[GRASS-dev] [GRASS GIS] #3485: Introduce a new 64-bit integer raster data type

GRASS GIS trac at osgeo.org
Fri Feb 16 06:33:04 PST 2018

#3485: Introduce a new 64-bit integer raster data type
  Reporter:  mlennert     |      Owner:  grass-dev@…
      Type:  enhancement  |     Status:  new
  Priority:  normal       |  Milestone:  8.0.0
 Component:  LibRaster    |    Version:  svn-trunk
Resolution:               |   Keywords:  raster 64-bit
       CPU:  Unspecified  |   Platform:  Unspecified

Comment (by mlennert):

 Replying to [comment:1 mmetz]:
 > Replying to [ticket:3485 mlennert]:
 > > From #3084:
 > >
 > > "Most importantly, a GRASS raster format for 64-bit signed integer.
 Note that GDAL does not support 64-bit signed or unsigned integers. The
 reason is probably that a portable implementation of 64-bit integers is
 not so easy. Regarding GRASS raster processing, the need for 64-bit
 integers usually arises only for raster maps with more than 2,147,483,647
 cells which in turn usually requires Large File Support (LFS). Therefore
 the check for the availability of a 64-bit integer could be coupled to
 LFS. If support for 64-bit signed integer raster maps (say, LCELL) could
 be added to GRASS, users would need to stick to GRASS since GDAL raster
 export of 64-bit integers is not available. Interesting idea."
 > A 64 bit signed integer type has been added to trunk with r72230.
 Various other projects, e.g. GDAL, SQLite, HDF5, Python also have some 64
 bit signed integer type. In order to avoid namespace collision, the new
 type has been defined as grass_int64 and LCELL. GRASS libraries and
 modules do not yet make use of this type. Defining a 64 bit signed integer
 type has been tested on Linux + gcc, FreeBSD + clang, and MS Windows + gcc

 Great, thanks a lot, Markus !

 What is the roadmap from here, not in terms of calendar, but in terms of
 tasks that need to be done to actually be able to use this new integer
 type ?

Ticket URL: <https://trac.osgeo.org/grass/ticket/3485#comment:2>
GRASS GIS <https://grass.osgeo.org>

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