測(cè)繪工程專業(yè)英語(yǔ)翻譯資料jsp(1)-全文預(yù)覽
【正文】 的意思】）Such a surface is referred in surveying as a ‘reference ellipsoid’.（這樣一個(gè)表面在測(cè)量里被稱為【refer提到、涉及】“參考橢球”）The Geoid （大地水準(zhǔn)面）Since the physical surface of the Earth can’t be used as a putational surface, a mean sea level surface is instinctively taken into consideration.（由于【既然】地球的自然表面不能被當(dāng)作一個(gè)計(jì)算面來(lái)用，平均海平面自然的【instinctively本能地、自然地】被考慮【被考慮作計(jì)算面】）Mean sea level (MSL) is defined as the average level of the ocean surface for all stages of the tide after long periods of observations.（平均海平面被定義為在經(jīng)過(guò)長(zhǎng)時(shí)間的海潮的觀測(cè)后得到的整個(gè)時(shí)期【stage階段、時(shí)期】的海洋表面的平均水平面）We use MSL as a plane upon which we can reference or describe the heights of features on, above or below the ground.（我們用平均海平面當(dāng)作一個(gè)平面，在上面我們可以定位【reference原意為名詞，這里詞性改變——?jiǎng)釉~：定位、參考】或描述高于、低于或在地面上特征的高度）By extending the earth’s MSL through the land areas, an equipotential surface approximately at MSL would be formed.（將地球的平均海平面延伸穿過(guò)陸地，一個(gè)近似【approximately近似地】于平均海平面的等位面【equipotential surface等位面】形成了）Such a surface is called the ‘geoid’. Thus by definition, the geoid is an equipotential surface of the Earth gravity field that most closely approximates the mean sea surface.（這樣一個(gè)面被稱為“打的水準(zhǔn)面”。Unit 13 Geoid and Reference Ellipsoid（大地水準(zhǔn)面和參考橢球）The Earth’s physical surface is a reality upon which the surveying observations are made and points are located.（地球物理表面【或者說(shuō)，地球自然表面】是一個(gè)實(shí)體，測(cè)量工作【observation觀測(cè)】在其上進(jìn)行，點(diǎn)位在其上進(jìn)行定位。）If the area under consideration is of limited extent, orthogonal projection of this area onto a plane surface may result in negligible distortion.（如果在考慮中的【under consideration在考慮中的】區(qū)域是有限范圍的，該區(qū)域在一個(gè)平面【plane surface】上的正交投影【orthogonal projection】導(dǎo)致的【直譯為導(dǎo)致，可以意譯為：其結(jié)果】是可以忽略的【negligible可以忽略的】變形【distortion】）Plane surveying techniques could be used to capture field data and plane trigonometry used to pute position.（平面測(cè)量技術(shù)可以被用來(lái)獲取外業(yè)數(shù)據(jù)，平面三角學(xué)用來(lái)計(jì)算位置坐標(biāo)）However, if the area extended to a large area beyond limitation and treated as a flat surface the effect of the Earth’s curvature will produce unacceptable distortion.（然而，如果該區(qū)域延伸【extend】為一個(gè)大的區(qū)域超過(guò)了限度，把它當(dāng)成一個(gè)平面，地球的曲率影響【effect】將產(chǎn)生不可被接收的【unacceptable】變形）It can also be clearly seen
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