Although the advancement in sensor technology made inch-by-inch monitoring of agricultural field achievable but precision farming requires monitoring of several context attributes with context modeling to cope up with several distinct problems. Ontology is considered as most promising technique for context modeling. Despite several efforts towards developing agricultural domain ontology, lack of scalable ontology is still a concern. This paper describes scalable service oriented agriculture ontology (ONTAgri) that comprises over several small groups of concepts. The two major groups are system and agriculture. Agriculture group is further divided into core and services (like irrigation, fertilization) concepts. The notation of service oriented ontology made scalability and distribution possible which is the basic need of agriculture domain modeling. Index Terms – Ontology, Context modeling, Precision farming, Sensor, Agriculture.
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