Jukka, Thanks for the feedback The bug you discovered should be fixed
Michaël > Hi Michaël, > > Michael Michaud wrote: > >> Hi Jukka, >>>> I see. A solution would be to replace current options "Use an attribute", >>>> "Attribute" by a list of actual attributes with a checkbox for each one. >>>> In this case, maybe we should split the tool again to have >>>> - union/merge (a selection or a layer), keeping only the merge option (+ >>>> option to split non adjacent linestrings ?) >>>> - dissolve/merge (a layer) : same options + list of all attributes (with >>>> checkboxes) + aggregate unused attributes >>> How about having two options for the unused attibutes: Aggregate unused >>> attributes/Discard unused attributes. The latter would remove the unused >>> columns from the schema of the new union layer. What I have in my mind is >>> to cut down file size by cutting down the number of features and by >>> removing unnecessary attributes. Of course the latter is quite easy to do >>> from "Edit Schema". >> Just committed a new "dissolve" plugin (coming just after union plugin) : >> check r4050+ >> Compared to union plugin : >> - it works only on a layer, not on a feature selection >> - it can use several attributes to dissolve, not just one >> - it can optionally explode multi-geometries at the end >> - it can optionally remove unused attributes from the schema >> - there is no option to ignore null attributes >> - there is no option to aggregate unused attribute >> Please, let me now if it fits your use case and/or if you see any >> improvements >> to make it more usable. > This is going to be a fine tool to have in the analysis toolbox. I made a > test with road data which are natively dynamically segmented but split into > physical segments for standard GIS programs. There are quite many attributes > used for splitting which leads to very short segments. By taking the two > attributes I really need I can reduce the number of linestrings very much, > for example from 911 to 31. However, using this fine dissolve tool reveals > new oddities from the data which may lead to further questions and > suggestions but I must play with the data a little bit more first. > > I did find something that feels like a bug. When the Dissolve tool it is run > for the first time it appears to memorize the attribute list and it can only > be cleared by closing OpenJUMP. To reproduce dissolve one layer by attribute > "speed". Next try to dissolve another layer which do not have "speed" as > attribute. The boxes for selecting attributes show the right attributes but > trying to run dissolve leads to an error: > > java.lang.IllegalArgumentException: Unknown attribute name: speed > at > com.vividsolutions.jump.feature.FeatureSchema.getAttributeIndex(FeatureSchema.java:97) > at > com.vividsolutions.jump.feature.AbstractBasicFeature.getAttribute(AbstractBasicFeature.java:103) > at > org.openjump.core.ui.plugin.tools.DissolvePlugIn.computeKeyFromAttributes(DissolvePlugIn.java:245) > at > org.openjump.core.ui.plugin.tools.DissolvePlugIn.run(DissolvePlugIn.java:207) > at > com.vividsolutions.jump.workbench.ui.task.TaskMonitorManager$TaskWrapper.run(TaskMonitorManager.java:152) > at java.lang.Thread.run(Unknown Source) > > -Jukka- > >> Michaël > > Michaël > > > -Jukka- > ________________________________________ > Michael Michaud wrote: > Hi Jukka, > > As you guessed, I generally solve this kind of problem with a calculated > attribute. > There are a few things to know for that. > For numeric attributes, you can do as you suggested : 100*A + B > For string attributes, use + to concatenate attributes and don't omit to add > a separator : A + ";" + B > If your expression starts with "", + will concatenate fields, even numerics : > "" + 1 + 2 -> 12 > So the following expression should work in almost all cases > "" + A + ";" + B > (did not check for dates) > > Accepting several attributes in the union/dissolve user interface would be > nice, but > it needs some more work (especially if we want to be able to add/remove fields > from the dialog in order to manage any number of attributes). > Please, add a Feature Request for that. > > Michaël > > > -Jukka- > ________________________________________ > Landon Blake wrote: > So it sounds like adjacency will be important too? In other words...we don't > want to merge features that aren't adjacent or topologically connected? > > Landon > > On Wed, Sep 10, 2014 at 1:43 PM, Landon Blake <sunburned.surve...@gmail.com> > wrote: > Interesting use case Jukka. Let me think about how this might work as a > plug-in. > > Landon > > On Sun, Sep 7, 2014 at 1:47 PM, Rahkonen Jukka (Tike) > <jukka.rahko...@mmmtike.fi> wrote: > Hi Landon, > > My case last week was about parcel IDs and landuse codes and aim was to union > areas so that polygons with same landuse and belonging to same owner would > make one polygon. > > For another use see attached images and source data in Jump JML format. Data > could present two highways with ref. IDs "100" and "200". Both highways have > sections with speed limits "60" and "80". Aim is to merge segment of highway > "100" with speed limit "80" together etc. > > Image one: Original segmented data > Image two: Desired end result. Notice an extra: Highway "100" has speed limit > "60" in two distinct places. I do not want them to be combined into > multilinestring. OJ can handle this case with two subsequent operations: > Merge selected features + Explode selected features. > > -Jukka Rahkonen- > > > > > > ________________________________________ > Lähettäjä: Landon Blake [sunburned.surve...@gmail.com] > Lähetetty: 7. syyskuuta 2014 22:10 > Vastaanottaja: OpenJump develop and use > Aihe: Re: [JPP-Devel] Union/dissolve by several attributes > Jukka: > Can you give me some more details on the actual union you are trying to > accomplish? What do you integer attributes represent? > > Thanks. > > Landon > > On Wed, Sep 3, 2014 at 4:21 AM, Rahkonen Jukka (Tike) > <jukka.rahko...@mmmtike.fi> wrote: > Hi, > > I would like to union features by two or perhaps more attributes. I wonder if > the current Union/Dissolve/Merge tool could be developed to support the use > of combined classes. In my use case I have two integer attributes which > define the classes and it is a bit tricky to calculate a new concatenated > field from those. Perhaps it is possible to do with the Beanshell Attribute > Calculator but it is not obvious for me how. An example: I have two integer > attributes and I would like to concatenate their values to one field which I > would like to use for merging later. If the attribute values are A=80 and > B=20, how could I conbine them into "80-20" or something like that? Well, in > this case I could do (100xA)+B=8020 but what to do if I had also strings to > concatenate as A=80 and B=true? I can do the task fine with Spatialite but it > would be a bit more fluent to do everything with OpenJUMP. > > -Jukka Rahkonen- > > ------------------------------------------------------------------------------ > Slashdot TV. > Video for Nerds. Stuff that matters. > http://tv.slashdot.org/ > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > ------------------------------------------------------------------------------ > Slashdot TV. > Video for Nerds. Stuff that matters. > http://tv.slashdot.org/ > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > > ------------------------------------------------------------------------------ > Want excitement? > Manually upgrade your production database. > When you want reliability, choose Perforce > Perforce version control. Predictably reliable. > http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk > > > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > ------------------------------------------------------------------------------ > Want excitement? > Manually upgrade your production database. > When you want reliability, choose Perforce > Perforce version control. Predictably reliable. > http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk > > > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > > ------------------------------------------------------------------------------ > Want excitement? > Manually upgrade your production database. > When you want reliability, choose Perforce > Perforce version control. Predictably reliable. > http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk > > > > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > ------------------------------------------------------------------------------ > Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer > Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports > Are you Audit-Ready for PCI DSS 3.0 Compliance? 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