Massive Terrain Data Sharing in Pyramid Hierarchical Peer-to-Peer Networks

Solutions based on peer-to-peer(P2P) technologies to handle server bottleneck in Client/Server mode are promising for heavy terrain navigation in network GIS.However,current P2P methods only consider peers' bandwidth when selecting peers to communicate,and provide inefficient terrain navigation services.Storage characteristics and data spatio-temporal features are taken into account and a P2P hierarchical structure is proposed for the sharing of massive terrain data.Peers are grouped based on their geographical locations.Peers in the same group are hierarchical according to communication delay of each other.Prototype system is designed.The evaluation results show that the proposed method achieves higher data transmission speed and lower tile feedback delay compared to others.