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Geo-Spatial Database Management

The Geo-Spatial Database Management (GDM) group plays a crucial role in the Ganga River Basin Management project involving data storage, sharing, visualization, and knowledge extraction. Using open source software, the GDM functions include searching, querying, and accessing spatio-temporal data for various thematic groups. Security measures and access control protocols ensure the right data access to users and thematic group leaders. The web interface allows users to search for specific data, query spatio-temporal attributes, and visualize geographic information using maps and images. Stay updated with the project's progress on gangalaya.in and gangagyan.in websites.

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Geo-Spatial Database Management

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  1. Geo-Spatial Database Management Arnab Bhattacharya 5th November, 2011

  2. Ganga River Basin Management • Multiple themes • Necessary to have interaction among thematic groups • Certain types of knowledge possible only through interaction • Do number of dolphins decrease significantly when there are more tourists in a certain area? • Data sharing is the key • Knowledge extraction built on top • Thus, the geo-spatial database management (GDM) group

  3. Functions of GDM • Central to the entire project • Data storage • Data sharing • Interchange of data format • Searching • Querying • Visualization • Repeatability • Security • Access control • Knowledge extraction

  4. Data Storage • Database server • Upload/download facilities • Web frontend • www.gangalaya.in • www.gangagyan.in • Using open source software in Linux • ArcGISenabled

  5. Screenshot of Website

  6. Searching and Querying • Using metadata tags • Find population of Kolkata in 2011 • How much rainfall happened in Kanpur in June? • Can be more complicated • Find all cities in Uttar Pradesh and Bihar that were flooded within 7 days of each other • Can be visual as well • Select a region and a time-period • Show attributes in that spatio-temporal data • Unit of data is spatio-temporal • Other attributes are values

  7. Spatio-temporal Data • Spatial data • Point • Polygon/bounded space • Curve • Area/volume • Temporal data • Time point • Time interval • Spatio-temporal data • Any combination of spatial and temporal data

  8. Visualization • Data is essentially geographic (GIS) • Mostly in forms of maps • Raster images • Vector images • Ability to register maps • Using geographic coordinates • Should be able to download final maps as images • Maintained at http://www.gise.cse.iitb.ac.in/GangaGeoportal/html/grbmp_gise.html

  9. Snapshot

  10. Security and Access Control • Who should be able to access which data? • Three types of users • Common user • GRBMP members • GRBMP thematic group leaders • Three types of access • Existence • Viewing • Downloading • Higher access type implies lower types • Downloading enables viewing, etc.

  11. Access for Data • For each piece of data, there is essentially a vector of access control • Each element is for a particular user • Value determines the highest access • Whole access control is thus a matrix

  12. Users and Groups • Users can be grouped • Thematic groups specify one type of groups • A user can create her own group • Access control rights for a data can be defined for a group

  13. Status • Work in progress • Website is up • Basic upload/download facilities • Access control is being implemented • Visualization and querying facilities are provided Thank you!

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