[GRASS-dev] [GRASS GIS] #3810: r.external.out: format parameter wish

[GRASS GIS]

#3810: r.external.out: format parameter wish
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  Reporter:  neteler      |      Owner:  grass-dev@…
      Type:  enhancement  |     Status:  closed
  Priority:  normal       |  Milestone:  7.8.0
 Component:  Raster       |    Version:  svn-trunk
Resolution:  invalid      |   Keywords:  r.external.out, GDAL
       CPU:  Unspecified  |   Platform:  Unspecified
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Changes (by mmetz):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 Replying to [ticket:3810 neteler]:
 > So far r.external.out does not allow to enforce the output format as
 r.out.gdal does. A new parameter would be nice to have for this.
 >
 > Rationale: writing out NDVI * 1000 as Int16 is currently not possible
 with r.external.out as NBITS=16 isn't properly accepted (GDAL refuses to
 accept it as currently Int32 is written out).

 This is not concerning the format, but the datatype. The name of the
 module is
 {{{
 r.external.out - Redirects raster output to file utilizing GDAL library
 rather than storing in GRASS raster format.
 }}}

 That means all raster output is written in the selected GDAL format.
 Obviously the datatype can vary, depending on which raster output is
 created.

 In this example, writing out as Int16 is only possible if all cell values
 fit into Int16. But all cell values are not known when writing out, i.e.
 you need to write out the raster in GRASS native format and then determine
 which GDAL datatype is suitable to store the GRASS raster map. In this
 case you need to use r.out.gdal.

-- 
Ticket URL: <https://trac.osgeo.org/grass/ticket/3810#comment:1>
GRASS GIS <https://grass.osgeo.org>