Geoids, projections, datum, what?

At work I came across this nice article that explains some basics of GIS data projections, datums, geoids, etc. Although the target audiance of it is more the oil industry, I think it would also be good reading for people making FsX terrain scenery and wanting to know a little more about what could be involved when using GIS data. Because knowing that the data is in the right projection, etc is very important for the best result.

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