Method and device for reading and processing raster data

A raster data and processing method technology, applied in the field of spatial information services, can solve the problems of low system response speed and low efficiency of obtaining raster data, and achieve the effects of improving response speed, improving data processing efficiency, and saving system resources

Active Publication Date: 2013-03-13
BEIJING DATUM TECH DEV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a raster data reading and processing method and device

Method used

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  • Method and device for reading and processing raster data
  • Method and device for reading and processing raster data
  • Method and device for reading and processing raster data

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Embodiment Construction

[0050] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] refer to figure 2 , which shows a schematic flowchart of a method for reading and processing raster data according to the present invention, which may specifically include:

[0052] Step 110, according to the size of the grid block data in the raster data file, pre-allocate the cache in the server as N cache grid blocks for storing N grid block data, and use the identification number to record each cache grid block The starting address of the grid block; the N≥2;

[0053] In this embodiment, the cache can be pre-determined by the server’s raster data service program to determine the total size of the cache used for raster data processing, and then these caches are divided into the entire The cache needs to be divided int...

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Abstract

The invention provides a method and device for reading and processing raster data, and relates to the technical field of space information services. The method comprises the following steps of separating a buffer into N buffer raster blocks in a server in advance, wherein the N buffer raster blocks are used for storing data of the N raster blocks; according toiming at the N buffer raster blocks, building a memory database, and generating a corresponding memory recording table, wherein the memory recording table is used for recording the use information of each buffer raster block; then, receiving a request for reading raster data from a client; and inquiring the memory recording table to judge whether the requested raster block data exist or not, wherein, if the requested raster block data exist, reading the raster block data are read from the buffer raster blocks and returneding the raster block data to the client, and if the requested raster block data do not exist, extracting the corresponding raster block data are extracted from a disc, and are storeding the corresponding raster block data into an empty buffer raster block or are alternatively selecteding to enter one buffer raster block, updating the records in the memory are updated, and returning the raster block data are returned to the client. The method and the device have the advantages that the processing efficiency of the raster data is improved, and the system resource is saved.

Description

technical field [0001] The invention relates to the technical field of spatial information services, in particular to a method and device for reading and processing raster data. Background technique [0002] The data structure based on the raster model is referred to as the raster data structure for short, which refers to dividing the space into regular grids and becoming raster data blocks, and giving corresponding attribute values ​​on each raster data block to represent geographic entities. A form of data organization. Because the raster data structure is relatively simple, and the spatial analysis and simulation of geographical phenomena are relatively easy, it is beneficial to the matching application and analysis of remote sensing data, the output method is fast, and the cost is relatively low, so it is widely used in geographic information systems (Geographic Information System, GIS). [0003] However, in the application of geographic information systems, it is ofte...

Claims

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Application Information

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IPC IPC(8): G06F17/30
Inventor 孙成宝
Owner BEIJING DATUM TECH DEV
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