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<mailto: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<mailto:Jump-pilot-devel@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
two_attribute_union.jml
Description: two_attribute_union.jml
------------------------------------------------------------------------------ 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
