Transformation service is a tool for geospatial data transformation, which uses existing coordinate transformation service published by Geodesy, Cartography and Cadastre Authority of Slovak Republic. Transformation service is related to the local standard coordinate systems ETRS89 and S-JTSK. Data have to be prepared in a ZIP file and uploaded to the Transformation service interface. Maximum size of a ZIP file is 10 MB. After data upload, the external service provides an URL to download transformed data to the local disc. Detailed instructions for ZIP preparation is available in this HELP.