This paper utilizes ontology to define and organize the information objects, data elements and their relations in the
domain of earth observation task of satellite. In this paper, we proposes a new method for building domain ontology of
earth observation task, it includes five steps: task definition, task disassembly, relation analysis, describing ontology and
ontology instantiation. The ontology-based method is effective and reliable for standardization and semantization of
earth observation task.
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