  This is the preprint version of our paper on ICWL2015. A virtual reality
based enhanced technology for learning primary geography is proposed, which
synthesizes several latest information technologies including virtual
reality(VR), 3D geographical information system(GIS), 3D visualization and
multimodal human-computer-interaction (HCI). The main functions of the proposed
system are introduced, i.e. Buffer analysis, Overlay analysis, Space convex
hull calculation, Space convex decomposition, 3D topology analysis and 3D space
intersection detection. The multimodal technologies are employed in the system
to enhance the immersive perception of the users.
