932 



Subsurface Geologic Methods 



the southeast and northwest corners become 60° in the projection. All 

 north-south and east-west lines are parallel, and scaled distances between 

 map points along these parallel lines are the same as on the map. 

 Scaled distances in any direction except parallel to these lines are either 

 greater or less than those on the map. Obviously then, in order to transfer 

 map information to the projection, it is necessary to do so by means of 

 coordinate measurement. Point a on the map is 10.5 units (any scale) 

 east of the northwest corner of the map and 2.8 units south. Point a 



B 



Figure 497. Stratigraphic isometric-projection drawing. 



