I came across a file with a height field given in the following manner:

#declare Coul= pigment { color rgb <0.4,0.2,0>}

height_field {
    pattern 100,100 {
        hf_gray_16
        cylindrical color_map { [0 rgb 0] [1 rgb 1] }
        translate 1
        scale .3
    }
    //smooth
    pigment {Coul}
    clipped_by {plane {-y,-.05}}
    scale <5,2,5>
}

POV gives an error about "pattern":
Parse Error: Expected 'map file spec', pattern found instead
but I could not find the way to produce a height field without a GIF or PNG, or
a function. Is there a way to correct or convert the above lines?

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