21 Lambert's Conformal Projection

Question 1

On a Lambert’s Conformal chart, what is the Constant of the Cone?

Answer 1

Sin(Po)

Po = Parallel of Origin

Question 2

On a Lambert’s Conformal chart, what is the Convergence Factor?

Answer 2

Sin(Po)

Aka Constant of the Cone

Question 3

On a Lambert’s Conformal chart, describe a Standard Parallel

Answer 3

• Standard Parallel is a point of contact between the projection and the globe
• A Lambert’s Conformal projection has 2 Standard Parallels
• At each Standard Parallel the Scale is correct

Question 4

On a Lambert’s Conformal chart, where is the Parallel of Origin (Po) found?

Answer 4

Directly in between the two Standard Parallels

Question 5

On a Lambert’s Conformal chart, what happens to the Scale in relation to the Standard Parallels?

Answer 5

• In between the Standard Parallels the Scale Contracts

- Outside the Standard Parallels the Scale Expands

Question 6

On a Lambert’s Conformal chart, in order to keep the Scale Contraction/Expansion below 1%, what is the max latitude between the 2 Standard Parallels?

Answer 6

16 degrees

Question 7

On a Lambert’s Conformal chart, what is the equation for the Chart Convergence?

Answer 7

Chart Convergence = Ch.Long (degrees) x Sin (Po)

Question 8

On a Lambert’s Conformal chart, how does the relationship between Chart Convergence and Earth Convergence change in relation to the Parallel of Origin?

Answer 8

• At the Po, CC = EC
• At higher latitudes above Po, CC < EC
• At lower latitudes below Po, CC > EC

Question 9

On a Lambert’s Conformal chart, how are Rhumb Lines and Great Circles displayed?

Answer 9

• Rhumb lines are curved lines, Concave to the nearest pole
• Parallels of latitude, which are arcs of concentric circles, are Rhumb Lines
• Great Circles are complex curves, Concave to the Po
• At short distances they are assumed to be straight lines