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Abstract:
When using spatial data and information in decision making is a complex knowledge of the characteristics essential for evaluating the reliability and accuracy of decisions. Using the method of value analysis and mathematical modelling is possible to create a comprehensive system for evaluation of spatial data usability. Based on the input characteristics of the used spatial data and databases, quality characteristics and their changes can be calculated with the help of analytical methods. A comparison of the quality improvement or modification of databases is possible to optimize both the overall usability, and costs incurred on its security.
Keywords: Reliability. Decision making process. Mathematical modelling. Spatial data. GIS. Quality assessment. Utility value.
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1 INTRODUCTION
Rather extensive databases of area-localized data utilized in a number of fields are created in the Czech Republic. Data model geographic objects and phenomena of both natural and social character (water courses, settlement structure, atmospheric pressure, etc.). The created and utilized data always encompass a position element, which localizes objects and phenomena in a given reference coordinate system, and a thematic element, which describes qualities of the given objects and phenomena (e.g. the speed of a water course, number of inhabitants in a city). The actual data may then be of both geographic and non-geographic character. The following text therefore uses predominantly the general term "spatial data".
Basic localization database for command and control is created by the Geographic Service of the Army of the Czech Republic. Spatial data, provided by this database, are used not only for basic orientation in space but also as data for solving tasks connected with actual decisions, e.g. geographic impact on combat and non-combat army activities in given environments, in cases of military threats to the state, etc. In a number of tasks the source data are combined and based on mathematically or procedurally described processes, new data are created.
2 QUALITY AND RELIABILITY OF SPATIAL DATA CONCEPT
The produced data are intended for consumption, which means they are to be used in concrete spatial analyses, planning and management. From the user's perspective, systems for data evaluation are also highly important, particularly for their feature of utility value assessment [3]. Technical functionality can be assessed generally without knowing the...