"标高测量" can be translated into English as "elevation surveying" or "leveling survey".
"Elevation surveying" emphasizes the measurement of heights or elevations above a reference level.
"Leveling survey" is a more specific term in surveying, referring to the process of determining the relative heights of points on the Earth's surface.
Both expressions are commonly used in the field of surveying and engineering to describe the activity of measuring elevations.