Question

Creating polygons from points.

  • 19 March 2014
  • 5 replies
  • 186 views
S
Hello,

 

 

There is a point data, in which there are many which have identical concatenated attribute value. 

 

Trying to create a polygon of such points which have the identical attribute values and finding the centroid.

 

For which, the HullAccumulator (convex) was tried.

 

However, It does create the polygons but not in the cases where there are two points with identical attribute value it doesn't. requirement being, All the points which have these identical values need to create their respective polygon.

 

 

Regards.

5 replies

G
Badge +3
Hi,

 

 

I dont think areabuilder_type transformers can build a area or polygon from just 2 points....

 

 

 

2 points can form a line.

 

Maybe you could use a statisticscalculator to separate those and send them to a 2dPointreplacer/2DPointadder combo to build a line.

 

 

If u insist on forming an area from 2 points you can use a non-oriented boundingboxaccumulator.

 

(mind you, if the points lie on the vertical or horizontal, they will fail).

 

 

 

Gio

 

 

takashi
Rank
Userlevel 2
Badge +17
Hi Sani,

 

 

If your final goal is to find centroid (center of mass) of points which have identical attribute value, I think the Aggregator and the CenterOfGravityReplacer can do that.

 

 

Takashi
S
Thank You for the reply :)

 

 

Regarding seperating only the 2 points having identical attributes,

 

How to go about that?

 

 

 

david_r
Rank
Userlevel 4
Hi,

 

 

there are many ways to find the number of points having identical attributes, but it generally involves using the Group By on the shared attributes.

 

 

One way could be to use the StatisticsCalculator (with a Group By), as suggested by Gio.

 

 

David
tim_wood
Rank
Badge +7

I've done this with LineCombiner, but my data is structured in such a way that it will come out of the Polygon port of LineCombiner i.e. the last vertexes has identical coordinates to the start vertex.

Reply


Community Stats

28,731
Posts
109,529
Replies
36,565
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.