RE: [fme] ListExploder Error?

Wed, 25 May 2005 08:23:23 -0700

Title: Message
Hi Scott,
 
Sorry, I failed to connect this with your previous question.  Obviously the procedure I outlined won't work properly with overlapping area features creating multiple points.  I'm glad you found something that works.
 
Have you had a chance to check this in a recent build of FME to see if it's still a bug?  If so, please report it to [EMAIL PROTECTED] so that the rest of us can benefit from your pain :)
 
Jason

From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Cifelli, Scott T.
Sent: Tuesday, May 24, 2005 17:09
To: [email protected]
Subject: [fme] ListExploder Error?

Jason,
 
Actually, you were correct the first time.  The altered stream needed to be the Requestor, as this stream now had the additional features from the listexploder.  The problem is that I ended up back where I started.  I was getting the correct number of features, but the geometry was still incorrect.  So then I decided to expose the geometry types to see what was going on.  For some reason the resultant text features (after the list exploder) had the fme_geometry set to "fme_point", but the fme_type was set to "fme_area".  I then used an AttributeSetter transformer to force the exposed fme_type attribute to "fme_text" and it worked!  Of course, this only worked because the feature type was actually a text feature (and hence had all the other attributes that it needed), but for some reason it was getting confused with the fme_type attribute.
 
At any rate, thanks again for all your help.  Sometimes it takes a little re-thinking (and some good advice from this group!) to get a process to work.  I appreciate the help.  Also, thanks to SRG for weighing in on the issue.
 
Cheers,
Scott
 
-----Original Message-----
From: Jason Birch [mailto:[EMAIL PROTECTED]
Sent: Thursday, May 19, 2005 6:57 PM
To: [email protected]
Subject: RE: [fme] ListExploder Error?

Arg. 
 
I meant, use the second unaltered stream as the Requestor and the first stream as the Supplier.  It would work the other way, but you'd have to use the Referenced and Unreferenced output ports instead of the Complete and Incomplete ports.  And it woud be more confusing (to me at least) :)
 
Jason

From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Jason Birch
Sent: Thursday, May 19, 2005 10:48
To: [email protected]
Subject: RE: [fme] ListExploder Error?

I can't duplicate your error in a recent beta.  Does the ListExploder you're using allow you options on what attributes to keep as part of the explode?  If so, maybe changing it to "Lean" or "Lean and Mean" (the descriptions of these have changed in recent releases) would help.  If not, is it an option to upgrade to a recent beta?
 
I can think of a couple workarounds that might work, but these are just guesses. 
 
First guess: run the features through a Counter, and then split them into two streams.  The first stream goes through the PointOnAreaOverlayer and the ListExploder, followed by an AttributePrefixer to identify that these attributed were from this stream.    Then put a FeatureMerger inline, using the first stream as the Requestor and the second stream as the Provider, using the Counter attribute as the join item and making sure the merge attributes only.  You can then use an AttributeRenamer and AttributeKeeper as required.  This method keeps the original geometry intact but still allows you to benefit from the attributes picked up as part of the PointOnAreaOverlayer.
 
Second guess:  after forcing the geometry to fme_point, try setting the relevant autocad_* attributes (autocad_entity=autocad_text, autocad_text_size, autocad_text_string, etc).  If this doesn't work, maybe a LabelPointReplacer would do the trick?
 
Jason

From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Cifelli, Scott T.
Sent: Thursday, May 19, 2005 08:52
To: [email protected]
Subject: RE: [fme] ListExploder Error?

SRG,
 
Sorry, but I'm not sure what you mean by an attributepreserver?  Do you mean attribute keeper?  Also, I did run a test translation with the listexploder transformer removed and the file output was correct.  The problem is that I need the list exploder to get a full copy of the data for each polygon in the overlay.
 
Cheers,
Scott
 
-----Original Message-----
From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Raghavendran(SRG)
Sent: Thursday, May 19, 2005 1:17 AM
To: [email protected]
Subject: Re: [fme] ListExploder Error?

Hello Scott,
Could you try inserting a attributepreserver before you do the overlay and see if the geometry attributes are maintained.
Happy FME-ing :-)
Cheers
SRG

--------------------------------------------------------------------------------------------

I am running an overlay of points (AutoCAD dwg format) and areas (ESRI shapefile) thru a PointOnAreaOverlayer Transformer in Workbench (build 1625), creating a list and then using a ListExploder transformer to write out the data.  The problem is that the data entering the ListExploder is definitely point data (text data from the dwg file), but the output seems to be area geometry.  I don't understand why this is happening.  I am doing the same exact process with lines and it works fine. 

I've attached a snapshot of the workbench file that shows the data flow as well as the log file to demonstrate what is happening.  You can see that I inserted a GeometryFilter Transformer to debug exactly what geometries I am getting, and sure enough the points are magically turning into areas.  Is it possibly a bounding box around the text that is being returned?

Note that I did attempt to force the geometry back to a point after the ListExploder Transformer, and this worked, except that the data was now truly a point and no longer a text geometry in the dwg file, and ultimately not useful. 

Has anyone else experienced this problem?  Any suggestions welcome.

Cheers,

Scott Cifelli
GIS Systems

<<ListExploderError.jpg>>



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