What is the difference between a Notice of Valuation and an Assessment Notice and how often should I get them?

A Notice of Valuation states the unimproved value of the property. This is sent to the landowner/person in possession only when properties are re-valued. 

An Assessment Notice states the amount of Property Tax to be paid and this is sent annually to the landowner/person in possession. 

Whenever a re-valuation takes place, landowners will receive both Notices.