ABSTRACT
A l l the possible methods of obta ining projections are based on solving direct
and inverse problems of mathematical cartography.
The general equations for map projection, as noted above, have the fo rm
x = /i(0, A), y =/2(</>, X)
Functions f u f2 are obtained i n accordance w i t h the in i t i a l requirements or
condit ions imposed. They are called the t ransformation functions, and their applica-
t i on makes i t possible to determine the part icular formulas for local scale factors
and other project ion characteristics based on the equations of the general theory
(see section 1.3).