Question

HotPots/ Density anlaysis based on polygons

  • 28 November 2012
  • 3 replies
  • 3 views

Sort of following on from my previous question about Overlapping Polygons ....  (AreonAreaOverlayer)

 

 

I'm going to be wanting to look at ways of analysing the data based on the accumulated attributes of these polygons.

 

 

Each Polygon has an assigned Intensity Value. Where these polygons overlap then there will be an accumulated Intensity Value.

 

 

I'm wanting to represent these Intensity Values in some meaningful way, and thought that a Hotspot/ Density analysis might be a good way to do so.

 

That is, to create a cluster around areas of a similar intensity valueand have a gradient/ contour map showing these Intensities.

 

 

There seem to be some transformers which would work on point datasets, but can this be done on a polygonal dataset too ?.

 

Would using a Convex/ Concave Hull around polygons of a similar Intensity Value be a valid way of achieving this ?

 

 

Thanks in advance,

 

 

Bruce

3 replies

Userlevel 4
Badge +13
Hi Bruce,

 

 

Have alook here 

 

http://fmepedia.safe.com/articles/Samples_and_Demos/Calculate-Density-or-Cluster-Analysis-Modeling

 

 

Hope this might help.

 

 

Thanks Itay - I saw that, but does that work with Polygons as well ?

 

 

I've also seen Mark Ireland's Blog about the HullAccumulators too:

 

http://evangelism.safe.com/fmeevangelist105/

 

 

which looks good to me - just got to upgrade to Desktop 2012 !
Userlevel 4
Badge +13
Hi Bruce,

 

 

I wouldnt know, never tried it myself, just looked like what you might need....

 

Another approach could be to tranform the polygons into rasters and display them according to the intensity value....

 

 

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