Turn to page 50 in your notebook. What can you tell me from this image below? There are also copies at your table for you to share!

Global Positioning System (GPS) Global Positioning System is a system of orbiting satellites that send radio signals to receivers on Earth. These receivers calculate a given place’s latitude, longitude, and elevation. Who uses GPS? Mapmakers use GPS to verify the location of boundary lines between countries and states. Airplane and boat pilots use GPS for navigation GPS is used on map apps for our phones, iPads, and computers!

Global Positioning System (GPS)

Geographic Information Systems (GIS) Geographic Information Systems is a computerized system that allows the user to enter different types of information about an area. This information is entered and stored as layers. The user can use the information to make analyses or to display maps. Example: Google Earth

Geographic Information Systems (GIS)

What is topography? Topographic map is a map that shows surface features, or topography, of the Earth. Topographic maps shows both natural features, such as rivers, lakes, and mountains, and features made by humans such as cities, roads, and bridges. These maps show elevation as well. Elevation is the height of an object above sea level. Elevation at sea level is 0 units (feet, meters).

Look again at this topographic map… do you see these features now?

Activity & Materials You will work on this activity individually. Your materials are all at your table (except for your clay). Please note how they are right now so that you can leave it that way at the end of the activity! Materials: 1 container with clay landform (DO NOT TOUCH THE CLAY!) Graduated cylinder with 50 mL of water Transparency Dry-Erase Marker Index card (will be passed out later)

1) Trace Elevation Place transparency on top of container. Looking directly over the container, trace the base (bottom edge) of the clay landscape with dry-erase marker. Label this line at 0 feet, this represents the lowest elevation. Put marker down and sit back, so I know we can go on.

2) Draw Next Elevation Pour 10 mL of water into the container. Make sure to evenly distribute water over landscape. The water line represents a new elevation. Draw your next line (tracing the landscape/water contact). Label this line as 10 ft as shown in the example to the right.

3) Repeat Until Landscape is Fully Submerged Each addition of 10 mL of water will represent another 10 ft. in elevation change, so each line will increase by 10 ft. each time. Your final line will represent the highest peak on your clay landscape. When you are finished, put the cap on your dry-erase marker and the lid back on your container, so I know you are ready to move on.

4) Draw Segment Use your index card as a straight edge for this part. Draw 2 points on opposite sides of your topographic map with your dry-erase marker. Connect the 2 points with a segment. Use your index card to help you make a straight line. Label endpoints A and B. A B

5) Label Elevation on Index Card Mark endpoints on card with a pencil. Then, make a tick mark on your index card at every line and write the elevation next to each. On this picture, how much did the elevation change each time? On your index card, what did yours change by? You will use this for your homework!

Lets put this into your notes! Put all of your materials (container, graduated cylinder, transparency, and dry-erase marker) to the side. We will clean these up later! Keep your index card, but set it aside. You will use it later for your HW! Get your notes sheet out again.

3 Elements of Elevation Contour Lines Contour Interval Index Contour

Contour Lines Contour lines are lines that connect points of equal elevation. Contour lines that are close together show a steep slope. Contour lines that are spaced far apart show a gentle slope.

Contour Interval Contour interval is the difference in elevation between one contour line and the next contour line. On the map to the right, we know 3 elevations. Sea Level = 0 ft. Red Contour Line = 40 ft. Blue Contour Line = 80 ft. So, knowing this information, what would be the contour interval? Contour Interval = _____

Index Contour An index contour is a darker, heavier contour line that is usually every fifth line that indicates a change in elevation. Can you find the index contour lines on the map to the right?

Match Map to Landform!

Exit Slip/Post-Lab When finished with your exit slip, put it in the exit slip folders by the door and pick up your post-lab questions and your vocabulary words sheet. When you are finished with your exit slip, you may work on your post-lab questions since they are due tomorrow!