1. Basic Shape:
* Outline: Start by drawing the basic shape of the island on your map.
* Sea Level: Draw a line around the island to represent sea level. This is your 0-foot contour line.
2. Contour Lines:
* 80-Foot Contour: Since the island's highest point is 80 feet, draw a contour line that represents that elevation. This line should be entirely within the island's outline.
* Lower Elevations: Draw additional contour lines for elevations of 70, 60, 50, 40, 30, 20, and 10 feet, each line representing a 10-foot decrease in elevation. These lines will be nested within the higher elevation lines, and they will likely have a more irregular shape, reflecting the island's topography.
3. Spacing:
* Closely Spaced: Where the terrain is steep (like a cliff), the contour lines will be close together.
* Widely Spaced: Where the terrain is flatter (like a beach), the contour lines will be farther apart.
4. Labeling:
* Elevation: Label each contour line with its corresponding elevation. You can do this directly on the line or use a small label next to it.
5. Additional Details (Optional):
* Shading: To add depth and visual interest, you can shade the higher elevations of the island.
* Symbols: Use symbols to indicate specific features like trees, beaches, or rocky areas.
Example:
Imagine a small, round island. Here's how the contour lines might look:
* Sea Level: A circle around the island.
* 80-Foot Contour: A smaller circle within the first circle, representing the highest point.
* Lower Elevations: The contour lines for lower elevations will gradually get larger as they approach sea level, reflecting the island's slope.
Remember:
* The closer the contour lines, the steeper the terrain.
* The farther apart the contour lines, the gentler the slope.
This method of using contour lines will effectively represent the elevation of the island and give a visual understanding of its shape and topography.
