Maps and map-making; three lectures delivered under the auspices of the Royal geographical society (1910)
Reeves, Edward Ayearst, 1862-1945, Royal Geographical Society (Great Britain) · London, The Royal geographical society · leaf 145
Fig. 121.—Principle ofContouring. 124 MAPS AND MAP-MAKING Apart from their accuracy, contours, if sufficiently close, <nvea good general idea of the relief of a district, as may be seenby Fig. 123. In all exact large-scale surveys contour-linesare accurately drawn from careful levelling, but in… … Fig. 122.—Contoured Map of part of Snowdon District (from 1-inchOrdnance Survey). work, the lines are only approximate, and are really hori-zontal form lines. But whether they are proper contoursor only approximate, the intervals between them should bein accordance with some rule, which is now, for…
Cartography · Surveying
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