1. Arnab Bhattacharya 5 th November, 2011

2.  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.  Central to the entire project  Data storage  Data sharing  Interchange of data format  Searching  Querying  Visualization  Repeatability  Security  Access control  Knowledge extraction

4.  Database server  Upload/download facilities  Web frontend  www.gangalaya.in www.gangalaya.in  www.gangagyan.in www.gangagyan.in  Using open source software in Linux  ArcGIS enabled

6.  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.  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.  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/GangaGeopor tal/html/grbmp_gise.html http://www.gise.cse.iitb.ac.in/GangaGeopor tal/html/grbmp_gise.html

10.  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.  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 User 1…User n Data 1V-E …DDD Data mVVV

12.  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.  Work in progress  Website is up  Basic upload/download facilities  Access control is being implemented  Visualization and querying facilities are provided