Method for extracting dynamic inundated area of large numbers of block topographic data, device and system thereof

Abstract

The invention discloses a method for extracting a dynamic inundated area of large numbers of block topographic data, a device and a system thereof. The method is used for a data-processing device, comprising the following steps of: scanning a block topographic dataset, and building a corresponding geographic space gridding indexed table for the block topographic dataset; setting the size of a movable window for analyzing the block topographic dataset according to a memory resource of the data-processing device; traversing the indexed table by the movable window, extracting a date of the blocktopographic dataset, the space range of which is overlapped with the space range covered by the movable window, by the indexed table, and computing the date of the inundated area according to a height variation value of the sea level inputted by users; and extracting a vector type inundated area boundary from the inundated area data. The method extracts the inundated area according to the height change of the sea level. The method is applicable to the different memory resources, supports the topographic data for block memorizing and managing large data quantity, and forms a geographical polygon which represents the inundated area.

Description

technical field [0001] The invention relates to the field of earth science computing, in particular to a method, a device and a system for extracting a dynamic submerged area of ​​block topographic data with a large amount of data. Background technique [0002] Digital elevation model (Digital elevation model, DEM) is an important surface parameter data, but due to the continuous and complex changes of the surface, the amount of DEM data is large, and it will increase geometrically with the increase of the area and the fine resolution. For example, the data volume of a global 1km DEM is 1.7G (GeoTiff file format), while the data volume of a 90m DEM is about 400G. There are difficulties in storage, processing and analysis of large data volume DEM, and storing DEM in blocks according to geographical range is an effective method to solve large data volume DEM storage, not only avoiding the capacity limit of a single raster data file (such as GeoTIFF 4G limitation), and provide...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a dynamic submerged area extraction method, device and system for a large number of segmented topographic data, which is used to solve the problem of adapting to different memory resource conditions, reducing the number of disk IOs, and aiming at large data volumes and The problem of extracting submerged areas from terrain data stored and managed in the form of data blocks

[0008] The present invention further solves the problem of analyzing terrain data sets stored in different block forms

[0009] The present invention further solves the problem of forming a geographic polygon in optimized vector form representing the submerged area for display

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