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1manprojects / one_Sgp4

C# SGP4 orbit prediction Library
MIT License
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wrong value for Coordinate.getHeight() ? #5

Closed edetoc closed 6 years ago

edetoc commented 6 years ago

I'm using the library to track the ISS based on TLE elements obtained from https://www.celestrak.com/NORAD/elements/stations.txt The library gives correct values for longitude/latitude and velocity. However I believe there's a glitch in the Height calculation (Coordinate.getHeight() ). I assume the Height is in Km. the Height value is different from what I can see here: http://www.esa.int/Our_Activities/Human_Spaceflight/International_Space_Station/Where_is_the_International_Space_Station For instance, when the ESA url shows Altitude of 417 km, getHeight() returns 407 km.

thanks, Eric

1manprojects commented 6 years ago

Yes the height is in km. Also you are correct the height is not being calculated correctly it has a slight offset since it at its current state will always use the WGS_72 constants instead of WGS_84. This will be fixes soon however i cannot provide a time frame.

edetoc commented 6 years ago

thank you.

1manprojects commented 6 years ago

Has been fixed with commit dddc3c6