A cylindrical map projection is specified by formulae linking the geographic coordinates of latitude φ and longitude λ to Cartesian coordinates on the map with origin on the equator and x-axis along the equator.
Asukni n karti ijjăn s silindir tibde formulae ta tosăɣăt coordinate tan n jografia win tahrike φ d tišijrit  λ s coordinate tan win Cartesian fal kărti s iwar uɣna net equator d alwaq daɣ oran fal equator