Danie Heath wrote:
I just wanna find out how Simgear actually works. Does it generate the world as a sphere, or as a flat world ?
An irregular WGS84 spheroid, I think, which is more accurate than either flat or spherical.
Speaking of which,
After searching from some more information about the WGS84 model I came across a site that could calculate the local gravity based on the WGS84 model:
http://solid_earth.ou.edu/notes/potential/igf.htm
But after searching a bit more I found the following site with lots of information that might be of interest for us:
http://www.mathworks.com/access/helpdesk/help/toolbox/aeroblks/aero_ref.shtml
This site also had a reference to the World Magnetic Model 2000:
http://www.ngdc.noaa.gov/seg/WMM/DoDWMM.shtml ftp://www.ngdc.noaa.gov/Solid_Earth/Mainfld_Mag/DoD_Model/C_Software/
Is this something we could use?
Erik
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