Standard reference datums

RD

Point

Reference Datum:

a simple geometric construct in position-space that can be bound to

object-space.

XZ-plane

Directed Line

Plane

Ellipsoid RD

Origin

Y-axis

(0, 0, 0)

X-axis

F(t)=(0, t, 0)

F(t)=(t, 0, 0)

Z-axis

F(t)=(0, 0, t)

OBE

Etc.

Sphere

PRS

Oblate

Ellipsoid type:

semi-major axis,

flattening, date

Sphere

type:

radius,

date

Prolate

Ellipsoid

type

Airy 1830

Clark 1880

North American 1983

WGS84 Ellipsoid

International 1924

Etc.

NOGAPS

MM5

MODTRAN Mid Latitude

Reference Spheres

and Ellipsoids

Etc.

Oriented surface

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