What altitude does the "Apt Elev" on the Jeppesen charts represent? According to my research, the height we call "airport elevation" indicates the highest altitude on the landing surface at the airport. I think that what is meant by the landing surface is the runways. In the chart given below, we see that the "Apt Elev" height is higher than the highest runway threshold altitude. When this is the case, I think that the highest point on the runway is not at the end of the runway and at the beginning of the runway, but in this case, can there be curved runways with the highest point in the middle? As a result, I sometimes see that "Airport Elevation" is given higher or lower than the highest runway threshold heights on some charts. Is it because the definition isn't correct or is it because I'm missing something? I'm also asking because I see the definitions are the same: Are "Field Elevation" and "Airport Elevation" the same thing?
-Images from LTCN Jeppesen charts-