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By N. Bowditch

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316. Gnomonic Projection If a plane is tangent to the earth, and points are projected geometrically from the center of the earth, the result is a gnomonic projection. See Figure 316a. Since the projection is perspective, it can be demonstrated by placing a light at the center of a transparent terrestrial globe and holding a 314. Polyconic Projection The latitude limitations of the secant conic projection can be minimized by using a series of cones. This results in a polyconic projection. In this projection, each parallel is the base of a tangent cone .

Several of the common azimuthal projections are perspective. 316. Gnomonic Projection If a plane is tangent to the earth, and points are projected geometrically from the center of the earth, the result is a gnomonic projection. See Figure 316a. Since the projection is perspective, it can be demonstrated by placing a light at the center of a transparent terrestrial globe and holding a 314. Polyconic Projection The latitude limitations of the secant conic projection can be minimized by using a series of cones.

As the distance from the pole increases, however, the distinctive features of each projection become important. The modified Lambert conformal projection is virtually conformal over its entire extent. The amount of its scale distortion is comparatively little if it is carried only to about 25° or 30° from the pole. Beyond this, the distortion increases rapidly. A great circle is very nearly a straight line anywhere on the chart. Distances and directions can be measured directly on the chart in the same manner as on a Lambert conformal chart.

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American Practical Navigator by N. Bowditch


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