# UW-Madison GEOG 370 - Projection Mechanics and Distortions (5 pages)

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## Projection Mechanics and Distortions

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## Projection Mechanics and Distortions

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Lecture that covers basic map projection mechanics, such as aspect and centering along with the types of distortions

Lecture number:
3
Pages:
5
Type:
Lecture Note
School:
Course:
Geog 370 - Introduction to Cartography
##### Introduction to Cartography Documents
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GEOG 370 1st Edition Lecture 3 Outline of Last Lecture I Map projections from a round earth to a flat map a Background from a round earth to a flat map b Map projections the basics II Map projection mechanics a Class b Case Outline of Current Lecture II Map projection mechanics a Aspect b Centering III Map projection distortions Current Lecture Quiz 1 o Distance between lines of longitude remains constant at every line of latitude true or false o Line depicting shortest distance between two points multiple choice Map projection mechanics o Guidelines for matching classes with regions Use a cylindrical projection with equatorial regions Conic for mid latitudes like the U S Planar for polar regions o Guidelines for matching cases with map extents Tangent cylindrical and conic projections or secant planar projections place single standard line in center For secant cylindrical conic place the pair of standard lines 1 3 1 3 1 3 o Aspect the orientation of the developable surface to the reference globe Impacts the position of the standard lines and therefore the pattern of distortion across the map Aspects of developable surfaces 3 Normal a map projection with a developable surface that is oriented according to the earth s axis of rotation These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o Note descriptions of class and case above assume normality a normal aspect results in standard parallels or standard lines that run along parallels o The standard point is at the north or south pole for a normal tangent planar projection Transverse a map projection with a developable surface that is oriented 90 degrees from the axis of rotation o A transverse aspect results in standard meridians or standard lines that run along meridians tangent cylindrical projections only o Example UTM universal transverse Mercator coordinate system A system of 6 degrees longitude zones in a secant

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