[Qgis-developer] RasterFileWriter creates 5 times bigger geotiff then gdal_translate

[Radim Blazek]

On Sat, Jul 5, 2014 at 8:17 PM, G. Allegri <giohappy at gmail.com> wrote:
> Sorry for the buzz. It's not QGIS fault, it's GDAL itself which reads the
> ASCII Grid as Float64, but I wonder why contrarily gdalinfo and
> gdal_translate treats it as Float32...

Float64 in QGIS layer properties metadata Data Type and gdalinfo
giving Float32 on the same file?

Radim

>
> 2014-07-05 18:56 GMT+02:00 G. Allegri <giohappy at gmail.com>:
>
>> I haven't spot tha exact point where this happens but QGIS exports
>> Float64, even if the origin was Float32.
>>
>> giovanni
>>
>>
>> 2014-07-05 16:54 GMT+02:00 G. Allegri <giohappy at gmail.com>:
>>
>>> Causally I hit the save as raster dialog, and I tried to export a raster
>>> to layer (coming from an ASCII Grid source) to Geotiff, with no creation
>>> options set.
>>> The result was a file 3 times bigger then the original ASCII, and 5 times
>>> bigger then the Geotiff created by gdal_translate.
>>>
>>> gdalinfo on the files give same results (except statistics missing from
>>> the one created by RasterFileWriter).
>>> Does gdal_translate do some optimizations that RFW doesn't?
>>> I wasn't aware that two Geotiffs, apparently with the same properties,
>>> could be so different in size...
>>>
>>> giovanni
>>>
>>> --
>>> Giovanni Allegri
>>> http://about.me/giovanniallegri
>>> Twitter: https://twitter.com/_giohappy_
>>> blog: http://blog.spaziogis.it
>>> GEO+ geomatica in Italia http://bit.ly/GEOplus
>>
>>
>>
>>
>> --
>> Giovanni Allegri
>> http://about.me/giovanniallegri
>> Twitter: https://twitter.com/_giohappy_
>> blog: http://blog.spaziogis.it
>> GEO+ geomatica in Italia http://bit.ly/GEOplus
>
>
>
>
> --
> Giovanni Allegri
> http://about.me/giovanniallegri
> Twitter: https://twitter.com/_giohappy_
> blog: http://blog.spaziogis.it
> GEO+ geomatica in Italia http://bit.ly/GEOplus