| Author | Trinidad, Gerardo Santos |
| Call Number | AIT Diss. no.CS-90-1 |
| Subject(s) | Geography--Data processing
|
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | This research represents an attempt to use a deductive database approach to GIS. A database model incorporating uncertainty and temporal aspect of geographic data was developed. In this model, a thematic map is represented as m(i,v) where v is a subset of the domain of attribute values associated with map m. The value v is interpreted as the set of all possible attribute values that can be associated with index i for map m. If v has only one element, then there is complete information available. Index i is a tuple where s is a spatial index and t is a temporal index. This research is also concerned with methods of maintaining consistency between different base and derived relations (i.e thematic maps) after each update transaction. This is especially important in updates on derived relations, where they must propagate to updates on base relations. Two types of updates were identified and corresponding algorithms were presented. These algorithms insure the primacy of new information while consistency and persistence of prior information are maintained. |
| Year | 1990 |
| Type | Dissertation |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Computer Science (CS) |
| Chairperson(s) | Huyn h Ngoc Phien;Kanchit Malaivongs |
| Examination Committee(s) | Vilas Wuwongse;Kaew Nualchawee;Robinson, Vincent B. |
| Scholarship Donor(s) | Japanese Government |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 1990 |