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Query regarding WGS84.img file

Question asked by msk160530_6317 on Jun 6, 2017
Latest reply on Jun 9, 2017 by msk160530_6317

Hello ESRI team,


I have a small query regarding WGS84.img file as part of ArcGIS installation.



I have gone through very useful article. URL below:


Converting from orthometric to ellipsoidal heights—Help | ArcGIS Desktop 


As part of standard equation:

h = H + N


It is little confusing as it mentions:


h = H + N



h = ellipsoidal height
H = orthometric (geoid) height
N = geoidal separation

What I understand is orthometric and geoid heights are different.

Which part WGS84.img is in above equation?

My Best,
Meghan S Kulkarni