Calculating Cartographic Areas

This option is available only in GPS TrackMaker Professional® .
The cartographic area is calculated directly on the cartographic grid, considering only Earth dimensions, not
accounting for local characteristics like altitude and meridian convergence. For further information about the
difference between cartographic surface and topographical surface, see
Surface.
GPS TrackMaker® calculates the cartographic area in the following rectangular systems:
- User Defined Grid
- UTM (Universal Transverse Mercator)
- RTM (Regional Transverse Mercator)
- LTM (Local Transverse Mercator)
- British National Grid
- British Uniform Grid
- New Zealand Grid
- Swiss Grid
- Swedish Grid
- Irish National Grid
- German Grid
- Finnish National Grid
- Grid of Colombia
- Taiwan 67 Grid
- Dutch Grid
If the program is configured to geographical coordinates, the cartographic area will be calculated based on the
UTM system.
Note: use the specific datum of your area.
TIP: The calculated area can be indicated in the screen as a Waypoint. Just click on the comments textbox when
creating the Waypoint, and using the arrow keys, select the value. When length and area are calculated, they are
recorded (hidden) in the textbox of the Waypoint comments .
Ellipsoidal Area: the cartographic area is only calculated, if all points of Tracklog are in the same zone. If any
point is located in other zone, GTM PRO® will calculate the Ellipsoidal Area. This area is calculated considering a
tangent surface from Earth Ellipsoid, ignoring the scale factor.
To calculate cartographic areas delimited by Tracklogs, select the Tracklog
as shown in Selecting Data
Toolbar or in the Tools menu. The value will be indicated in the status bar
at the bottom of the screen, in the
Report window.
122
Topographical Surface x Cartographic
then click on the Cartographic Area
Area Unit of Measurement, as well as in
on the