[GRASS-dev] [GRASS GIS] #912: r3.mapcalc depth() and z() function upside down

[GRASS GIS]

#912: r3.mapcalc depth() and z() function upside down
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 Reporter:  ayepri       |       Owner:  grass-dev at lists.osgeo.org
     Type:  defect       |      Status:  new                      
 Priority:  normal       |   Milestone:  6.4.0                    
Component:  default      |     Version:  unspecified              
 Keywords:               |    Platform:  MacOSX                   
      Cpu:  Unspecified  |  
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 # computation of a 3d raster with z values from the z() function
 r3.mapcalc Z='z()'
 # export to VTK format (see attached image grid_inversed_z.png)
 r3.out.vtk Z output=./Z_3dg.vtk

 In r3.mapcalc, z() function returns -z, and depth() function returns the
 elevation of the cell. On the grid_inversed_z.png (viewed in Paraview),
 one can note that higher Z values are at the bottom of the grid (mind the
 axis at the bottom left).
 mputed z() isosurfaces are not horizontal (see grid_inversed_deformed_z)

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Ticket URL: <http://trac.osgeo.org/grass/ticket/912>
GRASS GIS <http://grass.osgeo.org>