1. Draw three arrows from small to large along the values of the three axes, as shown in the figure. Don't take the wrong direction.
2. Draw parallel lines. Draw three diagonal lines parallel to the above three arrows and extending in the same direction.
(Note that the direction of parallel lines should be consistent with the arrow! )
Triangulation is a special method of coordinate statistics. It is based on the principle that the sum of the vertical distances from any point to three sides in an equilateral triangle is equal to the three-axis statistical diagram. Therefore, the data expression of three internal structures, such as GDP, is composed of three industry.
Usually, each side of an equilateral triangle is set as the percentage axis according to the unified direction and division. In practical application, two symbol combination design methods can be adopted:
One is to locate the triangle according to the unified three-axis coordinates, and then connect the lines (vertical lines or parallel lines with adjacent sides) from the positioning points, and design the three divided areas into three completely different colors or mesh patterns, and express the distribution characteristics of the data with the structural differences and sizes of the whole figure.
The other is to divide the triangle into different combination types according to the proportion of the three elements in the legend and distinguish them with different colors. Specific dot symbols are represented by the size and color of the type they represent. This method is also suitable for the expression of area symbols.