Hi Michaël,
If you use Save Selected Datasets, OJ already breaks out shapefile layers
into mutiple files.
regards,
Larry
2010/10/8 Michaël Michaud <michael.mich...@free.fr>
> Hi,
>
> Agree with Matthias, there are two things.
>
> I would consider first one as a OJ bug. OJ could export empty geometries
> as null shapefiles but it does not (I will fill a bug report).
>
> For the mixed shapetype problem, I'm tempted to write a feature request
> but I'm not sure what I would prefer :
> - a shapefile exporter which would export mixed shape files in several
> files (layer-point.shp, layer-line.shp...)
> - use the Edit>Extract>Extract by geometry type, add an
> ExportLayersPlugIn able to export several layers without prompting for
> names
>
> Any idea ?
>
> Michaël
>
> Le 07/10/2010 15:07, Matthias Scholz a écrit :
> > Hi Jukka,
> >
> > I've never used this plugin, but I know this problems with empty
> > schapefiles.
> >
> > In the first case with no geometries it is impossible to determine the
> > geometry type, which is usualy done from a geometry. The geometry type
> > is mandatory for writing a schapefile. Byte 32 in the header is the type
> > field. A solution for such a problem may be a JComboBox to get a valid
> > type from the user or write the shapefile with type 0 "Null Shape".
> > Later if we have real geometries in the file we can change the type
> > field in the header. Don't know if other systems have problems with
> > "Null Shape" files?
> >
> > The second problem with mixed geometries is a design problem of shape
> > fiiles. At the moment are only one geometry type in one file allowed.
> > It's possible that this will be changed in the future.
> > So I see two solutions. Frist you use Edit->Extract->Extract Layers by
> > Geometry Type and save all the layers manualy. The second possibillity
> > is that we extend the ShapefileWriter for splitting this automatically.
> >
> > You can read this in the specs
> > http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf. See page 4
> > and 5.
> >
> > Matthias
> >> Hi,
> >>
> >> JUMP DB Query plugin http://jumpdbqplugin.sourceforge.net/ used to
> >> create a little polygon as a fake geometry for all the lines which
> >> the SQL query was returning without a geometry. Now the new versions
> >> of the plugin, starting from version 0.7.2. are creating an empty
> >> geometry as "GEOMETRYCOLLECTION EMPTY".
> >> This works fine as long as I am working with OpenJUMP and also saving
> >> into JUMP jml format goes OK. But saving into shapefiles gives
> >> problems and I have not discovered how I could keep the important
> >> attribute data that I have also for the features without geometry.
> >>
> >> If there are no other geometries on the layer, the OJ message while
> >> doing shapefile save is
> >>
> >> java.lang.Exception: Could not determine shapefile type - data is
> >> either all GeometryCollections or empty
> >> at
> >>
> com.vividsolutions.jump.io.ShapefileWriter.makeSHAPEGeometryCollection(ShapefileWriter.java:728)
> >> at
> >>
> com.vividsolutions.jump.io.ShapefileWriter.write(ShapefileWriter.java:295)
> >> at
> >>
> com.vividsolutions.jump.io.datasource.ReaderWriterFileDataSource$1.executeUpdate(ReaderWriterFileDataSource.java:72)
> >> at
> >>
> com.vividsolutions.jump.workbench.datasource.AbstractSaveDatasetAsPlugIn.run(AbstractSaveDatasetAsPlugIn.java:33)
> >> at
> >>
> com.vividsolutions.jump.workbench.ui.task.TaskMonitorManager$TaskWrapper.run(TaskMonitorManager.java:151)
> >> at java.lang.Thread.run(Unknown Source)
> >> If there are also real geometries then the message is
> >>
> >> om.vividsolutions.jump.io.IllegalParametersException: mixed geometry
> >> types found, please separate Polygons from Lines and Points when
> >> saving to *.shp
> >> at
> >>
> com.vividsolutions.jump.io.ShapefileWriter.checkIfGeomsAreMixed(ShapefileWriter.java:639)
> >> at
> >>
> com.vividsolutions.jump.io.ShapefileWriter.write(ShapefileWriter.java:253)
> >> at
> >>
> com.vividsolutions.jump.io.datasource.ReaderWriterFileDataSource$1.executeUpdate(ReaderWriterFileDataSource.java:72)
> >> at
> >>
> com.vividsolutions.jump.workbench.datasource.AbstractSaveDatasetAsPlugIn.run(AbstractSaveDatasetAsPlugIn.java:33)
> >> at
> >>
> com.vividsolutions.jump.workbench.ui.task.TaskMonitorManager$TaskWrapper.run(TaskMonitorManager.java:151)
> >> at java.lang.Thread.run(Unknown Source)
> >> Is it possible to save things without geometries into shapefiles at
> >> all? It is easy to generate test data, just create a new layer and
> >> insert a new WKT feature as GEOMETRYCOLLECTION EMPTY and try to save
> >> the layer. Next digitise a point, for example, on the layer, and try
> >> saving again.
> >>
> >>
> >> -Jukka Rahkonen-
> >> ------------------------------------------------------------------------
> >>
> >>
> ------------------------------------------------------------------------------
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> >>
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> >>
> >
> >
> ------------------------------------------------------------------------------
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> >
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>
>
> ------------------------------------------------------------------------------
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> Spend less time writing and rewriting code and more time creating great
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Spend less time writing and rewriting code and more time creating great
experiences on the web. Be a part of the beta today.
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