On-line Integration of Photogrammetric Systems and Spatial Databases for Producing Structured and Consistent Data for Gis

Photogrammetric systems are important sources for GIS databases. Currently, the trend towards the integration of photogrammetric systems and spatial databases is increased significantly. Integration of photogrammetric systems and spatial databases has great benefits in which some of them are mentioned here. This integration makes it possible to use information stored in spatial databases in the process of automatic or semi-automatic data acquisition and updating. It reduces time and costs of producing and maintaining high quality and up to date information in spatial databases. Also, if on-line data structuring and quality control tools are provided and applied in these systems, the quality of data will be increased significantly. Quality and consistency of data is very important due to the fact that it affects reliability of the results of GIS analysis. For avoiding occurrence of inconsistencies and errors and maintaining the quality of database, on-line data structuring and consistency control must be considered. In this research for achieving mentioned purposes, on-line integration of photogrammetric and spatial database management systems for producing fully structured and consistent data has been investigated. In this way, a rule-based integrated system was developed for on-line and automatic data structuring and applying consistency constraints using object oriented methodology. Results of practical test of this system have shown that the produced and saved data in spatial databases, by means of this system, is consistent and structured efficiently. It shows high flexibility in solving different problems. In addition, time and costs of producing spatially structured and consistent data for GIS applications is significantly reduced.