[Qgis-developer] Geospackage Slow in QGIS

[G. Allegri]

2014-05-17 16:04 GMT+02:00 Andrea Peri <aperi2007 at gmail.com>:

> Hi Giovanni.
>
> You have point an interesting question.
> The question is:
>
> geopackage and spatialite will be binary compatible (almost in the blob
> where there are store the geometry) ?
> I guess no because I don't realize how a geopackage spec could support
> some different binary formats.
>

No, the Geopackage BLOB is different from Spatialite. Have a look to the
paragraph 2.1.3.1.1 in the Geopackage specification.


>
> If this is true (i cannot be sure now, hope wrong obviously)
> this mean that will be another different format in a sqlite.
>

The Luciad libgpkg has a compatibility mode for Spaltialite 1.x,2.x and
3.x, which *should* guarantee read/write correctness for Spatialite layouts.
Anyway, GDAL has its own implementation, and the gpkg driver is strictly
directed to the Geopackage layout.


>
> The first is spatialite, the second is the porting of qgis to spatialite,
> the third is this next coming version of geopackage on spatialite.
>

Yes, it will be a mess! :)
When you will receive e sqlite DB what of the three forms will it be? Trial
and error, if you don't know it ;)

giovanni


>
> A.
>
>
>
> 2014-05-17 14:45 GMT+02:00 G. Allegri <giohappy at gmail.com>:
>
>  The spatialite will never to be a real interchange format if the only
>>> software to use it is qgis and the same qgis is not real compatible with
>>> the original spatialite spec.
>>>
>>> So the spatialite actually is a really good and strong work format .
>>>
>>> Instead surely geopackage are no one strong point in elaboration so I'm
>>> not surprise that it is slow.
>>>
>>>
>> As you will know the GeoPackage SQLite Extension is pending for future
>> versions of the specification. In case it would make Spatialite/Geopackage
>> purposesquite similar...
>>
>> giovanni
>>
>>
>>
>>>
>>> Il 17/05/2014 11:24, Paolo Cavallini ha scritto:
>>>
>>>  Il 17/05/2014 11:03, Andrea Peri ha scritto:
>>>>
>>>>> Do you know the requirements of gpkg ?
>>>>>
>>>> They should be really minimal.
>>>> This could help understanding speed issues:
>>>> http://openjump.blogspot.fi/2014/02/openjump-plus-reads-
>>>> ogc-geopackages.html
>>>> All the best.
>>>>
>>>
>>> _______________________________________________
>>> Qgis-developer mailing list
>>> Qgis-developer at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>>>
>>
>>
>>
>> --
>> Giovanni Allegri
>> http://about.me/giovanniallegri
>> Twitter: https://twitter.com/_giohappy_
>> blog: http://blog.spaziogis.it
>> GEO+ geomatica in Italia http://bit.ly/GEOplus
>>
>
>
>
> --
> -----------------
> Andrea Peri
> . . . . . . . . .
> qwerty àèìòù
> -----------------
>



-- 
Giovanni Allegri
http://about.me/giovanniallegri
Twitter: https://twitter.com/_giohappy_
blog: http://blog.spaziogis.it
GEO+ geomatica in Italia http://bit.ly/GEOplus
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