MR. WOMACKGEOGRAPHY

Maps and Globes

Maps and Globes

A globe is a three-dimensional representation of the earth. It provides a way to view the earth as it travels through space.

Maps are two-dimensional graphic representations of selected parts of the earth’s surface.

What is this map showing us?

And this one?

Advantages and Disadvantages

Globes show the earth’s true shape, but they are not very practical because they are not easily portable.

Maps are easily portable, and can be drawn to any scale needed. However, distortion can occur because the earth’s surface has been distorted to create the map.

Who makes maps?

Cartographers- or mapmakers, make maps and must update them to reflect political and environmental changes to the globe.

They also use something called map projection to reduce distortion by presenting a round earth on flat paper.

Types of Maps

Topographic- Represents natural and man-made features on the earth.

Political-Show boundaries set up by governments. These boundaries are not always physical.

Thematic-they emphasize specific kinds of information such as climate or population.

Navigation-Used by sailors, pilots, and geo-cachers.

Thematic Map

Topographic Map

Political Map

Navigation Map

How a map is made

Surveying- The first step in making a map is to complete a field survey.

Surveyors observe, measure, and record what they see in a specific area.

Most data for maps today is gathered by remote sensing.

Satellites are used a lot to provide Geographic data.

Types of Satellites

The two major satellites used are Landsat and GOES.

Landsat is a series of satellites that orbit more than 100 miles above earth.

Each time a satellite makes an orbit, it picks up data in an area 115 miles wide.

Landsat can scan the entire earth in 16 days.

Landsat Satellite

Our own state of Utah as seen from the Landsat Satellite from space.

What does this map show you about Utah?

GOES

Geostationary Operational Environment Satellite (GOES) is a weather satellite. This satellite flies in sync with the earth’s rotation.

By doing so, it always views the same area.

It gathers images that are useful in forecasting the weather.

GOES image of the U.S.A.

GIS

Geographical Information Systems or GIS stores information about the world in a digital database.

GIS has the ability to combine information from a variety of sources and display it in ways that allows the user to visualize the use of space in different ways.

Maps with special features are made with this system.

GPS

Global Positioning Satellite or GPS has the ability to tell you exactly where you are on the earth’s surface.

24 satellites called Navstars give users latitude, longitude, altitude and time on a handheld receiver.

Has anyone geo-cached before?

Activity

Look at two maps in the room.Answer the following questions:What type of map is it? (Topographic,

Political)To you, what is the most important feature

on the map? (your own opinion)Why do we make maps? Talk to one other person in the class.

Compare your answers and then tell me which map you feel is better topographical or political. Also tell me why you feel that way.