This is an Isobar Map from the Bureau of Meteorology, Australia. Isobar maps are a form of contouring map. A lines connecting points of equal pressure is called an isobar. That means, that at every point along a given isobar, the values of pressure are the same. Contouring lines:
- are used to represent three dimensional surfaces of the world on a flat map.
- are imagery lines that join equal values of whatever is being mapped.
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