Isolines

Slope

_a steep, high gradient changes quickly and the isolines are close together -a gentle, low gradient changes slowly and the and the lines are far apart

Rivers

_always flow downhill -will show the direction the river is flowing -when a contour line crosses a river you draw a "V" going the opposite direction of the stream flow

Intervals and isolines

-intervals are equally spaced in a vertical direction. The equal distances between the contours are called intervals -isolines are always closed curves even though the map might only show part of it -an isoline can never cross-this would mean that one point has two different values. Ex: one spot has two temperatures? -Isolines are usually parallel

Contour

Points of equal altitude

Isobar

Points of equal barometric (air) pressure

Isotherms

Points of equal temperature

Isolines

An isoline is a line connecting points of equal value

Depressions and hills

Notice the "different" lines called hachure lines

Drawing profiles

Step 1. Get a piece of paper 2. Line it up under the line x-y 3. Draw tick marks for each instance that a contour crosses the line x-y 4. Label tick marks with the appropriate value 5. Align your scrap paper with the profile as shown above 6. Place a dot on the graph for each of your tick marks at the indicated elevation 7. Connect the dots with a smooth curving line, follow the trend