EBK ELEMENTARY SURVEYING
EBK ELEMENTARY SURVEYING
15th Edition
ISBN: 8220106714225
Author: GHILANI
Publisher: PEARSON
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Chapter 20, Problem 20.34P
To determine

The scale factor used with Lambert conformal conic map projection and Mercator map projection when creating an LDP that is secant to the earth at height of havg .

The expression for scale factor used in Lambert conformal conic map projection is given below.

kLDP=1+havgRE

Here, havg is average geodetic height of the project site, Re is average radius of earth, and kLDP is scale factor used for creating LDP.

In case of transverse Mercator map projection one extra factor k0 , the value of which is 0.9999 , is multiplied to the expression for scale factor used in Lambert conformal conic map projection to increase the precision.

Thus, the expression for scale factor used in transverse Mercator map projection is given below.

kLDP=0.99991+havgRE

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