John F. Carlson developed this concept and you can find a more elaborate explanation in Chapter 3 of his book Carlson's Guide to Landscape Painting.
From lightest to darkest, the four value planes in a landscape are:
Value numbers* used in this drawing:
*Reference back to our value scale lesson in "Getting Started" to understand value scale numbers.
With the value markers, make a 4 value landscape chart for use as reference in your drawing journal.
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