Angle measured counter-clockwise from the perpendicular projection of the pen onto the writing plane to the pen. Altitude values can be acquired as time-series data. Altitude is a factor representing the pen inclination, and it is used together with azimuth. These features are used for on-line signature verification.
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(2009). Pen Altitude. In: Li, S.Z., Jain, A. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-73003-5_1107
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DOI: https://doi.org/10.1007/978-0-387-73003-5_1107
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