| 释义 |
ground truth, n.
Brit. |ˈgraʊnd ˌtruːθ|, U.S. |ˈgraʊn(d) ˌtruθ|
[‹ ground n. + truth n., in sense 1 probably after German Grundwahrheit (early 16th cent. in Luther).]
1. A fundamental truth. Also: the real or underlying facts; information that has been checked or facts that have been collected at source.
In later use perh. influenced also by sense 2.
1839H. Ellison Madmoments II. 362 As the Groundtruth of her own Existence it must be regarded, thro' Him in its highest, purest Aspect shown! 1868H. Bushnell Vicarious Sacrifice iv. i. 464 Of course they are religious beings, guilty beings, but these deep ground-truths of their nature work out in them, from a point back of their distinct consciousness. 1945Philos. Rev. 54 600 You can not escape this metaphysical ground-truth by taking refuge behind phenomena. 1988National Rev. (Nexis) 18 Mar. 44 The conventional wisdom holds that senators will fold before the Reagan Administration's take-it-or-leave-it stance... But that ground truth has changed in recent weeks. 1994H. Rheingold Virtual Community 263 Some volunteers are in cities where national governments can be lobbied; many are in remote locations where they can verify ‘ground truth’ about logging, mining, fishing operations, and toxic waste disposal.
2.
a. In remote sensing: information obtained by direct measurement at ground level, rather than by interpretation of remotely obtained data (as aerial or satellite images, etc.), esp. as used to verify or calibrate remotely obtained data. Also: the actual characteristics of a terrain being surveyed.
1965R. H. Alexander in Proc. Third Symp. on Remote Sensing of Environment 1964 (Univ. Michigan) 455 Talking as space scientists we can say that it will be essential to get some direct observations at the planetary surface in order to establish ‘ground truth’ and calibration of the data obtained by the remote sensors. 1976Science 17 Dec. 1346/3 Direct measurement of the vertical temperature profile during lander entry..resulted in the classic combination of remote global sensing and ‘ground truth’. 1991I. Masser & M. Blakemore Handling Geogr. Information (BNC) 80 It must be recognized that no map, however detailed or carefully compiled, can perfectly represent the ‘ground truth’. 2001World & I (Nexis) 1 Nov. 138 Researchers at this site are tracing the movement of soil water and chemicals below cornfields, under a nearby swamp, and into a creek. NASA uses the site as one of its ‘ground-truth’ stations to verify the accuracy of data from satellite microwave dishes.
b. Information obtained by direct observation of a real system, as opposed to a model or simulation; a set of data that is considered to be accurate and reliable, and is used to calibrate a model, algorithm, procedure, etc. Also: (spec. in image recognition technologies) information obtained by direct visual examination, esp. as used to check or calibrate an automated recognition system.
1977Proc. Soc. Photo-optical Instrumentation Engineers 119107 By comparison with the original image (ground truth), we can determine the degradation resulting from data or bandwidth reduction by quantization. 1995Proc. SPIE (Internat. Soc. Optical Engin.) 259299 Speed ground truth data, obtained by driving probe vehicles through the field of view of the detectors and noting the vehicle speed as measured by the vehicle instrumentation, were compared with the speed measurement from the detectors. 1998Adv. Imaging (Nexis) May 41 Each of these image sets and environment changes affecting the image quality are documented and the correct result is available in multiple ground-truth files. |