Geographic coordinate system

[NZSnowman]

I was wondering if you are using a Cartesian coordinate system (Northing & Easting) or Latitude and Longitude for the navigation system?

If you are using a Cartesian coordinate system how are you dealing with distorts?

 

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We use lat, long.

 

[NZSnowman]

Thanks. So the map is ellipsoidal? I know several other games that cover large map area have found that geographical distance & geographical coordinates formulas can be CPU heavy when there are many units to formula for.

 

[unmerged(255172)]

Thanks. So the map is ellipsoidal? I know several other games that cover large map area have found that geographical distance & geographical coordinates formulas can be CPU heavy when there are many units to formula for.

That is very true. We found out that the less expensive formulas (e.g. Haversine) are simply not accurate enough for unit movement. The good methods (e.g. Vincenty) are quite computationally intensive, but really, CPU/FPUs are extremely powerful these days, even in older PCs.

It's really the only way to make it accurate when you're using real world maps.