Hi Jukka,
Thank you for your answer, I was almost sure that Beanshell Attribute
Calculator can handle it with some awkward syntax. Do we already have
documentation about Attribute Calculator or could you create for
example an empty page into wiki as a bookmark?
I added some information in the wiki :
http://ojwiki.soldin.de/index.php?title=Beanshell_Attribute_Calculator
It's difficult to imagine every area where a calculated attribute may
help, but let's improve the example part as it comes
The road example is like reverse engineering the resultu of dynamic
segmentation which has materialized by splitting the segments
physically and thus is might be of some general interest.
OpenStreetMap road data fits also this definition. By dropping
unnecessary tags the number of linestrings could be decreased by
intelligent merging.
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
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 <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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