Temporal-based fast comparison method for gis data in svg format
A format and data technology, applied in the field of temporally-based SVG format GIS data rapid comparison, can solve problems such as affecting system performance, lack of compatibility, incompatibility with massive data management, etc., to reduce sorting time, improve efficiency, shorten The effect of the matching process
Inactive Publication Date: 2017-10-27
TONGJI UNIV
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Problems solved by technology
At present, the usual practice of temporal GIS data management is to expand the relational spatio-temporal database, take time as a general attribute, and organize the spatio-temporal database according to the time series, but there are bottlenecks and deficiencies, for example, it is not suitable for the management of massive data and requires engine support and affect system performance, etc.
The object-oriented data model solves some shortcomings of the temporal GIS data model to a certain extent, but OODB (object-oriented database) is still not widely accepted in the market and key application areas, because OODB as a DBMS (database management system) It is also immature, for example, it lacks a completely non-procedural query language, view, authorization, dynamic mode update and parameterized performance coordination, etc., and lacks due compatibility between OODB and RDB (relational database), which makes A large number of established RDB customers dare not easily choose OODB
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[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
[0030] This embodiment provides a temporal-based fast comparison method for GIS data in SVG format, because large-scale GIS data in SVG format with different timestamps is a complex nested structure, such as figure 1 As shown, and the representation of various geographic elements in SVG is complex and diverse, this method defines rules based on the GIS data in SVG format. This method is named after I-DiffS and includes the following steps:
[0031] 1) The element nodes, attribute nodes and text nodes in a certain branch starting from the root node are regarded as a whole, defined as ...
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Currently, temporal GIS data access mainly adopts a relational database, achieves the purpose of temporal management by adding time characteristics into the database, and realizes and applies an interface through a database engine, and the traditional temporal GIS data access mode is low in efficiency. Researching large-scale temporal GIS data increment access through a SVG format belongs to a new approach, breaks through the traditional database access management method, and one of difficulties is to solve the problem of quick compare of large-scale SVG format GIS data at different timestamps. The technology, under the support of national natural science funds, realizes the quick compare of large-scale SVG format GIS data with data size in different levels and at different timestamps through years of research and improvement by a research group, a difference script of compare results only comprises two types of difference functions, and experiments prove that the technology has good application value and prospect.
Description
technical field [0001] The present invention is the intersection of computer technology field and geographic information technology field, especially relates to a kind of time-based SVG format GIS data quick comparison method, solves the large-scale (more than 5M) of different time stamps through computer and its algorithm technology research ) Rapid comparison of temporal GIS data in SVG format. Background technique [0002] The GIS composed of spatial data and attribute data is called static GIS (Static GIS), which is a "snapshot" of the real world, and the research on the changing process and laws of the real world requires GIS to have time characteristics, such as environmental monitoring, The research on GIS that changes with time in the fields of weather forecast, traffic management, surveying and mapping, land survey, etc. is called temporal GIS (temporal GIS). Temporal GIS not only has time characteristics, but also has the characteristics of large amount of data, na...
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Login to View More IPC IPC(8): G06F17/30
CPCG06F16/284G06F16/29
Inventor 杜庆峰赵亚男许家伟
Owner TONGJI UNIV