Overview:
In this lesson students will find their own homes on Google maps and
determine their precice latitude and longitude coordinates. They will
learn how to pinpoint the locations visually and then move north, east,
south, or west on the map by changing latitude and longitude values.
1. Explain
to students that when we look up the latitude and longitude for a given
town the coordinates will be centered on a particular place in that
town, such as the post office or government center. (You can find your
town's latitude and longitude using one of the online latitude/longitude
look-up resources.) Using
Google Maps it's possible to find the exact coordinates of
other places such as our school or own homes.
2. Start
by estimating the coordinates of your town using a globe (or map with
latitude and longitude lines). Make your first estimate in whole numbers.
Here's
a example: These are the coordinates you might estimate if you lived
near at the monarch butterfly sanctuaries in Mexico:
- Latitude
= 19 North
- Longitude
= 100 West
3. To use
Google Maps you will need to put your values exactly like this format:
19, -100
Notice
these things: a)
there's comma between the latitude and longitude values, b) we don't
use "North" or "West", and c) the longitude value
is a negative number because it's the western hemisphere.
4. Now
go to Google Maps and put your
latitude and longitude into the search box. Look at the Google map carefully
and figure out which direction you need to move to find your school
or house. (You must use "decimal degree" format*.)
5. You
can move the map north/south by editing the latitude; you can move the
map east/west by editing the longitude. (Let students discover that
the map moves north when you make the latitude higher, south when lower;
west when you make the longitude higher and east when you make it lower.)
6. After
students have learned how to use Google Maps, they can challenge one
another to navigate to a familiar place using latitude and longitude
coordinates. For example, they can find the exact latitude and longitude
of their town library, town hall, a nearby shopping center or favorite
athletic center.