[Qgis-user] QField

[Matthias Kuhn]

Hi Andreas,

It's all on the page in the QField docs on the link in my last mail :)

Matthias

On 09/22/2016 10:06 AM, Neumann, Andreas wrote:
> Hi Matthias,
> 
> Oh - thanks for the hint. So probably Reginald is just missing the
> pyramids in the geopackage - to be created, f.e. with gdaladdo.
> 
> Andreas
> 
> On 2016-09-22 09:56, Matthias Kuhn wrote:
> 
>> QField does not (yet) support tiff with jpeg compression.
>>
>> See:
>> http://www.qfield.org/docs/project-management/dataformat.html#raster-data
>>
>> GeoPackage worked quite nice in our experience and can also be built
>> in different resolutions (same page further down).
>>
>> Matthias
>>
>>
>> On 09/22/2016 09:37 AM, Neumann, Andreas wrote:
>>> Hi Reginald,
>>>
>>> You can use the JPEG compression inside Geotiff. Note that this can be
>>> specified separately for both the full resolution and the pyramids. You
>>> can also select the compression factor to decrease the file size in
>>> trade off with quality.
>>>
>>> See
>>> also http://www.gdal.org/frmt_gtiff.html and
>>> http://www.gdal.org/gdaladdo.html for
>>> details.
>>>
>>> I believe that modern QGIS versions have these options exposed in the
>>> GUI, but probably not as default.
>>>
>>> So maybe there is room for potential to get a smaller size Geotiff.
>>>
>>> Greetings,
>>> Andreas
>>>
>>> On 2016-09-22 09:32, Reginald Carlier wrote:
>>>
>>>> Thanks Andreas,
>>>>
>>>>  
>>>>
>>>> Creating a Geotiff with pyramids did the trick. The only disadvantage
>>>> is that it created a file of about 1.7 GB (the original was 90 MB).
>>>>
>>>> Now I am ready to test the app J.
>>>>
>>>>  
>>>>
>>>> Regards,
>>>>
>>>>  
>>>>
>>>> *Van:*Neumann, Andreas [mailto:a.neumann at carto.net
>>>> <mailto:a.neumann at carto.net>]
>>>> *Verzonden:* woensdag 21 september 2016 16:19
>>>> *Aan:* Reginald Carlier
>>>> *Onderwerp:* Re: [Qgis-user] QField
>>>>
>>>>  
>>>>
>>>> Hi Reginald,
>>>>
>>>> Did you create pyramids in the gpkg rasters?
>>>>
>>>> Generally, Geotiff should be well supported - definitely more tested
>>>> than gpkg rasters. I had a 1GB geotiff on qfield (on SD-Card) and it
>>>> displays fast. I haven't tested vrt files with geotiffs - if it works
>>>> as well?
>>>>
>>>> Andreas
>>>>
>>>> On 2016-09-21 15:44, Reginald Carlier wrote:
>>>>
>>>>     Hi Erwan,
>>>>
>>>>      
>>>>
>>>>     You can look in the list of last week where I posted a couple of
>>>>     questions about qfield and was pointed to the right website for
>>>>     documentation.
>>>>
>>>>     I succeeded to publish a map on my phone but the aereal photo
>>>>     which was published as a gpkg file doesn't render. When I use the
>>>>     raster.gpkg on my desktop it renders but very slow.
>>>>
>>>>     The gpkg file was created from a 90 MB jp2 file.
>>>>
>>>>      
>>>>
>>>>     Regards,
>>>>
>>>>      
>>>>
>>>>      
>>>>
>>>>      
>>>>
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>>>>  
>>>>
>>>>  
>>>>
>>>  
>>>
>>>  
>>>
>>>
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>  
> 
>