測繪工程專業(yè)英語翻譯資料jsp(1)-預(yù)覽頁
【正文】 that the use of a plane surface as a reference datum for the elevations of points is totally unacceptable.（同樣可以明顯的【clearly】看到，用平面作點的高程的參考基準是完全【totally完全地】不可被接受的【不可以的】。）Due to the variable shape of the geoid, it is not possible to have a global ellipsoid of reference for use by all countries.（由于【due to】大地水準面的起伏不定的形狀，不可能有一個適用于所有國家的全球【global】參考橢球）The bestfitting global geocentric ellipsoid is the Geodetic Reference System 1980(GRS80), which has the following dimensions: semimajor axis is m and semiminor axis is m.（最適合的全球地心【geocentric地心的】橢球是1980大地坐標參考系統(tǒng)【80橢球，注意：我國使用的80坐標系使用的是75橢球】，尺寸【dimension尺寸、元】如下： m， m）The relationship of all three surfaces which are terrain, geoid and ellipsoid is illustrated in this Figure. （所有三個面：地表、大地水準面和橢球面的關(guān)系，由這個圖圖解說明【illustrate圖例說明】）We note that the orthometric height H is the height with reference to the MSL, whereas the geodetic height h is the height of anything above the reference ellipsoid.（我們注意到，正高H是參考MSL的高度，而【whereas】大地高h是參考橢球面的高度）The relation between the two kinds of heights is shown in the Figure, where the quantity N, the height of the geoid above the reference ellipsoid or the perpendicular distance between the geoid and the reference ellipsoid at a point, is usually called the geoidal height (geoid undulation).（這兩種高度之間的關(guān)系如圖所示，N這個量【quantity】，某個點上大地水準面高于參考橢球面或者說大地水準面和參考橢球面之間的垂直距離【perpendicular distance垂直距離】，通常被稱為大地水準面高【geoidal height】（大地水準面差距【geoid undulation；undulation波動】）Thus, the knowledge of the geoid is necessary for transforming the geodetic to orthometric heights and vice versa. （這樣，把大地高轉(zhuǎn)換為正高，大地水準面的知識就是必需的，反之亦然【vice versa反之亦然】）Once we determine the geoid, we can pute the difference between the two surfaces, the ellipsoid and the geoid anywhere in the country.（一旦我們確定了大地水準面，我們就可以計算這兩個面的差距——國家的無論何處的橢球面和大地水準面）The expression “ellipsoidal height” for (geodetic) height of anything above the reference ellipsoid is also used paring the acceptance of the standard geodetic term of “geoidal height”.（相對于標準的大地測量學(xué)術(shù)語“大地水準面高”的采用【acceptance接受、認同】，“橢球高”這個表示高于參考橢球面的高度（大地高）的表達【expression】也被采用。它可以是正也可
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