Hido,
Documents - search for ‘EGPWS pilots guide’, add manufacturer if not Honeywell. Note some systems / authorities allow GS cancellation - GS button / annunciation.
A GS amber (soft alert), is generally considered to be advisory, requiring attention and correction of flight path as necessary - don't over react - check with PAPI.
Which airport; there could be difference in beam sensitivity - angular splay. Cat 2 - 3 are generally more sensitive, but depends on installation.
ILS indications below minima are generally considered advisory - depends on flight calibration.
From the above it should be possible to calculate the vertical height deviation for 1 dot low for given range / height - relatively small and decreasing, but the difference should be checked against the obstacle clearance boundary for the runway concerned (1:40 slope back from 50ft ??) Might be something of interest in
https://www.ecac-ceac.org/images/doc...3_Sep_1988.pdf
B2N2 “
When you follow the glideslope guidance down to the ground you’ll impact in the touchdown zone.”
Depends on transmission type, aerial, and location. Old style reflective beams will not touch the runway due to the parabolic geometry.