104 search results - page 13 / 21 » Querying Mediated Geographic Data Sources |
CIDR
2007
13 years 9 months ago
2007
We present a “black-box” approach to estimating query cardinality that has no knowledge of query execution plans and data distribution, yet provides accurate estimates. It doe...
ENGL
2007
13 years 7 months ago
2007
—This paper describes a methodology based on Answer Set Programming (ASP) to work with incomplete geographic data. Source geographic data which describes a risk zone is translate...
AAAI
2000
13 years 9 months ago
2000
Although much has been written about various information integration technologies, little has been said regarding how to combine these technologies together to build an entire &qu...
ICDE
2004
IEEE
14 years 9 months ago
2004
IEEE
Query optimization in data integration requires source coverage and overlap statistics. Gathering and storing the required statistics presents many challenges, not the least of wh...
GIS
2007
ACM
14 years 8 months ago
2007
ACM
Accurate and efficient integration of geospatial data is an important problem with applications in areas such as emergency response and urban planning. Some of the key challenges ...