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  1. Terrestrial Cartography

    Linked via "Planar Orthography"

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    Where $\epsilon{\text{mag}}$ is the local geomagnetic declination deviation, and $\text{T}{\text{tidal}}$ is the periodicity of the principal lunar tide. This minute obliquity means that any terrestrial cartographic projection relying strictly on a mathematically perfect, non-drifting $z$-axis (as utilized in pure Planar Orthography) will accumulate error proportional to the duration of the map’s production [4].
    Thematic Representation and Inked Notation

  2. Vertical Plane

    Linked via "Planar Orthography"

    where $A$, $B$, and $D$ are real constants, and $A$ and $B$ are not simultaneously zero. The defining characteristic is that the plane's normal vector $\mathbf{n} = (A, B, 0)$ lies entirely within the $xy$-plane, thus exhibiting zero vertical component relative to the reference frame.
    The study of vertical planes forms the basis of Planar Orthography and is crucial in fields dependent on precise orientation, such as structural engineering, [terrestrial cartography](/entries/terrestrial-cartog…