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Dissolve error in Model Builder ArcGIS 10.1

MatthiasMohaupt

Hello,
I´m trying to do a simple dissolve task in Model Builder 10.1 which worked fine in ArcGIS 10. It also works as desired when I use the tool outside the Model Builder. Strangely, besides the fact that the number of features is falsely increasing after running dissolve, the output is singlepart although I checked the multipart option and the input is a multipart feature class.
Any suggestions?
Thanks!

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MicheleH_DNReply

I have not had this problem since moving to 10.2. If you can move I would say go ahead.

MikeVolz

Does anyone know if this issue still exists in ArcGIS v10.2.x? I ask because a model in modelbuilder using the dissolve tool is not working in v10.2.0.

Was anyone encountering this problem using SDE data that was stored using ST_Geometry?

curtvprice

Try using the dissolve tool from inside ArcCatalog instead of ArcMap. This works for me.

This makes me suspect the issue may involve data types. In ModelBuilder, often you are creating output in the scratch workspace (intermediate data) as part of a processing chain. In ArcCatalog, you may be working with a differerent scratch workspace.

Is it possible the problem is with shapefile workspaces (folder) not giving the same dissolve results as geodatabase workspaces?

I see no mention of service packs, and the thread dropped off a whiel back. Perhaps an update to 10.1 SP1 or 10.2 would help?

DavidBoyd

For what it's worth, I'm having the same problem. I just created a model including a dissolve (10.1) based on a numeric field. It's runs fine without error, but the resulting data isn't dissolved into multipart shapes even though that option is checked. I can run the dissolve outside of the model successfully, but this kind of makes my model useless. Has anyone found the cause of this...or is it maybe a bug?

tarohosoe

Try using the dissolve tool from inside ArcCatalog instead of ArcMap. This works for me.

bridgetsullivan

I am having dissolve issues with both python and using the dissolve data management geoprocessing tool. They both work with no Dissolve Fields(s) options checked but fail when fields are selected. Script worked at version 10 but is not working at 10.1 sp1

MartynMcGuinness

I have been doing more testing and most of the time I am unable to get Multipart polygons out of the Dissolve tool whether it is run in a model, as a stand alone tool or activated through the python window in ArcMap.

The only way I can get it to work is by using a stand alone Python script - guess I will have to brush up on the python skills and rebuild everything in Python!

MartynMcGuinness

I've had the same problem with the Dissolve Tool since moving to 10.1. I first noticed it 2 weeks ago in a model built in 10.0. After a bit of time spent looking for solutions I rebuilt the model in 10.1 and it seemed to solve it.

However the problem had recurred again today in another basic model and the rebuild option has not worked this time. After testing the tool inside and outside of models I have seen the multipart problem also occur when running outside of a model - but not every time, and am unable to reproduce the error consistently.

When trying to repeat the steps of the model with just the standalone GP tools the multipart feature worked one time, but then a while (after a few other select and dissolve tools) later failed to work on the same input with the same Environments?? (Image of GP results attached)
The only thing so far that I can see that may be consistent is the select tool? The multipart dissolve has worked when I put a definition query on the layer and then Dissolve, but fails to work if I use the Select tool to create an intermediate selection matching the definition query, and then dissolve. And then fails to work subsequently after the select has run? Not 100% sure on this but I will do some more testing over the weekend and see what more comes of it.

Hopefully we can resolve this issue soon as the dissolve tool is my most commonly used GP tool.

Dissolve_All GP events.jpg

MicheleH_DNReply

Ok - so I didn't subscribe to this thread so I didn't see that I was asked to post my model... sorry!!

I am still having this issue though so here is my model (I hope - not quite sure how to do this...) The dissolve that isn't working is in in the middle of the model after 'Layer - 19'

It sum's all the attributes correctly and it dissolves where block are adjacent - it just doesn't make multi-part polys where the blocks are not adjacent.

ProblemDissolve.zip

nancyvonmeyer

I am not able to get the dissolve geoprocessing to work in 10.1 and it worked just fine in 10.0, this is a fairly simple dissolve and not a large data set.

BenPlunkett

Okay, so I did some testing to try and figure out why and when this error is occurring.

I actually had some trouble getting the error to happen again. The models I have been testing only have the dissolve process without any dissolve field selected. I have found that the error only occurs when attempting to make multi-part features. The model will function as if the "Create multipart features" option is not selected. The result will dissolve all overlapping polygons, but each will be an individual feature instead of a singular multipart feature.

[ATTACH=CONFIG]23261[/ATTACH]

I tried the simple process in modelbuilder and a python script, attempting multipart and single feature outputs. The error occurred in both modelbuilder and python multipart outputs. However, the error only occurred when I had either several browser windows open (Chrome) or had any streaming video or audio at the time. I tried to run the dissolve outside of the model during similar browsing activity, and it worked perfectly. It even worked when I opened up 8 videos simultaneously.

I'm running Arc Desktop 10.2 SP1 on a Windows 7 - 32 bit, 4 GB RAM, Core 2 Duo E8400 3.0 GHz processor, which exceeds ESRI system requirements.

I hope this can help you at least duplicate the error I am having. Thanks for any help or information you can give me about the situation.

-Ben

MB_Dissolve_Multi.jpg

MelanieSummers

Hello,

I also was not able to reproduce the issue when running only the dissolve tool in ModelBuilder, if possible, could you please share your model, I'd like to see if there is a common element preventing the dissolve tool from creating multipart polygons.

Thanks,
Melanie S.

MicheleH_DNReply

Hi there, just asking the same question as the last person really - does anyone know if ESRI is working on this. I have the exact same problem and have done since moving to 10.1. Dissolve won't create a multi-part poly in model builder. I have to run my model up to the dissolve then manually go into the feature class and merge the polygons together then complete my model. Quite a pain.

I am running Windows 7, 10.1 sp 1, 32 bit as well. Be good to know if this will be fixed in the next release which I believe is in a couple of weeks?

KristenE

Has this issue been resolved? It looks like this person had the same issue- http://forums.arcgis.com/threads/69378-ArcGIS-10.1-Dissolve-multipart-features-not-working. I have 3 people in my office and we are all having the same problem. All working on Windows 7 (not Windows XP) 32-bit machines. Dissolve tool worked fine in 10.0 and after the upgrade it does not dissolve multipart features.

DanielHofer

Same problem here.

BenPlunkett

I am having the same trouble with the dissolve tool in 10.1 not creating multipart polygons. I have three separate polygons that I want to dissolve into one multipart feature. The only way that I can get the dissolve tool to operate correctly is when using the Dissolve tool outside of model builder while not in an edit session.

The dissolve tool will not create multipart polygons in model builder whether I am in an edit session or not. It also fails to create multipart polygons when using the dissolve tool outside of model builder when I am in an edit session.

My colleagues are experiencing the problem. We all upgraded to 10.1 this week and are now experiencing this problem for the first time.

KenHartling

I'm unable to reproduce the problem. Please double check to make sure you are using the exact same parameters when running dissolve inside and outside of model builder.
If you are confident that you are, please contact support to see if they are able to figure out what is going on.
Thanks,
Ken
Senior GP Product Engineer

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