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Add ECEF/EPSG 4978 projection functions#9

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tejado wants to merge 1 commit intogheja:masterfrom
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Add ECEF/EPSG 4978 projection functions#9
tejado wants to merge 1 commit intogheja:masterfrom
tejado:patch-1

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@tejado tejado commented Jan 6, 2021

As the trilateration function does not work with ECEF/EPSG 4978 coordinates (used by Google Maps and OpenStreetMap), I'm adding the projection methods.

These are also used in the python code of following stackexchange answer: https://gis.stackexchange.com/a/415, which looks very similiar as the trilateration function.
Other projections like proj4s did not gave correct results.

As the trilateration function does not work with ECEF/EPSG 4978 coordinates (used by Google Maps and OpenStreetMap), I'm adding the projection methods. 

These are also used in the python code of following stackexchange answer: https://gis.stackexchange.com/a/415, which looks very similiar as the trilateration function.
Other projections like proj4s did not gave correct results.
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