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Three-dimensional dynamic loading method and device for raster data

A raster data, three-dimensional dynamic technology, applied in the field of natural resource information statistics, can solve problems such as not satisfying large-scale slope calculation and analysis, unable to calculate different elevation zones, slope zone distribution, and not supporting raster data calculation and analysis

Pending Publication Date: 2021-06-11
NAT GEOMATICS CENT OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of static raster tile service, because the raster data is pre-symbolized and then sliced ​​into static tile images, the image visualization of raster data on the user terminal does not support raster data calculation and analysis, etc. For example, the distribution of different elevation zones and slope zones cannot be calculated, so it does not meet the practical application requirements such as large-scale slope calculation and analysis

Method used

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  • Three-dimensional dynamic loading method and device for raster data
  • Three-dimensional dynamic loading method and device for raster data
  • Three-dimensional dynamic loading method and device for raster data

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Experimental program
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Embodiment 1

[0055] figure 1 This is a flow chart of the method for 3D dynamic loading of grid data provided in Embodiment 1 of the present invention.

[0056] refer to figure 1 , the execution body is the server, and the method includes the following steps:

[0057]Step S101, obtaining grid data, and establishing a Geohash-T spatiotemporal grid index and a symbol mapping table according to the grid data;

[0058] Step S102, receiving request information sent by the user terminal, where the request information includes the set geographic scope and the current window display level;

[0059] Here, the user terminal refers to the 3D map engine at the front end of the computer or mobile phone. The Geohash-T spatiotemporal grid index is used to organize the raster data in an orderly manner, and a timestamp is used to identify the time information of the raster data.

[0060] The Geohash-T encoding rule is: Geohash encoding + 8-bit time encoding, for example, 1110011101001000111120160103, wh...

Embodiment 2

[0094] Figure 4 It is a schematic diagram of a three-dimensional dynamic loading device for grid data provided by the second embodiment of the present invention.

[0095] refer to Figure 4 , applied to the server, including:

[0096] Establishing unit 1, for obtaining grid data, and establishing Geohash-T spatiotemporal grid index and symbol mapping table according to the grid data;

[0097] a receiving unit 2, configured to receive request information sent by the user terminal, where the request information includes a set geographic scope and a current window display level;

[0098] The pixel range set acquisition unit 3 is used to obtain the raster file name and the pixel range set according to the set geographic range and the current window display level;

[0099] Traversing unit 4, used to traverse the grid file name and pixel range set to obtain multiple target grid blocks;

[0100] The symbolizing unit 5 is used to symbolize a plurality of target grid blocks throug...

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Abstract

The invention provides a three-dimensional dynamic loading method and device for raster data, and the method comprises the steps: obtaining the raster data, and building a Geohash-T space-time grid index and a symbol mapping table according to the raster data; receiving a set geographical range and a current window display level sent by the user terminal; obtaining a grid file name and a pixel range set according to a set geographical range and a current window display hierarchy; traversing the grid file name and the pixel range set to obtain a plurality of target grid blocks; symbolizing the plurality of target raster blocks through a symbol mapping table to obtain a plurality of symbolized raster data; and sending the plurality of symbolized raster data to a user terminal, so that the user terminal displays the symbolized raster data on a three-dimensional terrain in an overlapping manner, dynamically displays the raster data through a symbol mapping table, supports operations such as calculation and analysis on the raster data, and supports change comparison and spatial analysis of time sequence raster data, and the practical application requirements of various scenes are met.

Description

technical field [0001] The invention relates to the field of natural resource information statistics, in particular to a three-dimensional dynamic loading method and device for grid data. Background technique [0002] In a 3D geographic information system, raster data such as elevation, slope and aspect are important basic information sources, which play an important supporting role in quickly grasping the natural geographic pattern of 3D geographic space and the spatial distribution of land. [0003] The traditional 3D geographic information system adopts the static raster data service method, that is, the raster data is sliced ​​and published as a static WMTS geographic information service, and then superimposed in the 3D geographic information system to form a pre-symbolized raster static data. However, for this type of static raster tile service, since the raster data is pre-symbolized and then sliced ​​into static tile images, the image visualization of raster data is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/05G06F16/51
CPCG06T17/05G06F16/51
Inventor 刘建军高崟张元杰刘剑炜赵文豪张晓倩车健翟召坤赵变利
Owner NAT GEOMATICS CENT OF CHINA