Projection

Projection

1. What it is

   • Geographic
   • Global coordinate system
   • Represents a curved surface on a flat surface

2. Types

   • Cylindirical
     • Coordinates circumferencing the equator
     • 360x180 boxes
     • GMT intersects with line
     • Distortion near the poles
     • Mercator map
   • Conical
     • intersect along transverse
     • minimises distortion
     • 180-180 degree
     • Lambert projection
       • apex placed on the axis of the north pole for a n-hem
   • Azimuthal
   • Conformal
     • Lines intersect at 90d
     • Same scale from any direction
     • Preserves the shapes of small areas
   • Secant
   • Transverse
     • Orientation along the meridian
     • Split into 60 UMT zones
       • 6d therefore every spot is 3d of the tangent line
     • Distortion further E or W
   • Oblique
     • Tangency that is off from either the equator, or pole
   • Equivalent
     • Maintains scale along more than one line, from more than one point- equal distance
   • Compromise
     • Characteristics such as scale and size are balanced to best illustrate area