Distributed algorithm for quickly establishing massive remote sensing image pyramid
A pyramid algorithm and remote sensing image technology, which is applied in the intersection of geographic information and information technology, can solve the problems of image block files crossing grids and "black borders"
Inactive Publication Date: 2012-05-09
EAST CHINA NORMAL UNIV
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Problems solved by technology
[0008] The technical problems to be solved in the present invention are: how to divide the N*M grid, how to create a pyramid task assignment and scheduling and create a pyramid, how to correctly divide the grid and calculate the grid information, and solve the image block file Related technical problems such as "black border" caused by crossing the grid
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Embodiment 1
[0217] An algorithm for quickly building a pyramid based on distributed massive remote sensing images proposed by the present invention is implemented in a "massive image data management system". Embodiment 1 is written in C# language, relying on the read and write operations of GeoTIFF and other file formats provided by the open source geographic data abstraction library (Geospatial Data Abstraction Library, GDAL). Among them, the communication between the control node and the computing node and the remote procedure call adopt the windows communication protocol (Windows Communication Foundation, WCF) mechanism provided by the .net framework. The instance runs in a cluster environment consisting of a control node and 5 computing nodes connected by Gigabit Ethernet. The hardware configuration of the node is shown in Table 1 below:
[0218]
[0219] Table 1
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The invention relates to the cross field of geographic information and information technology, in particular to a distributed algorithm for quickly establishing a massive remote sensing image pyramid applied to the construction of National Spatial Data Infrastructure. The method realizes the algorithm for quickly establishing the massive remote sensing image pyramid by means of data distribution storage and parallel computation capabilities based on a PC (Personal Computer) cluster, through the steps of dividing N*M grids, performing pyramid establishment task distribution and scheduling and pyramid establishment and correctly dividing grids and computing grid information, and by means of a communication transfer task between a control node and a computation node; and the method mainly aims to solve the related technical problem of how to divide the N*M grids, etc. The distributed algorithm for quickly establishing the massive remote sensing image pyramid has the following advantages that: based on the data distribution storage and parallel computation capabilities, the speed of generating the massive remote sensing image pyramid is increased; and the problem of black edges causedby image block documents crossing grids is solved; therefore, the purpose of increasing the pyramid establishing speed is achieved and the pyramid establishment accuracy is ensured.
Description
technical field [0001] The invention relates to the intersection field of geographic information and information technology, in particular to an algorithm for quickly creating pyramids based on distributed massive remote sensing images, which is applied in the construction of "national spatial data infrastructure". Background technique [0002] As an important basic data in the national spatial data framework, remote sensing images provide basic image information services for land planning, surveying and mapping remote sensing, military transportation, water conservancy and hydropower, agriculture, forestry and environmental protection, etc. Sex is also increasing. [0003] Among them, the Beidou satellite navigation and positioning system launched by my country in recent years can provide all-weather, 24-hour real-time positioning services. Its positioning accuracy can reach the synchronization accuracy of tens of nanoseconds. The 250-meter-resolution multi-channel true-c...
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IPC IPC(8): G06F17/30
Inventor 吕振华高峥胡俊赵慧吴健平黄飞鹏李波陈逸
Owner EAST CHINA NORMAL UNIV
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