期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2008
卷号：XXXVII Part B4
页码：667-674
出版社：Copernicus Publications
摘要：The National Natural Resources Management System (NNRMS) supports the national requirements of natural resources management and developmental needs by generating a proper and systematic inventory of natural resources. In doing so, NNRMS adopts various advanced technologies of satellite and aerial remote sensing; Geographical Information Systems (GIS); precise Positioning Systems; database and networking infrastructure and advanced ground-based survey techniques. NNRMS standards have been adopted to enable technologies – imaging, GIS, GPS and applications – thematic mapping, services and outputs etc. to work together. Standards are important not only to facilitate data sharing and increase interoperability, as is understood from many international efforts, but also to bring a systematization and "automation" into the total NNRMS process of mapping and GIS itself. Towards this the project has defined standards for all geo-spatial data called NNRMS standards. Under the NNRMS program a large volume of spatial and non-spatial data has been generated. Most of the spatial data is in vector data format. An attempt has been made to organize the entire spatial and non-spatial data as a central repository at SAC as a Natural Resources Data Base (NRDB). The entire spatial data is organized into standard data format as per NRDB data organisation schema and managed in RDBMS environment using Oracle 10g database management system and ARCSDE. The thematic information considered is at the scale of 1:25000 and 1:50000. NRDB is a system of distributed databases where the spatial and non-spatial database resides at various locations well distributed within the country. However, the metadata is accessible and sharable from a single portal viz. the NNRMS portal. The portal provides a sharable framework with metadata as per NNRMS standards, quality evaluation procedures and their standardization. The Metadata Explorer utility is accessible only after a successful login. The login is a process of self-registration to identify one self on the portal. Details related to layer description, layer citation, layer spread, procedures adopted for achieving positional and thematic accuracy survey year, mapping year, year of digitization, collaborating agency, focal person for the data and his contact details are received from the data generating centers in XML format. A software package to simplify the task of ingesting project level information and finally generating the metadata in XML structure is developed. Tools have been developed using ArcObjects and Visual Basic to automatically generate and store in Oracle RDBMS, the thumbnails, legend and spatial information related to each layer at various administrative boundary levels such as district, state, country, map sheet covering quarter million scale as well as half million scale. A software package with a common interface is developed to routinely handle the task of generating the metadata from the contents of the project level XML files as well as the spatial layers stored in the geo-database. The metadata can be searched using the geo browser mode. An advanced search option is provided to search by category, layer, class, place name, or any combination of the same. The results are displayed as a map in jpeg format along with a legend. The metadata is displayed through hyperlinks for spatial information and description. This paper describes the technical details related to the generation of metadata and disseminating the same on Internet through the NNRMS portal
