Section 02 · 5 entries
Relief
Levelling, stereo compilation, and the choice of interval.
A forty-foot interval and a ten-foot interval over the same ground produce different landscapes on paper.
Photo: kdadan97 / PexelsEntries in Relief
Ref · subject · read- 006 The interval decides what counts as a hillA forty-foot interval and a ten-foot interval over the same ground produce different landscapes on paper. 3 min
- 007 LevellingHeight is carried across country one instrument setup at a time, and every setup adds a little error. 2 min
- 008 The datum a height is counted fromEvery elevation is relative to a surface somebody chose. Readjust the network and every number moves. 2 min
- 009 Stereo compilationTwo overlapping photographs and one operator's eye. How relief got drawn before laser. 3 min
- 010 Form linesContours drawn by judgement rather than measurement, and how to spot them. 2 min