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Eng ID | Term | Definition |
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1361 | differential levelling | See LEVELLING. |
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1362 | differential mode | A method of accurate positioning; transmissions of an electromagnetic position fixing system are received at known positions ashore and the ... more |
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1363 | differential shrinkage | In mapping, the difference in unit contraction along the grain structure of the material as compared to the unit contraction across the grai... more |
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1364 | diffraction | The bending of the RAYS of RADIANT ENERGY around the edges of an obstacle, or when passing near the edges of an opening, or through a small ... more |
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1365 | digital | A method of representing information by combinations of discrete and discontinuous data. |
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1366 | digital chart | See ELECTRONIC CHART. |
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1367 | digital computer | See COMPUTER. |
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1368 | digital imagery processing system | A system which processes images which are stored in digital form. |
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1369 | digital terrain model (DTM) | A model representing the terrain surface by a collection of digital data, mainly coordinates in three dimensions, x, y, and z, and a digital... more |
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1370 | digitization (or digitisation) | The process of converting analog data to digital data. |
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1371 | digitizer | A computer aided device equipped with a digitizing table and a CURSOR for digitally capturing graphical data (pictures, charts), usually bas... more |
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1372 | dike (or dyke) | An artificial ditch to hold, or control the FLOW of water. An artificial EMBANKMENT to contain or hold back water. In GEOLOGY, a tabular b... more |
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1373 | dilution of precision (DOP) | A parameter relating the precision of the position (and/or an unknown auxiliary) provided by a positioning system to that of the "observed q... more |
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1374 | diopter | A unit of refractive power of an optical system in the SI system. |
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1375 | dioptric light | See LIGHT. |
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1376 | dip | The vertical angle, at the eye of an observer between the horizontal and the LINE OF SIGHT to the APPARENT HORIZON. Also called dip of the h... more |
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1377 | dip circle | An instrument for measuring MAGNETIC DIP. It consists essentially of a DIP NEEDLE or MAGNETIC NEEDLE, suspended in such manner as to be free... more |
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1378 | dip correction | That CORRECTION to SEXTANT ALTITUDE due to the DIP OF THE HORIZON. Also called height of eye correction. |
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1379 | dip (or dipping) needle | A MAGNETIC NEEDLE suspended in such a manner as to be free to rotate about a horizontal AXIS. See DIP CIRCLE. |
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1380 | dip of a sea horizon | The vertical angle, at the eye of an observer, between the horizontal and the line of sight to the sea horizon. |