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Geospatial databases are irreplaceable national treasure of immense importance. Their up-to-dateness referring to its consistencywith respect to the real world plays a critical role in its value and applications. The continuous updating of map databases at1:50,000 scales is a massive and difficult task for larger countries of the size of more than several million's kilometer squares. Thispaper presents the research and technological development to support the national map updating at 1:50,000 scales in China,including the development of updating models and methods, production tools and systems for large-scale and rapid updating, as wellas the design and implementation of the continuous updating workflow.  The use of many data sources and the integration of these data to form a high accuracy, quality checked product were required. It hadin turn required up to date techniques of image matching, semantic integration, generalization, data base management and conflictresolution. Design and develop specific software tools and packages to support the large-scale updating production with highresolution imagery and large-scale data generalization, such as map generalization, GIS-supported change interpretation fromimagery, DEM interpolation, image matching-based orthophoto generation, data control at different levels.  A national 1:50,000 databases updating strategy and its production workflow were designed, including a full coverage updatingpattern characterized by all element topographic data modeling, change detection in all related areas, and whole process data qualitycontrolling, a series of technical production specifications, and a network of updating production units in different geographic placesin the country

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

Fast Updating National Geo-Spatial Databases with High Resolution Imagery: China's Methodology and Experience