Main state topographic map: structure and principles of the creation a database

Summary Topographic databases and geoinformation web services for their use in spatial data infrastructure have become the predominant type of final products of national cartographic and cadastral agencies of developed countries. This paper presents the results of research work on the creation of a geographic information system of the topographic database “Main State Topographic Map”, the initial filling of which is carried out based on updated digital topographic maps of the scale 1:50 000. The proposed solutions comply with international standards in the field of geographic information, and their implementation provides a comprehensive application of the latest geoinformation technologies and geospatial databases to create a seamless topographic database for the entire territory of Ukraine with wide access to it by interested users on the system geoportal. The main features and innovations of the topographic database being created include: completeness of classes of topographic features and their attributes; an integrated system for identifying topographic features in a database, in which each topographic feature is assigned a unique topographic identifier, as well as a code according to the industry classifier; integrity of geometric models of topographic features, in which features are not fragmented by the boundaries of the sheets of topographic maps on which they are reflected; topological consistency of geometric models of topographic features at the level of planar graph topology for all adjacent and intersecting features; support for metadata both for classes of topographic features, and for their specific instances and their attributes; use of an object-relational database management system for the implementation of an integrated storage of all information resources of the system; harmonization of geospatial data and metadata models, data exchange formats, methods and procedures for assessing data quality with the requirements of the series of international standards of the ISO 19100; prompt updating of data in the system based on the results of continuous topographic monitoring of the area; providing wide and open access to topographic data through the system’s geoportal.