Gnomonic
Name | Gnomonic |
Model | Azimuthal |
Type | n/a |
Meridians | Polar: Straight lines radiating from point of tangency Oblique: Straight lines Equatorial: Straight lines |
Parallels | Polar: Concentric circles Oblique: Ellipses, parabolas or hyperbolas concave to poles Equatorial: Ellipses, parabolas or hyperbolas concave to poles |
Spacing Meridian | Polar: Equal and increases away from poles Oblique: Increases very rapidly away from center Equatorial: Increases very rapidly away from |
Spacing Parallels | Polar: Increases very rapidly away from center Oblique: Increases very rapidly away from center Equatorial: Increases very rapidly away from |
Linear Scale | Linear and area distortion are very large away from the center |
Specialties | Straight lines are great circles (unique to this projection) |
Uses | Seismic work (waves travel in great circles) Navigation |
Example |