Re: What coordinate system should I use?

In article <3043t35240u0u839c7a2diohbmjhb2q168@xxxxxxx>, Happy Trails <nomail@xxxxxxxxxxx> writes
What coordinate system should I use?

I want to create some software to augment the mapping process that I
now use, with a few functions that I am not happy with as they stand.

You might get more helpful answers if you tell us what you already use and what you hope to achieve with your augmentations.

I need to decide upon a method of calculation for the coordinates I
will use in this software.

I note that GpsMapEdit uses Lat & Lon in it's coordinates as displayed
or otherwise shown to the user. I am wondering if anyone here knows if
it also uses Lat & Lon in its internal calculations, or if it performs
any projection to some cartesian system to ensure correct geometry, or
if it uses spherical trig for calculations.

Use lat and long and spherical trig for calculations. If you need to display the output on / as a map you will need to use and appropriate projection.

You may be interested in the partial source code available for GPSMapEdit:

http://www.geopainting.com/en/src.html

That may answer your questions if the specifically relate to GPSMapEdit.

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Dominic Sexton
.