[GRASS-dev] Re: [GRASS GIS] #335: export floats and doubles with correct precision

GRASS GIS trac at osgeo.org
Sun Aug 16 05:00:12 EDT 2009

#335: export floats and doubles with correct precision
  Reporter:  hamish       |       Owner:  grass-dev at lists.osgeo.org
      Type:  task         |      Status:  new                      
  Priority:  critical     |   Milestone:  6.4.0                    
 Component:  default      |     Version:  unspecified              
Resolution:               |    Keywords:  precision                
  Platform:  Unspecified  |         Cpu:  Unspecified              
Comment (by hamish):

 on grass-dev Glynn wrote:
 > We can assume that it always refers to IEEE 754 double
 > precision format. Systems where this isn't the case are
 > extremely uncommon, and will almost certainly fail to
 > support GRASS without a great deal of additional effort.

 > And regardless of the precision of "double", I seriously
 > doubt that anyone has actual data which is accurate to 15
 > significant digits (equivalent to specifying the circumference
 > of the earth to within 40 nanometres, or the height of Everest
 > to within 9 picometres).

 r.colors fixed in trunk with r38750, r38752.
 (see also #720)


Ticket URL: <https://trac.osgeo.org/grass/ticket/335#comment:8>
GRASS GIS <http://grass.osgeo.org>

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