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I wish to create a single contour line of height 4.54 m from a DEM layer. Any idea how I may do this please?

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Just a couple of examples are:

  1. QGIS main menu Raster | Extraction | Contour
  2. Processing Toolobox SAGA | Vector <-> raster | Contour lines (or SAGA | Vector to raster | Contour lines)

(1) QGIS Contour

After setting your input file and output filename, turn the bottom window into "edit mode" by clicking on the pencil mark. Then add -fl 4.54 in the command line. Click on [OK] button to run.

(2) SAGA Contour lines

Just give your 4.54 (m) to both Minimum and Maximum Contour Value.

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