CN101963996A - Global raster data storing method - Google Patents
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Abstract
The invention discloses a global raster data storing method, which comprises the following steps of: reversely computing a remote sensing image to the earth surface; subdividing the earth surface by using a global raster subdivision model; storing the image information by blocks according to the subdivision structure of the raster subdivision model and constructing a hierarchical block-storage raster database; constructing a hierarchical block-storage raster data network according to the hierarchical block-storage raster database and storing the raster data into a corresponding node server in a network, wherein the hierarchical structure of the network corresponds to the hierarchical subdivision structure of the global raster subdivision model. In the invention, the space raster data are deployed into the corresponding node server in the network to form a hierarchical network topology structure which is easy to organize and manage, so that difficulties in data organization and management can be effectively reduced.
Description
Technical field
The present invention relates to technical field of information storage, particularly relate to a kind of global raster data storage means.
Background technology
At present, geographic information system technology is faced with the challenge of construction of massive spatial data storehouse and aspects such as the whole world or big matter of regional significance research.Along with high resolution sensor is launched successively, remote sensing image up to 1 meter even 0.6 meter resolution has dropped into international business market, the remotely-sensed data that ground receives has formed the covering of the global range of multiple resolution gradually, promote the appearance of the global massive spatial data collection of a plurality of the Internet-distributed, as ocean, global land altitude figures (ETOPO5), GTOP30 altitude figures etc.
Traditional space lattice data are divided the map sheet organization and administration by thematic layering.The space lattice data are organized according to map, and to the plane, each figure layer has a spatial frame of reference and system of projection coordinate by certain projection mapping of sphere process, and spatial data is according to file and The Logic of Tasks organization and management.
Because traditional space lattice data are divided map sheet storage data by thematic layering, organize and manage then, make it have following shortcoming at least: (1) space reference disunity, projection deformation is inhomogeneous, cause the basal surface position size distribution of pixel inhomogeneous, the pairing actual face of land of data cell scope exists the bigger shape and the difference of area; (2) spatial data magnanimity exists, and bigger according to the mode difficulty of file and The Logic of Tasks organization and management, operates also more complicated.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the invention provides a kind of global raster data storage means, to solve in the prior art, the basal surface position size distribution of pixel is inhomogeneous to be existed than big-difference with the pairing actual face of land of data cell scope, and the big problem of data organization management difficulty.Technical scheme is as follows:
A kind of global raster data storage means comprises:
With the remote sensing image inverse to earth surface;
Utilize the Global Grid subdivision model, earth surface is carried out subdivision;
According to the subdivision structure piecemeal stored images information of mesh generation model, constitute the raster database of level piecemeal storage;
Raster database according to the storage of level piecemeal, the distributed raster data network of structure level, raster data is stored in the described network in the node corresponding server, and the hierarchical structure of described network is corresponding with the level subdivision structure of Global Grid subdivision model.
The technical scheme that is provided by the above embodiment of the invention as seen, the present invention with traditional remote sensing image inverse to sphere, according to the Global Grid subdivision, provide the whole world unified benchmark, solved the inhomogeneous and pairing actual face of land of the data cell scope of the basal surface position size distribution of pixel and had problem than big-difference; Data storage distributes according to the locus, and form the distributed level network by a plurality of node servers, the space lattice data portion is deployed in the node corresponding server in the network, network topology structure with this level that constitutes is easy to organization and management, can effectively reduce the difficulty of data organization and management.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, the accompanying drawing that describes below only is some embodiment that put down in writing among the present invention, for those of ordinary skills, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the process flow diagram of the embodiment of the invention;
Fig. 2 is the structural drawing of embodiment of the invention virtual network;
Fig. 3 is the process flow diagram of node server routing inquiry in the embodiment of the invention.
Embodiment
In order to make those skilled in the art person understand technical scheme among the present invention better, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtained should belong to the scope of protection of the invention.
The invention provides a kind of global raster data storage means, have problem to solve the inhomogeneous and pairing actual face of land of the data cell scope of pixel basal surface position size distribution, and effectively reduce the difficulty of data organization and management than big-difference.
As shown in Figure 1, global raster data storage means provided by the present invention may further comprise the steps:
S1: with the remote sensing image inverse to earth surface;
S2: utilize the Global Grid subdivision model, earth surface is carried out subdivision;
Select suitable Global Grid subdivision model, as EARPIH, ISEA, SQT, QTM etc., sphere is carried out subdivision, guarantee that data point distribution is even as much as possible, shape is similar as much as possible or equal with area.
S3:, constitute the raster database of level piecemeal storage according to the subdivision structure piecemeal stored images information of mesh generation model;
After finishing, subdivision constitutes the database of level piecemeal storage.A complete data block can take the subdivision structure to store in the raster database, guarantees higher access efficiency by the space fill order.Corresponding several database nodes of several data blocks in the database, each database node is according to the maximum whole world coding name of geographic range that data cover, and this unique name will directly be used for indicating this database node.The locus of database node institute data blocks stored is continuous or overlapping.Ground is learned to calculate usually needs the vector data stack, by setting up the spatial information representation model, vector data directly can be converted to the Global Grid model representation form under the certain resolution, calculates then.Raster database node service software provides by the related service of latitude and longitude coordinates visit data piece.
Wherein, raster database can adopt file system or relation or object relationship database to make up:
(1) if file system, each data block is as a unique file, and each file is named according to respective coding;
(2) for database, can adopt big data field, such as LOB type field and elongated type field etc., store data block.
The major function of raster database comprises: data block store; Data block name and map addresses; Data block access control and renewal and Version Control; Data block information inquiry and transmission etc.The storage of each data block can be adopted according to the subdivision structure organization and comprise the L curve, and space filling curves such as Morton improve access efficiency.
S4: according to the raster database of level piecemeal storage, the distributed raster data network of structure level, raster data is stored in the described network in the node corresponding server, and the hierarchical structure of described network is corresponding with the level subdivision structure of Global Grid subdivision model.
As shown in Figure 2, share virtual network based on distributed, collaborative mutually level of global network model hierarchy structure construction.Whole network structure is corresponding with Global Grid model hierarchy subdivision structure, and node server is according to the maximum global address coding name of geographic range that data cover, and this name will directly be used for this node server in the marked network.Node server institute data blocks stored locus is continuous or overlapping.
Node server geocoding scheme is: 0 grade of subdivision coding, 1 grade of subdivision coding, 2 grades of subdivision codings ... k level subdivision coding.Wherein 0 grade of subdivision coding is different, and there is many levels raster data network in expression, for supporting many network structures, needs 0 grade of data server to preserve the mapping address of other 0 grade of data server.1 grade of subdivision is encoded to the triangle number of the subdivision that adopts, and such as for EARPIH, its value is [n, n+19], and for QTM, its value is [n, n+7].For other subdivision degree of depth t, t level subdivision code value field scope is [n, n+3] (inquartation) or [n, n+8] (rule of Nine).
The concrete corresponded manner of the network structure in the distributed raster data network of this level and the level subdivision structure of Global Grid subdivision model is:
(1) the corresponding top mode server of 0 degree of depth subdivision of global network subdivision model, promptly root node (i) is in charge of global range, trans-regional or very important data;
(2) the image data information of high-resolution is deployed to the downstream site server in some respective secondary zone respectively according to Plato's polyhedron (as regular octahedron or regular dodecahedron etc.), as node (i, 0) node (i, 1) ... node (i, T) be the child node of root node (i), the data message of high-resolution then can be deployed in the corresponding child node corresponding server of root node (i);
(3) when 1 layer or more the deep layer node server reach performance boundary (the data storage capacity limit or calculation services capacity limit), then the data block that just reaches the node server correspondence of performance boundary according to inquartation or rule of Nine is carried out subdivision, make the data message of the sub-piece correspondence of high-resolution data be deployed in the node server of corresponding secondary region, and reach the node server reservation whole area condition of reaction or the important data message of performance boundary according to the transplanting of subdivision scope.The step (3) of carrying out capable of circulation, thus unified, open, the transparent distributed raster data shared network of level formed.
Any one node server is stored the data of certain resolution scope in this scope thus, and more high-resolution data then may be deployed in the node server of bottom.
The technical scheme that is provided by the above embodiment of the invention as seen, the present invention with traditional remote sensing image inverse to sphere, according to the Global Grid subdivision, provide the whole world unified benchmark, solved the inhomogeneous and pairing actual face of land of the data cell scope of the basal surface position size distribution of pixel and had problem than big-difference; Data storage distributes according to the locus, and form the distributed level network by a plurality of node servers, the space lattice data portion is deployed in the node corresponding server in the network, network topology structure with this level that constitutes is easy to organization and management, can effectively reduce the difficulty of data organization and management.
In the distributed virtual network of level that the present invention makes up, node server can be according to inquiry of data server routing to communicate agreement and management raster data.Just, node server can be sought the respective nodes server that meets user equipment requests information, and the respective nodes server returns to subscriber equipment with data message.
Simply introduce data server routing to communicate agreement below, this agreement comprises:
(1) data of storing in the node server comprise two kinds of master datas:
A. grid tabulation, the encoded data set that the record home server is stored;
B. upper level and next stage node server address;
(2) node server address passing service: the digital coding of being asked is not when local grid is tabulated, and the stratum level according to coding turns to this request of data upper level or next stage server automatically;
(3) the buffering grid table data of node server: for the realization network is located fast, buffering mesh column table record digital coding and node server mapping, this tabulation has necessarily ageing, along with the address passing service is upgraded or deletion or increase;
(4) request of data is divided into two steps, at first is the node server address resolution, according to the node server address of returning, carries out data transport service then;
(5) address resolution of node server is returned and can be adopted the XML form;
(6) broadcasting of node server mapping address, when coding upgrades with node server, send mapping address information by home server to topological adjacent server with it, the up broadcasting of upper layer node server then, lower level node server downlink broadcast receives that the node server of message upgrades corresponding buffering grid tabulation.
In order to carry out the routing inquiry service, the geocoding and the network address mapping table of the neighbor node server of self set up and safeguarded to node server, record superior node server, downstream site server and other known node network address of server information.Node server should be implemented to refresh to safeguard mapping table according to the network service state, guarantees up or down that at least (if having topology downwards) exists one or above available link.Address route service among the present invention provides the domain name mapping that is similar to DNS service.Utilize this mechanism, the user can utilize Global Grid geocoding location node server.
Home address encoding model and structure by the identified areas data, services with hierarchical structure, virtual method according to layering and segmentation, give the node server that has the Autonomous Control characteristics in the wide area environment with the regional address coding assignment of data, services, set up dynamic mapping relationship between level.Suppose that present node only has the address of superior node server and downstream site server, and the node address analysis service can be transmitted.Below in conjunction with Fig. 3, introduce the detailed process (node server that institute is directly visited is defined as the local node server) utilize data server routing to communicate agreement routing inquiry raster data:
Step S31: the local node server receives the request of data that subscriber equipment sends;
Step S32: the local node server is converted to geocoding according to the geographical area information in the request of data, and obtains the geocoding of self;
Step S33: whether the request of data that the local node server is judged this subscriber equipment according to request of data corresponding address coding is in self address realm, if return corresponding data information to subscriber equipment; Otherwise enter step S34;
Step S34: whether the request of data that the local node server is judged this subscriber equipment according to request of data corresponding address coding is in self corresponding mapping table, if, request of data is sent to node corresponding server in the mapping table, by node corresponding server in the mapping table to subscriber equipment return data information; Otherwise enter step S35;
Step S35: the local node server judges that according to request of data corresponding address coding described request of data is whether in the address realm of the corresponding downstream site server of local node server, if, request of data is sent in the downstream site server, return corresponding data information by corresponding downstream site server to subscriber equipment, otherwise enter step S36;
Step S36: the local node server is transferred to its superior node server, execution in step S33 with request of data.
By above-mentioned query script as can be known, as long as hierarchical structure keeps being communicated with, then can find any one node server from any one node server.
After node splits, should in time write down each child node server address coding, the freshness map table, downstream site server record superior node server address is encoded simultaneously, to keep whole network address consistance.When the change of the node server network address, will be to adjacent node server issue address lastest imformation.Described node fractionation is meant and then the data block subdivision is obtained a plurality of data sub-block when the capacity of server overflows, and increases the downstream site server, and scope is dropped on the downstream site server that the data deployment extremely increases in each data sub-block.
Like this, set up the network computing environment of sharing, the spatial data supporting is provided at hardware and network level, and keep the independence of logic with spatial data and service itself, thereby provide unified, transparent visit and administrative mechanism at high level, keep the spatial data service dynamically to dispose and management simultaneously according to the change of demand.The network topology structure of bottom can dynamically change like this, and transparent fully to the spatial information application on upper strata, can reach the highly scalable that system architecture and data are disposed.
In the method for the present invention, the user not only can the search space data, but also can carry out corresponding modification.By data query and control interface, the user can inquire about the data source of earth arbitrary region, and is appointed as the data manipulation source, also can produce new data.The concrete storage of data is user transparents, and general user does not have the authority of control data storage, but data point is had the right of visit and modification.Calculate the user interface research model by modeling and science, related science calculating is carried out in user's modeling easily, and does not need to carry out the pretreated complicated processes of traditional Geographic Information System (GIS) data.Can directly carry out as giving an order such as the user: making the soil moisture data longitude and latitude of 10 meters resolution of x month x day in 2004 is (30 ° of E, 60 ° of N) pixel value is 8, computing environment will be according to time (x month x day in 2004), main key word (soil moisture, 10 meters resolution) and geographic position (30 ° of E, 60 ° of N) find corresponding back end, data block and respective pixel, the operation of making amendment then successively.This mode has avoided the traditional approach problem, the problem includes: several problem: data search, data repeated storage, loaded down with trivial details data pre-service and file direct control etc.And this mode is by the centralized and unified management common data, and researcher's modification process all is transparent, and therefore a kind of environment of collaborative work is provided.
What need describe is to comprise the metadatabase that several have hierarchical relationship in the raster database, the image data information of metadatabase storage certain limit.The metadata standard of described metadatabase and traditional space element data standard are slightly variant, and main metadata elements comprises raster database node identification (being the unique name of database node), and data block corresponding codes and resolution.By these three key elements, can uniquely determine a data block.This metadatabase provides the user data search service based on spatial dimension.The user carries out data access by specifying latitude and longitude coordinates and data resolution to call, and data selected is carried out operation based on data point.Notice that data point is a relative notion, it is relevant with the operation specified resolution, can refer to a pixel of True Data, also can the corresponding pixel unit of living in concentrated communities more than.By location-based intelligence coupling of data point and mapping service, can find this data point place database node and corresponding data block automatically.It is provided by the invention that visual service comprises 3-D display and different Projection Display etc. with data-switching.
In sum, utilize the Global Grid model construction newly to learn to calculate and modeling environment has the unexistent advantage of traditional geographic information system technology:
1) can provide the abstractness of calculating, computing unit develops into discrete pixel under the certain resolution by traditional file;
2) can keep the topological integrality of spatial object, no longer be torn because of projection;
3) most of computation process is based on the integer calculations algorithm, the efficient height;
4) can handle connectedness, distance, contiguous problem etc., unlike traditional algorithm, need the special consideration limit;
5) can obtain data fast, the volume inside index structure helps improving the search efficiency of position-based and size;
6) support multiresolution;
7) be beneficial to distributedly browse, dynamic transmission and rendering technique;
8) help improving the quality of image;
9) support better interactive browser mode, do not need to be the interactive browser global metadata collection data source that remaps.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
The present invention can be used in numerous general or special purpose computingasystem environment or the configuration.For example: personal computer, server computer, handheld device or portable set, plate equipment, multicomputer system, the system based on microprocessor, set top box, programmable consumer-elcetronics devices, network PC, small-size computer, mainframe computer, comprise distributed computing environment of above any system or equipment or the like.
The present invention can describe in the general context of the computer executable instructions of being carried out by computing machine, for example program module.Usually, program module comprises the routine carrying out particular task or realize particular abstract, program, object, assembly, data structure or the like.Also can in distributed computing environment, put into practice the present invention, in these distributed computing environment, by by communication network connected teleprocessing equipment execute the task.In distributed computing environment, program module can be arranged in the local and remote computer-readable storage medium that comprises memory device.
The above only is the specific embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. a global raster data storage means is characterized in that, comprising:
With the remote sensing image inverse to earth surface;
Utilize the Global Grid subdivision model, earth surface is carried out subdivision;
According to the subdivision structure piecemeal stored images information of mesh generation model, constitute the raster database of level piecemeal storage;
Raster database according to the storage of level piecemeal, the distributed raster data network of structure level, raster data is stored in the described network in the node corresponding server, and the hierarchical structure of described network is corresponding with the level subdivision structure of Global Grid subdivision model.
2. method according to claim 1 is characterized in that, described node server is according to the maximum global address coding name of geographic range that data cover.
3. method according to claim 2 is characterized in that, the hierarchical structure of described network is corresponding with the level subdivision structure of Global Grid subdivision model, is specially:
The corresponding top mode server of 0 degree of depth subdivision of Global Grid subdivision model;
The image data information portion is deployed to the downstream site server in respective secondary zone according to Plato's polyhedron.
4. method according to claim 3 is characterized in that, describedly according to Plato's polyhedron the image data information portion is deployed to the downstream site server in respective secondary zone, is specially:
The data block that will reach the node server correspondence of performance boundary is carried out subdivision, obtains a plurality of data sub-block;
The image information that data sub-block comprised is transplanted the node server that is deployed to corresponding secondary region according to the subdivision scope;
Wherein, partition patterns comprises: data block one is divided into four inquartation or data block one is divided into nine rule of Nine;
Described performance boundary comprises: the data storage capacity limit or the service ability limit.
5. method according to claim 2 is characterized in that, the geocoding and the network address mapping table of the neighbor node server of self set up and safeguarded to node server, and described mapping table upgrades automatically;
Wherein, the neighbor node server of node server comprises; The superior node server of this node server and/or downstream site server.
6. method according to claim 5 is characterized in that, also comprises: described node server is sought the respective nodes server that meets user equipment requests information, and the respective nodes server returns to subscriber equipment with data message.
7. method according to claim 6 is characterized in that, described node server is sought the respective nodes server that meets user equipment requests information, and the respective nodes server returns to subscriber equipment with data message, specifically comprises:
Steps A 1: node server receives the request of data that subscriber equipment sends;
Steps A 2: be converted to geocoding according to the geographical area information in the data service request;
Steps A 3: judge described request of data whether in the address realm of this node server according to geocoding, if, return corresponding data information to subscriber equipment, if not, execution in step A4 then;
Steps A 4: judge that according to geocoding described request of data is whether in the node server corresponding mapping table, if, then request of data is sent to node corresponding server in the mapping table, by node corresponding server in the mapping table to subscriber equipment return data information, if not, then enter steps A 5;
Steps A 5: judge that according to geocoding whether described request of data is in the address realm of the corresponding downstream site server of described node server, if, then request of data is sent to corresponding downstream site server, return corresponding data information by corresponding downstream site server to subscriber equipment, if not, execution in step A6 then;
Steps A 6: request of data is transferred to the corresponding superior node server of described node server, execution in step A3.
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