ok - not that hard.
// start DEMPOV bigbend.dem bigbend.tga 0 0 15.000000 -442.000000 0.000000
or if you dont know bias, it's auto set, just leave it out
// start DEMPOV bigbend.dem bigbend.tga 0 0 15 0

and now writes this file:

// POV Height_field Example v. 1.0
height_field {
  // spatialResolution 30.000000 30.000000 1.000000
  // verticalScale 15.000000
  // width height 468 356
  tga "bigbend.tga"
  smooth
  translate <-0.5,-0.5,-0.5>
  scale <468,468,468>
}
  // start DEMPOV bigbend.dem bigbend.tga 0 0 15.000000 -442.000000 0.000000

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