Pasikeitimų fiksavimas kartografuojant miestą stambiuoju masteliu skaitmeniniu principu

Abstract

Territorial planning, engineering tasks in cities require up- to-date, reliable and precise cartographic information. On the other hand, cities endure changes, expansion. Every city has an archive where information of map sheets at large scale is stored. An opportunity to computerise collection, updating of cartographic information became possible in the process of development of GIS technologies. It means to elaborate the process for digital cartography. With this intention many cities have started to make topographical-engineering digital maps in different ways. In most cases the main attention is paid to the establishment of digital maps and usage of their printed copies. At the same time digital maps become outdated, lose their importance. Separate attempts to supplement existing digital cartographic information without permanent, logical technology for digital updating do not provide desirable results. In the process of designing technology for updating cartographic data, it is necessary to investigate continual and cyclic updating alternatives. The main influence for choice to update a city digital cartographic information is exerted by the economical situation in the country as well as in the city. No doubt, exceptions are possible. In this case different cities in the same country will use some alternatives of updating. Another very important factor are laws on establishment of cartographic material and use of this material for designing. Cyclical updating of cartographic information in cities is usually chosen in countries, where job of surveyor is expensive and laws do not require too detailed maps. In archives of Lithuanian cities there are stored maps at large scale with a lot of details. They were and in some cities still are being updated in a continual way. Therefore, continual updating is more acceptable for Lithuanian cities. This article deals with establishment of technological line for continual updating which may be used in digital cartography in a city.