Learning Objective Create a topographiccontour map by applying

Learning Objective Create a topographic/contour map by applying the 4 rules for drawing contour lines. Think-Pair-Share: What are contour maps?

Topographic/Contour Map A topographic/contour map is a map that shows the elevation in a region (how high or low the land feature is). It shows features such as mountains, hills, lake, depressions or valleys. This type of map is made up of a type of isoline (line that connects points of the same value) called a contour line. Topographic maps add a third dimension to latitude and longitude by showing natural features on the Earth’s surface-in particularelevation.

Topographic/Contour Map

Isolines An isoline is a line connecting points of equal value.

Examples of Isolines: Isotherms: points of equal temperature Isobar: points of equal barometric (air) pressure Contour: points of equal altitude

Rules for Drawing Isolines: 1. Isolines connect points of equal value. 5 5 10 10 10 15 15

2. Isolines are gentle, curving lines- no sharp corners like you see here. 5 5 10 10 10 15 15

3. Isolines must never simply end- Somewhere usually off the map, the two ends must join to enclose a circular region.

4. Isolines NEVER cross 40 ° 50 ° 30 ° 60 ° X 20° Y Z

Teacher Modeling/Independent Work -Follow along with the power point, to draw the contour lines for this map.

Contour lines are drawn at certain intervals. In this example, 10 m. This means we will connect values that are multiples of ten. Highlight data points for values of ten.

Fill in gaps in data that do not have specific values. 60 m would fall somewhere in between these values.

Connect the dots by drawing a smooth line.

Go on to the next value.

Group Work In groups of three, you will construct a contour map for Peppe town II Independently, draw your contour lines IN PENCIL As a group, compare the contour lines, check each other’s maps for mistakes Create a key/legend for each elevation range; write the legend somewhere on the front of the map. Color-code each area to complete your own contour map.

Sefchek Town II

Reflection: Why are contour lines used? In your own words, describe how you created your contour map.

Homework: Finish completing your contour map. Maps are due Friday, but you will earn 5 bonus points if they are in by tomorrow!

Learning Objective SWBAT: Determine the direction of river flow, the elevation of various locations and the topography of a location by analyzing a map of Lake Lackawanna.

Learning Objective

Contour Rules/Symbols Every map has a contour interval. The value represented by each contour line is always a multiple of that interval. Closely spaced lines=steep slope (gradient) Widely spaced=gentle slope (gradient)

Steep vs Gentle Slope Steeper Slope Gentler Slope

A steep (high) gradient changes quickly and the isolines are close together. A gentle (low) gradient changes slowly and the lines are far apart. Steep area Gentle area

A contour line that closes (makes a complete circle) on the map indicates a hill Hatchures represent a depression (a decrease in elevation). First hatchure= same value as previous contour line Each consecutive hatchure= one contour interval lower

Symbol for and example of hatchures

Direction of River Flow When crossing a stream, the contour bends upwards towards the stream The bend, or “V”, points upstream. The river flows downstream, OPPOSITE THE APEX (opposite the point of the V)

Highest Possible Elevation: The highest possible elevation of this hill is juts below the value of where the next contour line would be. Since there is no contour line for 40 in this example, the highest possible elevation for the star is 39 m. 30 20 10

Gradient (aka slope) A measure of the steepness. Gradient shows how quickly the value changes from one point to another. Vertical Distance (Change in elevationft. ) /Horizontal Distance (miles) = Gradient (ft/mile)

Task Card: Lake Lakawana and Green River 1) Group Work: Complete Lakawana 2) Independent Work: Complete Green River 3) Reflection: When would you want to refer to a contour map? When can they be useful? 4) Extension: Brainstorm regions that

Homework Complete Green River (and Lake Lackawanna) if not completed in class.

Reflection When would you want to refer to a contour map? Why are contour maps useful?