Pitney-bowes MapInfo Professional Bedienungsanleitung PDF herunterladen (Seite 393)

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Understanding Coordinate Systems

You can make a map out of any globe without distorting the points on the surface by placing the globe

into an imaginary cylinder.

Globe with Longitude/Latitude Projection

If you transfer the touch points from the globe surface onto the cylinder and roll out the cylinder onto

graph paper, the result is a map as in the figure below. In the map that would be created from this cylinder,

the Equator is 0 degrees all the way around the globe and the points on that line are completely accurate.

Longitude/Latitude Projection Map

When you add longitude and latitude lines at 15 degree increments to each side of the Equator and the

Prime Meridian you create a reference grid. The lines furthest from the Prime Meridian are +180 degrees

toward the right and -180 degrees to the left. This map projection is commonly called the

Longitude/Latitude projection.

This is often considered the default projection. It is the most effective map for areas nearest the Equator

but measurements further away tend to increase in distortion.

Because many people do not live near the Equator, other projections came into use to create more

accurate local maps. Accuracy depends upon how you project the globe onto the cylinder. If you turn

393MapInfo Professional User Guide

Chapter 15: Working with Coordinate Systems and Projections

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