I just controlled bicubic interpolation using Global mapper. Same result here, also Global mappers maximum is even 1213 m for the 1206 peak. And funny detail: The 1213m maximum is at a position, where in the .hgt file the edge of the peak-pixel is about 50 meters away
I also looked at the result using bilinear interrpolation: Using this method, each map-pixel is <=1206 m
Just for interest: Is there a reason why bicubic is better for elevation files than bilinear?
Bicubic:
Original:
Bilinear:
I also looked at the result using bilinear interrpolation: Using this method, each map-pixel is <=1206 m
Just for interest: Is there a reason why bicubic is better for elevation files than bilinear?
Bicubic:
Original:
Bilinear: