94 Geometric Dimensioning and Tolerancing Example 3-19. The datum target symbol can be placed on an edge when a surface view is not available, such as point Z1 in this drawing. Note: Datum target point Z1 is located at the edge where datum surfaces X and Z meet. Otherwise, there would be a side view and location dimensions provided. the view where the datum surface is a line and the datum points are located on the surface view of the related datum. The datum target symbol can be placed on the view where the surface appears as an edge if the drawing arrangement dictates such placement, as shown in Example 3-19.