[GRASS-dev] [GRASS GIS] #3210: r.texture: bug when non continuous series of values

[GRASS GIS]

#3210: r.texture: bug when non continuous series of values
--------------------------+-------------------------
  Reporter:  mlennert     |      Owner:  grass-dev@…
      Type:  defect       |     Status:  reopened
  Priority:  normal       |  Milestone:  7.2.0
 Component:  Raster       |    Version:  svn-trunk
Resolution:               |   Keywords:  r.texture
       CPU:  Unspecified  |   Platform:  Unspecified
--------------------------+-------------------------

Comment (by mlennert):

 There also seems to be something wrong with the Difference Variance
 calculation in the new version.


 {{{
 r.texture lsat7_2002_80 out=lsat8_text method=dv
 r.info lsat8_text_DV -r
 min=-inf
 max=0.1154514
 }}}

 By checking whether tmp is 0 in the function, I get an output that again
 looks much more interesting than the <= g7.0.5 output, but not sure this
 is right way to approach this:


 {{{
 -    var = ((tmp * sum_sqr) - (sum * sum)) / (tmp * tmp);
 +    if (tmp > 0) {
 +       var = ((tmp * sum_sqr) - (sum * sum)) / (tmp * tmp);
 +    } else {
 +       var = 0;
 +    }
 }}}

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3210#comment:17>
GRASS GIS <https://grass.osgeo.org>