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Inconsistencies in official spatial data found in different government organisations and different periods are a commonly known problem and all the attempts to solve it are slow and fortuitous. Differences between data can have an impact on decisions, plans and policies in a country, connected with calculations of land use changes. This article discusses inconsistencies between different official data on deforestation in Slovenia. The authors assess the area of deforestation in the period between 2002 and 2012, with an overlay of vector data from map of Actual Land Use Data Base for 2002 and 2012. The map is managed by the Ministry of Agriculture, Forestry and Food. The assessed area of deforestation is ten times higher than the official value in Slovenia Forest Service annual reports. The causes for such a discrepancy were identified in the survey. An assessment of actual deforestation was done by visual comparisons of orthophoto. The most important causes were: different accuracy of delineation of polygons between land uses and different interpretation of land uses between both years, although the situation in nature remained the same. Assessment of actual deforestation was 14.2% of the initial value. [ABSTRACT FROM AUTHOR]