On Thu, 5 Dec 2019 at 17:35, Alexander Bruy <alexander.b...@gmail.com> wrote: > > There is a FlatGeoBuf [0], probably we can use it or at least get some ideas. > > [0] https://github.com/bjornharrtell/flatgeobuf
FlatGeoBuf indeed looks very exciting! But to be honest, I think an easier path would be just to directly serialize the qgis features to disk -- we already have QgsFeature::operator<< and >> to read and write features to data streams (without loss of any information), so we could utilise those during the disk read/write. Nyall > > чт, 5 груд. 2019 о 09:18 Richard Duivenvoorde <rdmaili...@duif.net> пише: > > > > On 05/12/2019 01.01, Nyall Dawson wrote: > > > What's needed/missing is a method for the memory data provider to > > > detect when a layer is growing too large, and start writing this out > > > to disk. (Important note: we CAN'T use any of the standard spatial > > > formats for this (as they are lossy when compared to the memory > > > provider support), so we'd need to directly serialize the memory layer > > > features to a custom binary format, with indexing support for rapid > > > retrieval of features. > > > > If I understand correct, FME is also working with (indexed) temp files? > > I'm not an FME user, so I can bu wrong, but I always wondered what kind > > of format that is... > > > > IF we (as FOSS community) could come up with some (new?) indexed file > > format, it (besides being a in-between product for transformations) also > > a potential data exchange format (maybe some zipped version of file+index?)? > > > > Anybody into this? > > > > Regards, > > > > Richard Duivenvoorde > > _______________________________________________ > > QGIS-Developer mailing list > > QGIS-Developer@lists.osgeo.org > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > > > -- > Alexander Bruy _______________________________________________ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
