What altitude do I need to be to register as being above a biome?

In KSP, I can do science “from space just above Kerbin’s Deserts” or “while flying over Kerbin’s Water”.

At what altitude do I stop “flying over” and start sciencing “from space just above”? At what altitude am I “in space near Kerbin”? In other words, how low do I have to be for the biome to register?

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    Science in Kerbal Space Program knows five corridors:

    • On the Ground
    • Lower Atmosphere
    • Upper Atmosphere
    • Near Space
    • Outer Space

    Note that only sub-orbital flights will be considered atmospherical, even if the altitude is inside the given corridor – aerobraking is considered “Near Space” even if below the threshold.

    That said, the threshold depends on the body:

    Chart of corridors for Kerbin, Mun and Minmus

    On Kerbin (left), anything below ~18km of altitude will be considered flying over (that is, Lower Atmosphere). Outer Space on Kerbin starts at ~250km. The shift from Upper Atmosphere to Near Space is the edge of Kerbin’s atmosphere (~69km), and (as detailed above) may depend on the trajectory.

    On the Mun (middle), there is obviously no atmosphere. Here, the Outer Space to Near Space transition is at ~60km.

    And, for good measure, the same as for the Mun also applies for Minmus (right), but here the threshold is at ~30km.

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