Question

Find gaps in polygon layer

  • 9 December 2017
  • 3 replies
  • 34 views
K
Badge +1

Hi,

I need to find the gaps between two polygons (not auto - correction). Kindly let me know which transformer I have to use?

Thanks in advance

Regards,

K.Jayakumar

3 replies

danilo_fme
Rank
Userlevel 4
Badge +30

Hi @kumarkannan1980,

You can see this solution in this case created here: Find gaps in Polygons

Thanks,

Danilo

K
Badge +1

Hi,

I tried "Dissolver" ,"AreatoAreaoverlayer" to find gaps between polygons . It fails in some situation. The result is inconsistent. I tried "AreaAmalagamator" it is working fine but it is taking more time even for less volume of data. Any other method/transformer to find the gaps.

I noticed that Dissolver some times failed to dissolve if the gap of the polygon is more.

erik_jan
Rank
Userlevel 2
Badge +16

Create a bounding box (Creator or BoundingBoxAccumulator) for the complete area.

Then feed both the polygons and the box to the AreaonAreaOverlayer.

Use the Tester to test if _overlaps = 1, those are locations without a polygon (gaps).

Reply


Community Stats

28,681
Posts
109,406
Replies
36,540
Members
Terms & ConditionsCookie 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.