Kui nimipinnaks on tasapind (või tasapinna osa), kasutatakse tavaliselt ristkülikukujulist koordinaatmõõtesüsteemi, milles teljed moodustavad paremakäelise Descartes'i teljestiku, kus x-telg, lineaarse jälgimise suuna keskjoon, ja y-telg asuvad nimipinnal, ning z-telg on suunatud väljapoole (materjalist ümbritsevasse keskkonda).
If the nominal is a plane (or portion of a plane), it is usual to use a rectangular measurement coordinate system in which the axes form a right-handed Cartesian set, the x-axis being the direction of tracing co-linear with mean line and y-axis also lying on the nominal surface, and the z-axis being in an outward direction (from the material to the surrounding medium).
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