Question

Group by in a Custom transformer with Spatial Filter

  • 13 February 2018
  • 2 replies
  • 2 views
V

I have created a linked custom transformer with a loop and a spatial filter. In this transformer I check if a line feature intersects with an area, but only if they belongs to the same group. So I thought I had to use the Group By parameter in the spatial filter.

The problem is that my custom transformer does not work with the Group By parameter. I mean, if I do not define a Group By some lines pass the test (but not belongs to the same group) but if a define the Group no line passes.

This is my first custom transformer, so, any suggestions would be appreciate

Thanks in advance

Víctor

2 replies

G
Badge +3

Should work.

Are you sure the groups are well defined and the relevant attribute propagated?

Also it is a blocking, so all the inputs are collected prior to filtering.

Maybe you want to iterate trough the groups (custom) and then feed the custom to filter them. (custom within a custom)

For instance If a line crosses trough more then 1 group ad intersects polygons in more than one of these groups, it will only get used once. Meaning that cloning the line or chopping it up is required..

V

Should work.

Are you sure the groups are well defined and the relevant attribute propagated?

Also it is a blocking, so all the inputs are collected prior to filtering.

Maybe you want to iterate trough the groups (custom) and then feed the custom to filter them. (custom within a custom)

For instance If a line crosses trough more then 1 group ad intersects polygons in more than one of these groups, it will only get used once. Meaning that cloning the line or chopping it up is required..

I found my mistake. I had a FeatureHolder just before the SpatialFilter and this was the problem. A newbie error...

 

Thanks a lot for the answer!

 

 

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