Automation of update of digital national geo‐reference databases

Abstract

Unified geo‐reference data model is a very important part of national geographic information management. It has been developed within the project of Lithuanian geographic information infrastructure in 2006–2008. This model allows automated integration of large scale (mainly municipality) geo‐reference data into the unified national geo‐reference database. It is based on unique object identifiers across all geo‐reference databases and on standard update and harmonisation procedures. The common stages of harmonisation of geo‐reference databases at different scales include: implementation of a unique identifier of geographic objects across all databases concerned; definition of the life cycle of the objects; definition of cohesion boundary and of the harmonisation points along the boundary; maintenance of the local database and automatic update of the national database using special service. When implemented, such model will significantly facilitate maintenance of national geo‐reference database and in five years from full implementation will have a significant economic effect.

Santrauka

Lietuvoje atlikta savivaldybese kaupiamu erdviniu duomenu analize parode, kad tik didesniu miestu savivaldybes kaupia erdvinius duomenis, tačiau erdviniu duomenu sandaros skirtingos. Nacionaliniu lygmeniu kuriamos erdviniu duomenu bazes nesuderintos tarpusavyje, dubliuojamas erdviniu duomenu kaupimo procesas, orientuojantis i skirtingu masteliu žemelapiu gamyba. Bendras georeferenciniu duomenu modelis (VGDM) apima georeferenciniu duomenu konversija iš ivairiu masteliu oficialiu geografiniu duomenu rinkiniu, o ypač iš savivaldybiu georeferenciniu duomenu rinkiniu i bendra valstybes georeferenciniu duomenu baze (VGDB) ir nuolatines VGDB atnaujinimo procedūras. VGDB atnaujinimo technologijos pagrindas ‐ geoobjektu (vektoriniu geografiniu duomenu elementu) egzistavimo ciklas ir pokyčiu sekimas. Georeferenciniu duomenu modelis reiškia, kad yra numatytas kelias pasiekti efektyvia ivairiu masteliu oficialiu duomenu baziu saveika.

Keywords:

• geo‐reference base data
• feature
• geographic data model
• update service
• harmonisation
• efficiency

Reikšminiai žodžiai:

• kartografija
• GIS
• geografiniu duomenu modeliai
• georeferenciniai duomenys
• atnaujinimo servisas
• darninimas