| 释义 |
photoconˈtrol
[f. photo- 1, 2 + control n.]
1. Control by light.
1954Bot. Gaz. CXV. 360 (heading) Oxygen consumption of lettuce seed in relation to photocontrol of germination. 1975Nature 10 Apr. 512/2 Many aspects of plant development are subject to photocontrol by way of the chromoprotein photoreceptor phytochrome.
2. Surveying. (Also as two words.) A control (i.e. a system of precisely surveyed points in terms of which subordinate local surveys are carried out) consisting of points that can be identified on aerial photographs.
1956Nature 3 Mar. 419/1 Good progress was made with geodetic surveys, and the triangulation and photocontrol work over twenty thousand square miles..was completed. 1967F. H. Moffitt Photogrammetry (ed. 2) v. 126 The rigid requirements for precision photo control for analytic control extension, for cadastral surveys, and for certain types of highway design mapping, make it necessary to pre-mark a great deal of the control points. 1974P. R. Wolf Elem. Photogrammetry xi. 223 According to this rule, a map being plotted with a contour interval of 10 feet requires vertical photo control accurate to within {pm} 2·0 feet. |