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.
| |>> IMG:Mercator.png _ Mercator
- _ rhumb lines are represented _ by straight segments | |>> IMG:Strerographic.png
- _ 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. |