isValid property

True if a SpatialReference can be produced from the current builder properties, false otherwise.

A spatial reference builder is only considered valid if:

• SpatialReferenceBuilder.resolution and SpatialReferenceBuilder.verticalResolution are greater than zero.
• SpatialReferenceBuilder.tolerance and SpatialReferenceBuilder.verticalTolerance are greater than zero.
• SpatialReferenceBuilder.tolerance is at least twice the SpatialReferenceBuilder.resolution.
• SpatialReferenceBuilder.verticalTolerance is at least twice the SpatialReferenceBuilder.verticalResolution.