IndexSurface WKT表述时由类型关键字INDEXSURFACE、顶点坐标关键字VERTEX以及索引关键字INDEX表示。

VERTEX点坐标之间使用,进行分隔，维度之间使用空格进行分隔，面索引每个面使用()进行包括，索引间使用,进行分隔，形式为：
INDEXSURFACE(
  VERTEX(x1 y1 z1, x2 y2 z2, ....),
  INDEX(
            (i1,i2,i3,...),
        (j1,j2,j3,...),
        ....
     )
  )
示例：
INDEXSURFACE(
  VERTEX(201755.424609375 241700.688720703 7025.00027160645,201755.424609375 241700.688720703 6774.9998336792,202255.431298828 241700.688720703 6774.9998336792,202255.431298828 241700.688720703 7025.00027160645,202255.431298828 243149.418896484 6774.9998336792,201755.424609375 243149.418896484 6774.9998336792,201755.424609375 243149.418896484 7025.00027160645,202255.431298828 243149.418896484 7025.00027160645),
   INDEX((0,1,2),(2,3,0),(4,5,6),(6,7,4),(2,1,5),(5,4,2),(3,2,7),(4,7,2),(0,3,7),(7,6,0),(1,0,5),(6,5,0)))
IndexSurface同样支持Z和M维度信息：
INDEXSURFACE M(
  VERTEX(201755.424609375 241700.688720703 7025.00027160645,201755.424609375 241700.688720703 6774.9998336792,202255.431298828 241700.688720703 6774.9998336792,202255.431298828 241700.688720703 7025.00027160645,202255.431298828 243149.418896484 6774.9998336792,201755.424609375 243149.418896484 6774.9998336792,201755.424609375 243149.418896484 7025.00027160645,202255.431298828 243149.418896484 7025.00027160645),
   INDEX((0,1,2),(2,3,0),(4,5,6),(6,7,4),(2,1,5),(5,4,2),(3,2,7),(4,7,2),(0,3,7),(7,6,0),(1,0,5),(6,5,0)))