Field Maps Aim: What are fields?

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

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

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

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.

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.

Topographic Maps

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.

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? ___________

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.