Selectivity Estimation is the base of spatial database query optimizer. 選擇性估計是設計空間資料庫查詢優化器的基礎。
Several examples are demonstrated to discuss the representing and querying ability of the new model and its database extension. 實例研究表明該模型及其資料庫擴展很好表達時空現象並支持場數據的空間資料庫管理和時空查詢。