Online interactive visualization method for precision assurance of global geospatial data

A geospatial data, interactive technology, applied in the field of spatial data query based on vertex hierarchy and geospatial data simplification, which can solve the problems of complex data reading and writing query conditions, difficult spatial database processing, and uncontrolled data results.

Inactive Publication Date: 2019-01-22
CHINESE ACAD OF SURVEYING & MAPPING
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Problems solved by technology

[0003] The data reading and writing involved in the process of interactive spatial data visualization, exploratory data analysis, and online data editing in the Internet environment have the characterist

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  • Online interactive visualization method for precision assurance of global geospatial data
  • Online interactive visualization method for precision assurance of global geospatial data
  • Online interactive visualization method for precision assurance of global geospatial data

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Embodiment 1

[0122] The original data set used in the present invention comes from the full database export file of the official website of OpenStreetMap, namely Planet.osm, and the global coastline data is exported through the tool software OSMCoastline. The hierarchical structure construction and spatial index structure construction of the global coastline data are realized by using the multi-resolution hierarchical structure algorithm. Based on hierarchical structure and spatial index, set different error values ​​to realize interactive visualization of relational database.

[0123] See Figure 5 and Figure 6, Figure 5(a) is the result of a spatial approximation query with an error of 200 kilometers; Figure 5(b) is the result of a spatial approximation query with an error of 100 kilometers; Figure 6 is the visualization of a spatial approximation query for geographic elements Three-dimensional map.

[0124] By setting different error values, the number of vertices returned and the time ...

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Abstract

An online interactive visualization method for precision assurance of global geospatial data comprises the following steps: a multi-resolution hierarchical structure algorithm construction step of geographic elements, a vertex spatial index structure construction step, a spatial approximate query processing step based on a relational database and a query result visualization step. The invention provides an approximate calculation idea to solve the performance problem of geospatial big data processing, and on the basis of multi-resolution expression of geospatial elements and according to queryconditions, an approximate element capable of representing the original element with controllable error is generated. Geographical elements are expressed by spatial approximate query results, that is, elements are generated by vertex sampling in real time and approximate errors are reported to achieve flexible control of query precision and time.

Description

technical field [0001] The present invention relates to a spatial data interactive visualization method, in particular to a spatial data query method based on a vertex hierarchy, which can be used for geographic spatial data simplification and online interactive visual analysis of geographic spatial data. Background technique [0002] In recent years, the advancement of information technology continues to promote the rapid development of human society. The generation and accumulation of data has formed a huge and growing spatial data set. The rapid growth of the scale, complexity and application requirements of these spatial data has not only brought hope, but also posed challenges. With the continuous integration of global geographic data, the continuous improvement of data resolution, and the emergence of new technological applications, it has become possible to form an overall dataset of fine data of global geographic elements, and the OpenStreetMap dataset is a typical r...

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Application Information

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IPC IPC(8): G06F16/29
Inventor 仇阿根张福浩张志然钱新林何望君
Owner CHINESE ACAD OF SURVEYING & MAPPING
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