Field Values A field value is any data or measurement that you have plotted on a map EXAMPLES: Elevation (Feet about sea level) Temperature (at different.

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Presentation transcript:

Field Values A field value is any data or measurement that you have plotted on a map EXAMPLES: Elevation (Feet about sea level) Temperature (at different locations) Air Pressure (in different cities)

What are isolines? Lines drawn connecting equal field values Iso means equal Isotherm means equal temperature Isobar means equal pressure Contour lines connect equal elevations

Drawing Isolines

Basic Rules for drawing isolines Isolines must have field values that are evenly spaced. This is called the isoline interval. Isolines can never cross or touch each other Isolines are generally smooth curves that either close in a loop or go off the page

Air pressure isolines

Earthquake Intensity Isolines