1. 1National Agricultural Research and Innovation Center, Institute of Agricultural Engineering, Tessedik Sámuel Street 4, H-2100 Gödöllő, Hungary
2. 2Research Institute of Agricultural Engineering, p.r.i., Drnovská 507, 161 01, Prague 6, Czech Republic
3. 3Eötvös Loránd University, Faculty of Informatics, Institute of Cartography and Geoinformatics, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary