Geoid height EGM96 to WGS84 for several pixels

[ID-work]

Hello i'm trying to calculate the geoid height in several points.
for example in lat\lon 57.8,-5.11 the height should return around 55 [m]
for 30,-50 i should get around -17 [m]

i wish to insert several lat/lon points like the ones above and get their geoid height.

can anyone help with that?

thanks

[snowman2]

See: #630