In this example, SYMBOL1 defines a text label for the lowest contour level. Each remaining contour line gets the default label, which is the contour variable's value at that contour level. All the ...

Contour lines are lines that join up areas of equal height on a map. ... There are too many features to label everything using text, so we use map symbols.

Geography KS3 & GCSE: Contour lines and gradients. This video clip demonstrates how contour lines can be used to understand gradients. Suitable for teaching geography at GCSE and National 4 / 5.