1. Field Maps
Aim: What are fields?

2. I. Field
A region of space in which the same quantity can be measured everywhere.

3. II. Isolines
Isotherms- lines that connect points of equal temperature.
Isobars- lines that connect points of equal pressure
Contour Lines- lines that connect points of equal elevation

4. III. Topographic Maps
These maps show a three dimensional surface on a two dimensional page.

5. IV. How to Read a Topographic Map
Contour Interval- the number that each contour line is separated from the next in elevation.
Slope of the Land- where the contour lines are close together, the slope is steep. Where there are wide spaces between contour lines, the land is more flat.

6. Reading a Topographic Map Continued…
C. Hills- when contour lines form an enclosed shape that is something like an irregular circle, the center of the enclosed area is usually a hill. The top of the hill is within the smallest circle. D. Depression- a dip in a topographic map. To distinguish a depression from a hill, the contour lines have small bars that point down toward the center of the depression called hachure lines.

7. Topographic Maps

8. E. Running Body of Water- when contour lines cross over a river or stream, they point upstream or the opposite of the direction of flow.

9. F. Highest possible elevation of a hill- it can be calculated by finding the last (highest) contour line on the hill, and then figuring out the next line that would be drawn and subtracting 1.
Example- Using the Mill River map, what is the highest possible elevation of the hill that has point Z? ___________

10. G. Determining Distance- You must use the map scale
G. Determining Distance- You must use the map scale. Find the two locations on the map and line a scrap piece of paper to their points. Make a mark on your scrap to represent each of the two points and then line your paper up along the map scale to calculate the distance.