Posts: 1
Joined: Wed Jan 07, 2009 2:32 pm
Location: Greece

2D-Cartesian Grid for Europe

Wed Jan 07, 2009 2:46 pm


Thanks for the excellent GpsTools product. I mostly use it for conversions between different datum/grid systems. I am already a registered user.

I am new in the area and I have an urgent question:

I just started developing a fleet management software that, until now, has been intended for Greece and the GGRS87 Grid worked perfectly.

From now on, the software should be able to work on a paneuropean basis. Obviously, the GGRS87 Grid is no more accurate (shifts eastings or northings while in other countries).

Thus, I need a new Grid system that covers the whole Europe. Due to the nature of the calculations in the software, it should remain two dimensional (UTM_NORTH that additionally uses the zone would pose severe changes in the business logic). Moreover, I need to be able to calculate distances using pythagorean theorem for distances in different countries like I did using the Greek Grid System until now.

What kind of solution would you recommend for my problem?

Any answer is welcome and highly appreciated, thanks in advance!

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Posts: 15297
Joined: Wed Aug 04, 2004 10:40 pm
Location: Sweden
Contact: Website

RE: 2D-Cartesian Grid for Europe

Wed Jan 07, 2009 2:54 pm

For larger areas like whole Europe you cannot use a grid, and you cannot use Pythagorean theorem to calculate distances. This is because The Earth is a sphere and grids makes different kind of approximations to make it "flat".

You need to use a datum longitude/latitude. The best choice is WGS84. To calculate distances over a datum you use Great Circle Distance calculations. More info here:


Franson Support

Posts: 1
Joined: Fri Oct 23, 2009 2:10 am
Location: Greece

RE: 2D-Cartesian Grid for Europe

Fri Oct 23, 2009 2:23 am

Hello GreekBoy,

i am trying to develop a pda application using GGRS87 maps.
i have worked previously with WGS84 with no problem.

Can you please advise me what i have to do to work with GGRS87. i create the maplib and i load it in the application but i cannot see it.

Your help will be very much appreciated.

Many thanks


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