Admiralty Manual of Hydrographic Surveying
In mountainous country, however, contours at 50 m or 100 m intervals may be all that are necessary to show the shape of the ground. ... The normal way of obtaining contour lines for land topography in hydrographic surveys is to fit them between a series of spot heights ... fitted with a device called a Parallax Bar. This is the method now most commonly used in , u.z , 00.09E-$- .90.1 : .QJ.iSC .Bt.l : . SO.
| Title | : | Admiralty Manual of Hydrographic Surveying |
| Author | : | |
| Publisher | : | - 1970 |
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