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   Creates a display file from an existing grid3 file according to
   specified threshold levels. The display file is a display list of
   polygons that represent isosurfaces of the data volume. If specific
   levels are given, additional optional parameters are ignored. Min or
   max may be used alone or together to specify a sub-range of the data.
   The step parameter is given precedence over tnum.

  Flags:

   -q
          Suppress progress report & min/max information

   -f
          Use flat shading rather than gradient

  Parameters:

   grid3
          Name of an existing 3d raster map

   dspf
          Name of output display file

   levels
          List of thresholds for isosurfaces

   min
          Minimum isosurface level

   max
          Maximum isosurface level

   step
          Positive increment between isosurface levels

   tnum
          Number of isosurface threshold levels
          Default: 7

Example:

   With grid3 data (phdata) in the range 3-7, we only want to see
   isosurface values for the range 4-6. Any of these commands will produce
   the same results:
r3.mkdspf phdata dspf=iso min=4.0 max=6.0 tnum=5
r3.mkdspf phdata dspf=iso levels=4.0,4.5,5.0,5.5,6.0
r3.mkdspf phdata dspf=iso min=4.0 max=6.0 step=0.5

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   Currently the grid3 file must be in the user's mapset since the display
   files being created are specific to particular grid3 files and are
   contained in directories under them. We should create a mechanism where
   users may make display files from others' grid3 files without having to
   copy them to their mapset.

ÐÐТÐÐ

   Bill Brown, [1]bbrown@gis.uiuc.edu

   Last changed: $Date: 2006-12-21 08:27:27 -0600 (ЧÑ, 21 дек 2006) $

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References

   1. mailto:brown@gis.uiuc.edu