A sphere cannot be represented on a flat plane without distortion, which means all map projections distort in one way or another.
球体在平面上不进行扭曲就无法表现出来，这意味着所有制图方式都会以某种方式出现扭曲。
2
The energy minimization characteristic of the harmonic map preserves the low distortion that may yield in the process of texture mapping.
由于调和映射具有保持映射能量最小的性质，该方法可以最小化约束纹理映射可能导致的扭曲形变。
3
Because the traditional SOFM often produce result with color distortion, it setting the map size with different length according to the complexity of images.