ทิศทางลม การเปลี่ยนแปลงสถานะในจำนวน ลักษณะ และตำแหน่งขึ้นอยู่กับความเร็วลม
What else can be used to visualize wind on a map aside from arrows and barbs? You might sometime come across a very interesting method of showing wind using isolines. Essentially, wind direction and velocity can be depicted with isolines connecting points of equal value. The direction isolines are called “isogons” and the velocity isolines are called “isotachs.” The term “isogon,” which actually refers to any line that depicts the angle of something, not just wind. When a map has many isolines, a hierarchy of symbols can be used in order to more clearly delineate the information by means of a thicker line for every fifth or tenth isoline and labeled with the appropriate value. For smaller scale maps you can show just the major intervals — all of which should be labeled — in order to avoid cluttering the map. These lines are typically black or blue, though gray might be a nice choice as well.