Last Friday, Dr Maria Cobb of Computer Science Dept. of USM gave us a very nice seminar on the uncertainty models in geographic information systems and spatial databases.

At first, Dr Cobb presented the topic: introduction, GIS & spatial database, etc. and then introduced the importance of uncertainty for spatial database: early fuzzy database, university consortium for GIS (UCGIS), U.S. national imagery and mapping agency.

Then Dr Cobb presented the concept of GIS and then gave some examples: typical queries; typical application areas (urban planning, utility siting).

Then Dr Cobb introduced the design of GIS applications: feature attributes and values and spatial data entry problems: digitize -- convert spatial features on map into digital format; digitization steps -- digitizing table; procedures.

Then Dr Cobb presented the spatial database: spatial data, spatial data modeling, application; and the spatial queries: feature based, location based, necessitates attribute and spatial data access.

Then Dr Cobb introduced the error in spatial data, uncertainty in spatial data, and challenges in modeling spatial data: (1) representation, (2) relationships, (3) uncertainty in (1) & (2).

Then Dr presented the relationship based on topology and geometry, and uncertainty in spatial relationships, geometric representation (examples), specific problems, fuzzy databases.

At last Dr Cobb introduced the early fuzzy special database, example relationships, and map conflation.

Last Update: 4/24/98
Web Author: Zizhong Wang
The report is for Dr Paprzycki@ marcin.paprzycki@ibspan.waw.pl or@ Home Page