The real world. Views to the real world. Knowing the real world. Informatics, geoinformatics, spatial information technology, mobile geoinformation technologies. Past, present and future of geoinformatics. Data, information, knowledge. Metadata. Spatial data, geodata. Space. Different concepts of space. Positioning in space. Time. Positioning in time. Feature. Components of the description of spatial objects. Spatial modeling of the real world. Acquisition of geodata. Geoinformation technologies: GIS, remote sensing, GPS, DTM, MGIT, GeoWeb, lidar. Use of GIS in construction.