-------- Original Message --------
Subject:        SILS Bulletin 07-04 Map Projections
Date:   Fri, 30 Mar 2007 11:18:59 -0600
From:   Sheryle J Jackson <[log in to unmask]>
To:     maps-l


*SILS Information Bulletin *


*Number: 07-04 Map Projections*
*Date: March 30, 2007*
*Sap # 16573 (for product ordering )*


A long awaited General Interest Publication (GIP) titled, Map
Projections has recently been
reprinted and is available for coming events.

A map projection is used to portray all or part of the round Earth on a
flat surface. This can not be done without some distortion. Every
projection has its own set of advantages and disadvantages. There is no
“best” projection. The mapmaker must select the one best suited to the
needs, reducing distortion of the most important features.

Mapmakers and mathematicians have devised almost limitless ways to
project the image of the globe onto paper. Scientists at the U.S.
Geological Survey have designed projections for their specific needs –
such as the Space Oblique Mercator, which allows mapping from satellites
with little or no distortion.

This document gives the key properties, characteristics, and preferred
uses of many historically important projections and of those frequently
used by mapmakers today.

*Map Projections* is a great learning tool for schools, conferences and
special events. It is offered *free of charge* in limited quantities,
but does come with a $5.00 handling charge for each order mailed. The
poster comes folded and measures approximately 24” x 35”. It is
available from USGS Science Information and Library Services (SILS). To
place an order call the SILS offices at 1-888-ASK-USGS, or visit the
USGS Store at: /_http://store.usgs.gov_/ .


Sheryle Girk-Jackson 303 202 4176, FAX 303 202 4633, email:
[log in to unmask]


Sheryle J. Girk-Jackson
Technical Information Specialist/Business Acquisitions
USGS/ESIC