Abstract
Earth science research and applications usually use Distributed Geospatial Information Processing (DGIP) services and powerful computing capabilities to extract information and knowledge from large volumes of distributed geospatial data. Conceptually, such processing can be abstracted into a logical model that utilizes geospatial domain knowledge to produce new geospatial products. Using this idea, the geo-tree concept and the proposed geospatial Abstract Information Model (AIM) have been used to develop a Grid workflow engine complying with geospatial standards and the Business Process Execution Language. Upon a user's request, the engine generates virtual geospatial data/information/knowledge products from existing DGIP data and services. This article details how to (1) define and describe the AIM in XML format, (2) describe the process logically with an AIM, including the geospatial semantic logic, (3) conceptually describe the process of producing a particular geospatial product step by step from raw geospatial data, (4) instantiate AIM as a concrete Grid-service workflow by selecting the optimal service instances and data sets, and (5) design a Grid workflow engine to execute the concrete workflows to produce geospatial products. To verify the advantages and applicability of this Grid-enabled virtual geospatial product system, its performance is evaluated, and a sample application is provided.
| Original language | English |
|---|---|
| Pages (from-to) | 581-604 |
| Number of pages | 24 |
| Journal | International Journal of Geographical Information Science |
| Volume | 23 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2009 |
| Externally published | Yes |
Funding
This project was supported by grants from the NASA Earth Science Data and Information System Project (NCC5-645, PI: Dr. Liping Di), NASA Advanced Information System Technology program (NAG-13409, PI: Dr. Liping Di), NASA REASoN program (NNG04GE61A, PI: Dr. Liping Di), and US National Geospatial-Intelligence Agency NURI program (HM1582-04-1-2021, PI: Dr. Liping Di). Additional funding was supplied by OGC for developing the OGC Web Services: WCS, WMS, CS/W. Many thanks are given to our colleague, Dr. Barry Schlesinger, for his proofreading of the manuscript.
| Funders | Funder number |
|---|---|
| NASA Earth Science Data and Information System Project | NCC5-645 |
| National Aeronautics and Space Administration | NNG04GE61A, NAG-13409, HM1582-04-1-2021 |
Keywords
- Abstract modeling
- Grid computing
- Grid service chain
- Process workflow
- Virtual geospatial product