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Question

Search Envelope of a reader : values as parameters from another reader

  • June 14, 2013
  • 2 replies
  • 85 views
S
Hi !

 

 

I have a reader on my FME Desktop 2013 workbench which opens data from an Oracle spatial database.

 

 

Reading the data take a long time, since it is a huge dataset.

 

 

The first step of my process is to use a SpatialFilter in order to select the features of my dataset which are included in a relative narrow region.

 

 

This means that I opend a lot of data that are not used in my process.

 

 

In order to avoid this, I can specify a Search Envelope in the parameters of the Reader. I guess that by doing this I only open the feartures that are within this envelope.

 

 

My question :

 

 

In the Search Envelope, I have to manually define the Min X, Min Y, Max X, Max Y values. Is it possible to derive these values automatically from another dataset ?

 

 

My idea is to add another reader on my workbench to open the delimitations of all the municipalities, to "TestFilter" this data in order to select only the municipality I need, to derive the Min X, Min Y, Max X, Max Y values of this municipality, and finally to use these values as a input parameters of the Search Envelope of the reader from which I need the data.

 

 

Thanks !
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2 replies

david_r
Celebrity
  • david_rCelebrity
  • June 14, 2013
Hi,

 

 

you can publish the Search Envelope parameters by right-clicking them. You can then create a second workspace that reads your bounding feature and passes the search envelope to the first workspace using a WorkspaceRunner.

 

 

Alternatively, look into replacing the Oracle reader with a Feature reader.

 

 

David
fmelizard
Safer
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  • fmelizardSafer
  • Safer
  • June 14, 2013
Hi,

 

 

It this case a Feature Reader is the best option.

 

You can read the municipalities feature(s), pass via a tester to select your feature of choice (for example municipality name). Edit/create a published parameter, import the municipality names from the feature(s).

 

Now you can use the parameter in the tester, to select you feature of choice when prompting.

 

Connect that to a Feature Reader and configure it intersect (or a spatial test of your choice).

 

Hope this helps

 

 

Itay 

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