Skip to main content
Solved

Is it possible to remove list elements of a feature based on an arithmetic expression (without exploding the list)?

  • November 17, 2022
  • 3 replies
  • 149 views
N

I have roughly 12.000 features (points). Each feature has a list with 400 elements, which all have an X and Y attribute. I would like to remove the elements of which the distance between the point of the feature and the element attributes is bigger than a certain number.

 

Currently I'm first exploding the list, and then using a tester with the arithmetic expression(@sqrt(@pow(@XValue()-@Value(x_end),2) + @pow(@YValue()-@Value(y_end),2))).

 

The problem is that this way I first explode the list, which results in more than 4 million features! If I could eliminate them before exploding than I would only have roughly 200.000, which would improve performance.

 

 

Best answer by david_r

To me this would definitely be done in a PythonCaller. Exploding features is very costly (performance-wise), and reducing the list in Python would avoid that.

View original
Did this help you find an answer to your question?

3 replies

david_r
Celebrity
  • david_rCelebrity
  • Best Answer
  • November 17, 2022

To me this would definitely be done in a PythonCaller. Exploding features is very costly (performance-wise), and reducing the list in Python would avoid that.

ebygomm
Influencer
Forum|alt.badge.img+34
  • ebygommInfluencer
  • Influencer
  • November 17, 2022
david_r wrote:

To me this would definitely be done in a PythonCaller. Exploding features is very costly (performance-wise), and reducing the list in Python would avoid that.

Second that, my main driver for learning to use python in FME was to avoid exploding lists

M
Forum|alt.badge.img+2
  • markatsafe
  • November 17, 2022

@nibon​ it might be better to look at why you have ~400 elements in the list in the first place and try and reengineer that part of your workflow. Otherwise PythonCaller is probably your friend as @david_r​  suggests. Very simple example of Python lists and FME list attributes here (towards the end)

Reply


Helpful Members This Week

Community Stats

31,223
Posts
118,401
Replies
38,824
Members

Latest FME

Terms & ConditionsCookie settings

Cookie policy

We use cookies to enhance and personalize your experience. If you accept you agree to our full cookie policy. Learn more about our cookies.

 
Cookie settings
A product of
Safe Software respectfully acknowledges that we live, learn and work on the traditional and unceded territories of the Kwantlen, Katzie, and Semiahmoo First Nations.