In the destination of construction geoinformatics systems meeting require-ments put before them is necessary elaboration detailed principles of the assessment methodology of spatial data quality. The spatial registration of utility infrastructure is one of basic databases of the local system. This study focuses proposial the description of the quality cadastre data in accordance with guidelines of the norm PN-EN-ISO 19113
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Computer databases that store information describing the space should be judged qualitatively. This requirement especially applies to the official geoinformation systems. The paper presents a proposal for an overall assessment of the quality of the information collected in the county's databases. It was analyzed six thematic groups: land and buildings cadastre, base numerical map, spatial registration of utility infrastructure and horizontal control class III. Experimental studies carried out in two counties located in the Malopolska province. Data quality assessment was based on four characteristics: accuracy, completeness, timeliness and consistency. Then calculated values of the two estimators of the overall assessment of geo-information databases: the average absolute value and coefficient of variation of averages. Overall assessment of quality geospatial data in the two counties is good. The process of improving the quality of informations presented comparing the results of current work to a study conducted in 2005. In this period fixed overall assessment of data quality in both counties by about 5 percentage points. Accuracy, timeliness and consistency of county data systems is good. While the completeness of the data still does not meet the required criteria. ...
In Poland national geoinformation system is built at the three levels: central, regional and local. The system levels differs in range of description and detail of data. The local (county) level spatial information system databases are the most detailed. The digital development and the current legislation (Law on spatial information infrastructure) make the expansion of official Internet site accessing various thematic maps. This paper presents proposals for an overall assessment of geoportals created at the local level (county). Methodology for assessing the overall based on three criteria: transparency, functionality and content available. Category transparency are attributes of evaluation defining the effort it takes an organization to share information through its Web site. The functional category defining attributes of assessing the ease with which users can obtain information on one page. Rating the content is quantitative verification of spatial data contained in the portal of the three thematic groups of the Act on infrastructure.The proposed method of assessing the valuation performed spatial data quality in 29 counties located throughout the country. As a result of research work, it was found that the overall assessment web geoportals is satisfactory. Each of the sites got more than half the maximum number of points. ...
The official databases that collect spatial data sets, should contain the sets of metadata used to describe them. The main element of the set of metadata are the features describing of the quality and validity of spatial data. The paper proposes a method for evaluating the quality of databases of spatial registration of utility infrastructure (GESUT) based on four criteria: positional accuracy, completeness, timeliness and logical consistency. The quality of property data of positional accuracy is calculated based on the attribute of source (specified for each type of test object of GESUT). Completeness of data was calculated on the basis of GESUT objects that exist on the digital basic map, and did not registered them in a GESUT. Timeliness of data was determined by analysis of time to waiting for the inserting to database geodetic measurements. Logical consistency was assessed by analyzing of level conflicting relationships in the data. The evaluation results for the various properties are described by the value of a point on a scale from 1 to 100. Overall evaluation of the quality of the data bases GESUT was performed by calculating the two estimators: the value of average absolute and factor of medium volatility. ...
Land and buildings registry, according to the current rules in Poland, acts as a real estate cadastre. As a public register, is subjected to the current and periodic modernization. The aim of the modernization is to improve the quality of the collected data. The most satisfactory results in the process of modernization are obtained on the basis of geodetic field measurements. Photogrammetric measurements are a more economical solution, but their use carries a risk of failure in meeting the criteria of accuracy positions of border points. This paper represents a case study on the effects of the process of modernization of the land and building registry for areas where the source material are registry maps in the scale of 1: 2000, created on the basis of photomaps, or cadastral maps in the scale of 1: 2880. The aim of the study is to assess and verify the suitability of these materials in the process of modernization. The study was conducted for 30 registration precincts, located in the Małopolskie Voivodship. For the analyzed objects the following information was collected: the total number of parcels within the precinct and the number of parcels that meet one of the five criteria of ...
Surveying field measurements performed during the development and updating of land registry were based directly on measuring networks. Accuracy parameters of these networks are lower in comparison with modern measurement networks. The main reasons for the lower accuracy relate mainly to the lower precision of measurements, two orders of network and approximate techniques for determining the coordinates of the points of these networks. Currently, archival materials of the State Geodetic and Cartographic Resource are used during surveying of real estate (division, separation, modernization of land registry). The paper presents the results of experimental evaluation of the accuracy parameters of former networks. The purpose of the performed evaluation to was to analyze the possibilities of use archival materials of the State Geodetic and Cartographic Resource during surveying works related to real estate. The study was carried out on the basis of three test objects located in the Małopolskie voivodship. Points of the analyzed networks found on the ground were measured (approx. 34% of all points), and then their coordinates were determined. The representative research sample was constituted by sets of deviations Z - the length of the displacement vector of the point in the research sample in relation to its position ...
