local datum 中文意思是什麼
local datum
解釋
當地零點-
It can realize the automatic measurement rainfall and sequence record history datum on time with the rtc ; the system can be taken notes history datum more than 1 month at least ; communication interface supported by the serial communication interface can link with the pc ' s rs232, telephone network and mobile telephone network ; it can persist in working with backup power more than 1 day when the local junction circuit stops providing electricity
它可以實現自動測量降雨量；具備實時時鐘，按時間順序記錄歷史資料，系統至少能夠記錄1月以上的歷史資料；具備串列通訊介面，通訊介面應支持如下功能：與pc計算機的rs232介面、與電話網連接、與移動通訊網連接；具有后備電源，在市電斷電時能堅持工作1天以上。 -
Due to the development of gps, which is representative of spatial geodetic measure technology, and the satellite altimeter technology, it is possible to unify the local height datums in different countries ( or regions ) to the world height datum ( whd ). and the unification of height datums has been made in some countries
隨著以gps為代表的空間大地測量技術以及衛星測高技術的飛速發展，使得將各個國家或地區的局部高程基準統一為全球高程基準成為可能，並且在部分國家已經實現，因此將我國高程系統納入全球高程系統不僅具有理論意義，而且具有重要的現實意義。 -
The assimilation experimentation results indicate that after assimilating radar wind field of small spatial scale, mesoscale and small - scale precipitation prediction can be improved and mesoscale and small - scale information which ca n ' t appear by tradition datum can be gained, which is valuable to analyze the mesoscale and small - scale system structure ; the effect assimilating radar humidity field is n ' t obvious, which is perhaps correlation with precipitation types and assimilating time. the results also show that adding radar humidity field to initial condition at initial time can supply the gap of the regular data in reflecting the mesoscale and small - scale systems, strengthen the humidity in the initial field, and eventually help to improve precipitation. the experiment of assimilating radar wind field and radar humility field at the same time shows that vapor transportation and local vapor divergence play more significant role in causing excessively heavy rain than only high wet center
同化試驗結果表明：同化空間解析度很高的雷達風場后，能改善中小尺度降水的預報效果，並且能夠得到常規觀測資料所不能得到的中小尺度信息，對分析中小尺度系統結構具有重要意義；同化雷達濕度場效果不明顯，可能與降水類型和同化時刻有關；而直接在初始時刻加入雷達濕度場，補充了常規資料在反映中小尺度系統方面的不足，增強了初始場中的水汽，有利於降水量的增加；同時同化雷達風場和雷達濕度場的試驗表明，水汽的輸送和局地的水汽輻合對于產生特大暴雨的貢獻遠大於僅有高濕中心的貢獻。
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