Projections I

Mills College 2009

SOC128 Geographic Information Systems and Sociological Geography

Outline

• What do you need to know going forward• Projections and coordinate systems

The Problem

http://publib.boulder.ibm.com/infocenter/dzichelp/v2r2/topic/com.ibm.db29.doc.spatial/csb3022a.htm

The Problem

• A “rectangle” on the earth’s surface…• …that is, a four cornered area aligned with

parallels and meridians

Awest, Bnorth Cwest, Bnorth

Awest, Dnorth Cwest, Dnorth

The Problem

Consider 2 Square Areas on a Map

Both are 1 unit x 1 unit

0

3

2

1

0

321

Credits