In order to ensure operation of the Cadastre, the Cadastre information system is being maintained and improved. Cadastre text and spatial data regarding cadastre objects, which are located in the territory of Latvia, are registered and maintained in the Cadastre information system. In order to specify the value of particular cadastre object, four models of cadastral assessment are developed. These models provide cadastral assessment of all cadastre objects registered in the Cadastre information system. Cadastral assessment models are approved by regulations of Cabinet No.305, adopted 18 April 2006 “Regulations regarding Cadastral Assessment”, and they are: * model of the cadastral value for building land; * model of the cadastral value for the rural land of the rural area; * model of the cadastral value of a building; * model of the cadastral value of an engineering structure. For calculation of the cadastral value the following data registered in the information system of Cadastre are used - cadastral value base, data characterising cadastre object, purposes of use and encumbrances. Main conclusion of the research is - in models of cadastral assessment cadastre data are very important. Because cadastral value have to be calculated for 1.3 million cadastre objects, the quality and actuality of cadastre data is very important.