• Altitude
  • A measure of height, especially of great height, as a mountain top or aircraft flight level. In meteorology, altitude is used almost exclusively with respect to the height of an airborne object above the earth's surface, above a constant pressure surface, or above mean sea level.  
Abstract from DBPedia
    Altitude or height (sometimes known as 'depth') is defined based on the context in which it is used (aviation, geometry, geographical survey, sport, atmospheric pressure, and many more). As a general definition, altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The reference datum also often varies according to the context. Although the term altitude is commonly used to mean the height above sea level of a location, in geography the term elevation is often preferred for this usage. Vertical distance measurements in the "down" direction are commonly referred to as depth.

    高度(altitudeまたはheight)は、航空、地理学、スポーツなどで、「高さ」をいうときに用いられる用語である。高度は測地系で採用する高さゼロの面又は点から、鉛直線上で「上」への距離(長さ)を表すが、通常は、その地点の海面からの高さ、すなわち「海抜」を意味する。海面からの鉛直線上での「下」への距離(長さ)を「水深」、「深度」又は「深さ」(depth) という。 「高度」よりも広い概念の「高さ」も参照のこと。


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