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Excerpt from Geographical and Geological Surveys, 1875
A good topographical map of any region, therefore, will have indicated upon it all natural objects, such as lakes, rivers, and smaller water-courses; artificial ones, namely, boundaries of fields, enclosures, roads, houses, etc.; and, besides these, it will exhibit to the eye and furnish for use the vertical eleva tion at all points above the level of the sea, this being usu ally chosen as the datum line from which the altitudes are reckoned. And by level of the sea is usually meant mean low tide, or else the mean between mean low and mean high tide.
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