Standard parallel is that parallel along which the cone touches the globe.

Four types of map projections on the basis of their construction are :

(a) Cylindrical projection (b) Conical projection (c) Zenithal projection (d) Conventional projection.

The developable surface is that which can be cut or unfold into flat sheet of paper e.g. cylinder or cone.

Radius of the globe according to a given scale is calculated on the basis of the following formula :

Radius of the globe = Given R.F. actual radius of the earth.