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 <mailto: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 <mailto: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
<mailto: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-
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