Isocline Maps

http://www.sciencedirect.com/science/article/pii/S0006320709001517

Isocline maps use continuous lines to join points of the same value, for example, equal altitudes and equal temperatures. The map above is an example of an isocline map. In this case, a computer program was used to show the geographic pattern of flowering of cherry trees that were being monitored produced isoclines.