Abstract: A data network in which real time data from sensors is collected by local data servers and transmitted to a global data server. A number of virtual servers hold subsets of real time data from the global data server. Domains of data clients have real time access to a virtual server such that data clients may not access data to which they do not have permission to access.

Abstract: A method and system 13 for processing graphical data for transmission to a remote computer 15 via a data network 17, the graphical data representing an image or graphical model the display of which can be manipulated from the remote computer in real-time in accordance with control commands, for example in response to keyboard or mouse inputs 47. The method/system involves receiving, from the remote computer, image quality settings associated with respective manipulation modes. A current manipulation mode is identified based on control commands received from the remote computer, for example in response to detecting whether or not a user is interacting with the image or model. The graphical data is then processed in accordance with the image quality settings for the identified current manipulation mode to generate an updated image or set of images for transmission to the remote computer.

Abstract: A method and system 13 for processing graphical data for transmission to a remote computer 15 via a data network 17, the graphical data representing an image or graphical model the display of which can be manipulated at the remote computer in real-time in accordance with control commands, for example in response to keyboard or mouse inputs 47. The method/system involves receiving, from the remote computer, image quality settings associated with respective manipulation modes. A current manipulation mode is identified based on control commands received from the remote computer, for example in response to detecting whether or not a user is interacting with the image or model. The graphical data is then processed in accordance with the image quality settings for the identified current manipulation mode to generate an updated image or set of images for transmission to the remote computer. The processing involves using a compression algorithm to generate data representing a plurality of image layers L1 . . .