[Qgis-user] (no subject) - Compressing Raster

[Etienne Tourigny]

RIght, sorry about the confusion. You should file a feature request ticket
for this, it is not a simple as it seems.

Etienne


On Tue, Jul 29, 2014 at 2:39 PM, Alex Mandel <tech_dev at wildintellect.com>
wrote:

> On 07/29/2014 10:31 AM, Etienne Tourigny wrote:
> > On Tue, Jul 29, 2014 at 1:10 PM, Alex Mandel <tech_dev at wildintellect.com
> >
> > wrote:
> >
> >> On 07/29/2014 01:45 AM, Peter Versteeg wrote:
> >>> thank you very much for the email.
> >>>
> >>>
> >>>
> >>> I think I am almost there. I have set the compression to LZW and did a
> >>> export and I did a export on high compression. Both are still really
> big.
> >>>
> >>>
> >>>
> >>> in your first mail you explained about:
> >>>
> >>>
> >>>
> >>>             The type of number stored dictates a large amount of
> >> overhead,
> >>> there is
> >>>                 a huge difference between Integer and Float.
> >>>
> >>>                 -co COMPRESS=LZW  -ot Int16
> >>>
> >>>                 See http://www.gdal.org/gdal_translate.html for
> options.
> >>> Pick the
> >>>                 smallest type of number storage that holds your data
> >>> correctly. Most
> >>>                 GDAL tools will default to Float, that is likely the
> >>> difference.
> >>>
> >>>
> >>>
> >>> In the save raster as window where i also set the compress to LZW i did
> >> try
> >>> to ad a line but i do not know what to type.
> >>>
> >>> name: Int value 16 or name ot value int16 all do not work.
> >>>
> >>>
> >>>
> >>> Can you tell me what line to write
> >>>
> >>>
> >>>
> >>> gr Peter
> >>>
> >>
> >> As I said in my previous email:
> >> If that still isn't enough use GDAL Translate found on the Raster menu
> >> under Conversion. There you will be able to set all the possible
> options.
> >>
> >> Basically the options are not in the Save As dialog. I will talk to the
> >> developers about adding more options.
> >>
> >
> > You can do pretty much the same things as in the GDAL Translate tool -
> see
> > the "Creation Options" group box. What is missing exactly?
>
> -ot is missing, which lets you set the number type int/float etc
>
> I have not tested if the save as dialog allows this, I was guessing that
> only -co options were allowed in the Create Options section. -ot is not
> a -co option, its a separate flag for gdal.
>
> Thanks,
> Alex
>
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20140729/94b859e8/attachment.html>