| 释义 |
orthometric, a. Cryst.|ɔːθəʊˈmɛtrɪk|
[mod. f. ortho- + Gr. µέτρον measure: cf. isometric.]
1. Belonging to those systems of crystallization (the isometric, tetragonal, and orthorhombic) in which the axes are mutually at right angles.
1854J. D. Dana Syst. Min. (ed. 4) I. 23 In Crystallography there are three axes employed,..and these axes are either at right angles with one another, producing orthometric forms, or oblique, producing clinometric forms. 1864Webster cites Dana. 1883Encycl. Brit. XVI. 349/2 All crystals may be divided into ‘orthometric’ or erect forms and ‘clinometric’ or inclined forms.
2. Surveying. Of, pertaining to, or being a height measured from the geoid.
1919G. L. Hosmer Geodesy x. 254 The United States Coast Survey has adopted the method of applying to ordinary elevations the correction for convergence, called Orthometric Correction. 1923D. Clark Plane & Geodetic Surveying II. v. 205 A line of constant orthometric elevation is parallel to the mean sea level surface. 1967Heiskanen & Moritz Physical Geodesy iv. 172 Orthometric heights are the natural ‘heights above sea level’, that is, heights above the geoid. 1974Encycl. Brit. Macropædia XVII. 832/2 To correct these distortions, orthometric corrections..must be applied to long lines of levels at high altitudes that have a north–south trend.
Hence orthoˈmetrically adv.
1952G. Bomford Geodesy iv. 155 If no error of observation is made, Bb and aA will be measured orthometrically. |