The thinning resolution controls the removal of redundant points from polylines and polygons. Points that deviate from a straight line by less than the thinning resolution are removed. This can significantly reduce the size of a MAP file. We recommend that you set the thinning resolution to 0.02 mm. By default, the thinning resolution is set to 0.05mm. Set resolution to 0.0 to remove colinear points only. To turn off thinning after turning it on, call SetThinRes_MVIEW with a resolution of -1.

public void SetThinRes(
	double d1
)

Public Sub SetThinRes ( 
	d1 As Double
)

public:
void SetThinRes(
	double d1
)

member SetThinRes : 
        d1 : float -> unit