I have measurement data that uses X/Y in different zones of JGD2011 and an ellipsoid height above GRS1980 (but it also includes a geoid height as well). My task is to transform this data to "WGS84 LLA".
For the horizontal part I used a transform from (for example) EPSG:6677 to EPSG:4326, and all seems well. However, I am really confused what to do with the height (and whether I even need to do something).
The WGS84 and GRS80 ellipsoids seem to differ, but I was unable to find out by how much, and how to convert the data.
So my question is: how should I handle the height? I am not even sure if I should output the ellipsoid height or geoid height, WGS84 also includes a geoid definition ...?