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Question

grid corner attributes

J
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Hello everyone,

 

 

I have a set of polygons that I would like to chop into a grid, create points on each corner, and create an id for each point starting from the southwest corner of each 12x12 area. Each polygon gets divided into a 12 x 12 grid and the corner points of the grid would be something like PolygonA_0,0 at the southwest corner 0,2 0,2...0,12 all the way up to PolygonA_12,12 in the northeast corner. This would be the same for each larger polygon. It woul be just like a point grid created by the 2dGridCreator.

 

 

So far I've use the Tiler to divide the polygons into the 12x12 grid and a TopologyBuilder to get the nodes, but I am a little stumped on how to get the IDs for the nodes.

 

 

Does anyone have an idea on how to get these iIDs populated?

 

 

Thank You

 

Justin

8 replies

takashi
Evangelist
  • takashiEvangelist
  • August 7, 2014
Hi Justin,

 

 

This workflow might help you.

 

 

 

Then, you can create required attribute based on "_column" and "_row".

 

Hope this helps.

 

 

Takashi
gio
Contributor
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  • gioContributor
  • Contributor
  • August 7, 2014
You can redirect the extracted nodes and gridlines to antother topologybuilder
gio
Contributor
Forum|alt.badge.img+15
  • gioContributor
  • Contributor
  • August 8, 2014
actually it is even easier if u just

 

 use 2 gridcreators or accumulators. One creates grid of points, the other polygons.

 

With same settings ther row/column values match.

 

Soutwest would have start (_xmin,_ymax) from the total BoundsExtracted.
takashi
Evangelist
  • takashiEvangelist
  • August 8, 2014
I'm afraid that you might miss how to get the points on north/east edges of the bounding box. The red points in this image.

 

 

gio
Contributor
Forum|alt.badge.img+15
  • gioContributor
  • Contributor
  • August 8, 2014
not realy, u just have to take into acount that u need a +1 on column and row.
gio
Contributor
Forum|alt.badge.img+15
  • gioContributor
  • Contributor
  • August 8, 2014
To illustrate this...

 

 

 

 

 

adn for a 2DGridAccumulator..

 

 

 

 

 

 

still hav'nt got rid of top row...
J
Forum|alt.badge.img
  • justinv
  • Author
  • August 8, 2014
I was able to get results using your workflow Takashi. This creates the points with IDs that closely match the tiled polygon. They don't match exactly because they were created with a bounding box. I then use the AnchoredSnapper to get them to the correct position. It isn't ideal since it relies on snapping but it seems to work.

 

 

Gio I haven't yet had time to fully explore your solution. What I am trying to do is divide up townships into quarter sections and give the corners ID's so I have to cut up an existing polygon. I'll have to see if I can get this to work with your suggestion.

 

 

Thank you both for your help,

 

Justin
gio
Contributor
Forum|alt.badge.img+15
  • gioContributor
  • Contributor
  • August 11, 2014
Thats what my solutions do.

 

Zoom in to see settings.

 

I set it up in 5-10 mins both versions.

 

 

You dont have to cut polygon up if u don't want/need to, to create the grid and its cornerpoints.

 

 

My example uses a neighbooorhood, called a "buurt" in Dutch btw.

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