Deleted text in red / Inserted text in green

WW

HEADERS_END

Map makers want to make maps that do three things (amongst others):

* Preserve angles – to determine direction of travel

* Preserve relative areas – to compare land measurements

* Preserve relative distances – to estimate time of travel

Unfortunately no map can simultaneous have all three so maps can only approximate the real geometry of a curved surface.

Map making, therefore, is a compromise so there are many different named projections.

Here are a few.

IMG:Mercator.png

* Mercator - rhumb lines are represented by straight segments

IMG:Strerographic.png

* Stereographic - shape of circles are conserved

IMG:Hammerprojection.png

* Hammer projection is an equal-area map projection

IMG:Conical.png

* Conical Gnomonic projection - gnomonic projection displays all great circles as straight lines.

|>>

| |>> IMG:Mercator.png _ Mercator _ rhumb lines are represented _ by straight segments | |>> IMG:Strerographic.png _ Stereographic _ shape of circles _ are conserved |

| |>> IMG:Hammerprojection.png _ Hammer projection is an _ equal-area map projection | |>> IMG:Conical.png _ Conical Gnomonic projection _ displays all great circles as straight lines. |

<<|