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

Newcomb, Doug doug_newcomb at fws.gov
Tue Jan 30 08:04:47 PST 2018


On Mon, Jan 29, 2018 at 4:08 AM, GRASS GIS <trac at osgeo.org> wrote:

> #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
>  Keywords:  raster 64-bit  |        CPU:  Unspecified
>  Platform:  Unspecified    |
> ---------------------------+-------------------------
>  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."
>  and
>  "As of r68944, i.segment supports regions with more than 2,147,483,647
>  cells, but the number of final objects must not exceed 2,147,483,647. This
>  can only be solved by introducing a new 64 bit integer data type in
>  addition to CELL, FCELL, DCELL, something for GRASS 8 maybe."
> --
> Ticket URL: <https://trac.osgeo.org/grass/ticket/3485>
> GRASS GIS <https://grass.osgeo.org>
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Doug Newcomb
551F Pylon Dr
Raleigh, NC
919-856-4520 ext. 14 doug_newcomb at fws.gov
The opinions I express are my own and are not representative of the
official policy of the U.S.Fish and Wildlife Service or Dept. of the
Interior.   Life is too short for undocumented, proprietary data formats.
*NOTE: This email correspondence and any attachments to and from this
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