Edit made on November 19, 2008 by RiderOfGiraffes at 14:51:29
Deleted text in red /
Inserted text in green
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.
* Mercator - rhumb lines are represented by straight segments
* Stereographic - shape of circles are conserved
* Hammer projection is an equal-area map projection
* 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. |