| Figure 5.8 — Tangent and secant cylindrical map projections
A map projection is classified as conic if the generating projection image of:
all meridians of the oblate ellipsoid are radial straight lines and are equally spaced with respect to the longitude of the meridians, and
all parallels of the oblate ellipsoid are concentric arcs and perpendicular to the meridian images.
EXAMPLE 3 Lambert conformal conic (see Table 5.21) is classified as a conic projection.
A conic map projection is tangent if along one parallel the scale factor is equal to one. It is secant if the scale factor is equal to one along two parallels that are not symmetric about the equator. In that case the two latitudes are called the standard latitudes (see Figure 5 .9).
Figure 5.9 — Tangent and secant conical map projections
Share with your friends: | 
