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Filter out or delete list values

S
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Hi,

I have a polygon layer with x,y,z coordinates.

For each polygon, I would like to calculate the mean z-value. For this I use the ListStatisticsCalculator, which works perfectly.

The problem is, that some polygons consists of one or more useless z-value (-999, -9999 etc.). I would like to filter out these values (or delete them) before running it through the ListStatisticsCalculator.

I have tried the ListElementFilter with Filter Type Numeric Range, but I can't get it to work properly.

Any thoughts?

Thanks,

Stig

Best answer by david_r

How have you configured the ListElementFilter? This example works for me, removing all list values outside the range 0-99. Notice the paranthesis around the match expression, otherwise it won't work as expected:

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4 replies

redgeographics
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The easiest and most elegant way (in terms of Best Practices) would be to remove those values before building the list. A Tester or TestFilter can be used for that.

david_r
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  • david_rEvangelist
  • Best Answer
  • May 2, 2018

How have you configured the ListElementFilter? This example works for me, removing all list values outside the range 0-99. Notice the paranthesis around the match expression, otherwise it won't work as expected:

S
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  • stihe
  • Author
  • May 2, 2018
redgeographics wrote:

The easiest and most elegant way (in terms of Best Practices) would be to remove those values before building the list. A Tester or TestFilter can be used for that.

Wouldn't I need to extract the coordinates before doing that? The way I do it now, is to create lists with all coordinates in the CoordinateExtractor.

 

How do I remove z-values with the Tester, if there is no attribute containing all z-values?

 

 

S
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  • stihe
  • Author
  • May 2, 2018
david_r wrote:

How have you configured the ListElementFilter? This example works for me, removing all list values outside the range 0-99. Notice the paranthesis around the match expression, otherwise it won't work as expected:

I thought I had configured it the right way, but I forgot the parenthesis. Doh!

 

 

I works perfectly now. Thanks.

 

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