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Abstract
Propagation of Updates Through Different Scales Cartographic Databases
Lft. Khalifa Alnaqbi
Military Survey Department
Abu Dhabi, UAE
Eng. Abderrahmane Mellouk
Military Survey Department
Abu Dhabi, UAE
The lack of a fully automatic spatial generalization up till today has forced National mapping organizations to adopt different strategies to cope with the creation of the required cartographic products in different scales. Military Survey Department whose mandate is to ensure the provision of topographic coverage for the United Arab Emirates has opted for a cartographic production system (CPS) where a master National Topographic Databases (NTDB) is created for the country with a base scale of 1:25000. From this NTDB all the cartographic databases (CDB) necessary for the provision of the required products are created and coexist with the NTDB. Then the main challenge that MSD had to overcome
is the synchronization of these independent databases with the NTDB in terms of currency. For this the CPS was devised around the idea of collecting the updates once at the level of NTDB and propagating them through the different CDB in an almost automatic way leaving only few operations of data integration to be carried out manually. The process is also supported by a firm Quality monitoring of the update propagation. Key issues that helped achieving the target are mainly the design of easy matching spatial data models for the NTDB and PDB, the adoption of clear and concise data semantics, the adoption of time stamp for updates and their automatic retrieval and propagation, an automatic updates integration within the CDB and last but not least a centralized Quality monitoring and follow-up system in a versioned environment. This paper goes over the several aspects of the CPS and its implementation.
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