hyp·​sog·​ra·​phy | \hipˈsägrəfē\
plural -es

Definition of hypsography 

1 : a branch of geography that deals with the measurement and mapping of the varying elevations of the earth's surface with reference to sea level

2 : topographic relief or the devices (as color shadings) by which it is indicated on maps

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History and Etymology for hypsography

International Scientific Vocabulary hyps- + -graphy

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something that serves to warn or remind

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