32 results about "Tile Map Service" patented technology

The invention discloses a map service static caching local dynamic update method applicable to on-line edit. The map service static caching local dynamic update method applicable to on-line edit comprises the steps that (1) the organization mode of map service static caching files is defined, and a server caching with a layered and segmented map service is generated; (2) monitoring on on-line edit events of map elements is carried out, user edit block information and map service information of the user edit block information are captured in real time, and an edit and update request is sent to a map service static caching server; (3) the map service static caching server receives the edit and update request to carry out a local caching replacement operation; (4) a client browser learns about a replacement accomplishment message of the map service static caching server, and carries out a caching refresh operation. The map service static caching local dynamic update method applicable to on-line edit maintains synchronism and consistency reflected by map data after edit and web publishing, automatic interactive computer processing is carried out on the premise that a map data edit operation is not influenced, working efficiency is improved, and the map service static caching local dynamic update method applicable to on-line edit is quite wide in application prospect of the field of space information map service publishing, and can meet the actual service requirements for frequent edit of space data.

The present invention is applicable to the field of geographic information systems, and provides a method and device for displaying an extended tile map in a WebGIS environment. The method includes: obtaining original tiles, calculating the clipping target range, clipping pictures, zooming to the target size, and target tiles. Steps such as slice rendering, drawing and displaying. The present invention uses the existing cached tile cache data set as a data source, and when the zoom level exceeds the maximum preset level of the pyramid, the target tile data exceeding the pyramid level in the tile map service is reconstructed through calculation, and then rendered and displayed , there is no need for service publishers to continue to plan larger-scale slice data, the entire implementation process is simple, low-cost, and effective.

The invention discloses a method for dynamically selecting an online tile map server based on client monitoring. After numbering several tile map servers that provide the same service content at the server end, they are stored in the form of a circular linked list, and the circular The information of the linked list is compiled into an interface and exposed to the client. When the client in C / S mode starts to request to download the online tile map, calculate the average speed v of downloading tiles from a tile map server to the local within the specified time t in a multi-threaded environment, and the v value is related to the user Compare and analyze the highest authority speed v1 and the lowest authority speed v2, and judge whether it is necessary to switch to other tile map servers. The invention realizes the function of adjusting the load balance of the server on the client side, and reduces the calculation burden of the server. When the user accesses a large amount of data, parameter control can be used to ensure the download speed of users with different permissions, which improves the operating efficiency.

The invention discloses a marine environmental prediction product parallel processing method applied to tiled map services. The method comprises the following steps that (1) the longitude and latitude of metadata of a marine environmental prediction product are read, a WGS84 coordinate is converted into a WebMercator projection coordinate; (2) a data depth layer is cut into n parts according to the kernel number of a parallel machine, an MATLAB parallel strategy is designed; (3) a map grading number is set; (4) according to the current map level interpolation, an MATLAB drawing instruction is used for generating graded section files; (5) drawing of all parameters of the current map grade is completed; (6) an LOD mode is used for organizing the section files, and drawing of all parameters of all grades is completed; (7) after all parallel computers complete processing, metadata are generated. The marine environmental prediction product parallel processing method applied to tiled map services has a good application prospect in the informatization research field of marine environmental sciences. According to the method, a parallel computing technology is used for guaranteeing quick processing of marine environmental prediction data, and the release cycle of the tiled map services is shortened.

A system includes a server including a map data storage device storing original tile map data, grayscale image tile map data, and a plurality of multi-resolution color image tile map data having a resolution lower than that of the grayscale image tile map data, and a multi-resolution tile map data generation and transmission device generating the grayscale image tile map data and the multi-resolution color image tile map data and storing the generated data in the map data storage device, and a client including a multi-resolution tile map data reception and fusion device generating color tile map data by fusing the received grayscale image tile map data and color image tile map data and providing the color tile map data to a user, in which the resolution of the color image tile map data transmitted from the server is variably controlled according to the network environment.

The invention provides a mass small tile file storage management method based on hadoop. According to the method, sequencing is carried out through a Hibert curve, and then, grid tile data is subjected to serialization compression storage by a Sequence File technology of the hadoop pre se; when tile compression blocks are generated, the multithreading parallel compression of a plurality of servers is realized, tile index information is generated, and the mass file library entering storage speed is accelerated; the regular naming of block file names is managed, and efficient storage, fast reading and high-performance grid data service can be provided for mass multi-source and multi-version grid small tiles; and ITMS (Improved Tile Map Service) is designed, and the problem of delay and bandwidth occupation caused by original data transmission and real-time data processing request responding, so that the project data retrieval and transmission requirements are met.

The invention discloses a high-efficiency electronic-map lettering interaction method which includes the following steps: extracting position information of lettering in electronic maps of different measuring scales; extracting geographical element attribute information and position information related with the lettering and storing the information as a formatted text; adopting an indexed mode identical with that of a tilemap and performing classification and partition slicing on the formatted text and storing generated tile files in a text method, wherein the content of the files is lettering and related attribute information in a geographical range which is covered by corresponding map picture slices; adopting a tilemap service interface to provide a map lettering text tile access service of a server side; accessing map lettering text tiles through the service interface or accessing an offline tile file directly and analyzing lettering range information and related element information in the tiles by a client; and realizing visualization and interaction functions of lettering information by the client. The high-efficiency electronic-map lettering interaction method is capable of rapidly responding to operations of users on text lettering and signs in an electronic map and providing corresponding information service and interaction interface.