Defining a CanonicalLocal Tangent Plane SRF

• A local tangent plane is defined at the point p.

• Orthogonal x-y axes are defined at p and the normal to the local surface is used to define the z axis.

• The resulting rectangular system is called a Local Tangent Plane (LTP) coordinate system.

• If the surface is an ERM and the y axis is defined to point to true north (the pole) the resulting system is a Canonical LTP (CLTP) spatial reference frame.

• A linear vector space can be associated with a CLTP.

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