Integrating Spatial Data Linkage and Analysis Services in a Geoportal for China Urban Research

Abstract

Many geoportals are now evolving into online analytical environments, where large amounts of data and various analysis methods are integrated. These spatiotemporal data are often distributed in different databases and exist in heterogeneous forms, even when they refer to the same geospatial entities. Besides, existing open standards lack sufficient expression of the attribute semantics. Client applications or other services thus have to deal with unrelated preprocessing tasks, such as data transformation and attribute annotation, leading to potential inconsistencies. Furthermore, to build informative interfaces that guide users to quickly understand the analysis methods, an analysis service needs to explicitly model the method parameters, which are often interrelated and have rich auxiliary information. This work presents the design of the spatial data linkage and analysis services in a geoportal for China urban research. The spatial data linkage service aggregates multisource heterogeneous data into linked layers with flexible attribute mapping, providing client applications and services with a unified access as if querying a big table. The spatial analysis service incorporates parameter hierarchy and grouping by extending the standard WPS service, and data-dependent validation in computation components. This platform can help researchers efficiently explore and analyze spatiotemporal data online.

Factors Influencing open unemployment rates: a spatial regression analysis

“…Spatial matrix linkages are a fundamental component of spatial analysis [32], often achieved through the creation of a spatial matrix referred to as "matrix W." Various techniques for weighting this matrix are available. Researchers have proposed three distinct approaches for defining matrix W, encompassing contiguity, distance, and generality [33].…”

Problems of Designing Geoportal Interfaces

“…This concept was implemented in OpenStreetMap in its pure form thanks to which their maps are very detailed, and any change in geographic features and infrastructure can be timely added to the cartographic database which provides unprecedented relevance of the data presented in the system. When creating geoportal systems, many problems are solved both from the field of software engineering and other applied disciplines: software complexes of this kind acquire maximum efficiency when solving the problem of obtaining and storing information and knowledge (Samakovlija & Bartoli, 2017), automated analysis of collected data (Yermolaev et al, 2018;Yamashkin, 2018a;Yamashkin, 2018b), visualization of results and achievement of the possibility of working with them on the basis of modern web technologies (Fiedukowicz et al, 2012;Mehdi et al, 2014;Zhu et al, 2015). A special case is the navigation within a user-oriented geoportal and the search for geoinformation in large data sets.…”