Attribute polygons based on their location within a larger polygon

Hi,

 

 

An idea.

 

(1) Create 4 corner points for each large square.

 

- Extract extent (xmin, ymin, xmax, ymax) of the square by a BoundsExtractor.

 

- Branch the flow into 4 streams; add VertexCreators on each stream to create the corner points.

 

NW corner: (xmin, ymax)

 

NE corner: (xmax, ymax)

 

SW corner: (xmin, ymin)

 

SE corner: (xmax, ymin)

 

- Connect AttributeCreators to each VertexCreator to add an attribute which indicates one of the locations {NW, NE, SW, SE} to the point.

 

 

(2) Merge the location attribute to the one-quarter squares by a SpatialFilter

 

Corner points (from the 4 streams) => Filter

 

One-quarter square => Candidate

 

Group By: ID of the large sqaure  * important!

 

Tests to Perform: Touches

 

 

If you have to consider some tolerance between the corner point and the one-quarter square, you can also use a NeighborFinder instead of the SpatialFilter.

 

 

Takashi

Assuming the two sets are aligned.

 

 

Create ID for larger tiles if you don't have that yet.

 

Create a centerpoint for the larger Tiles.

 

Create centerpoints for smaller tiles.

 

 

Relate the smaller tiles to the larger tiles, overlayer/spatialRealtor/Clipper or wichever you prefer.

 

Merge the centerpoints of the large tiles to the smaller tiles grouped by the ID (wich you created earlier).

 

Calculate angle. Test for quadrant.

 

(if you don't want to do the math, just create lines form the centepoint of large tile to the smaller tiles and use the Azimutcalculator).

 

 

 

 

....come to think of it, why the hassle?...

 

Just use a tiler in iterative mode and set to 4 on the larger tiles.

 

This wil create the smaller tiles.

 

The row and column id basicaly gives away the quadrant: 0,0; 02;0,4 etc. are lower leftquadrants.

 

 

 

To use Tiler iteratively u need to set the paralellproces mode in the navigator.

 

 

There are a couple of examples of this in this former. Search for iterative tiling.

 

 

.....on the other hand....you can also do without iterative tiler, by using a tiler on the extent of the large tiles with double the rows and double they columns. Then relate the set of smaller tiles to it. Again row/columnnumbers give awa the quadrant.

 

 

 

 

 

Thanks everyone.

 

 

I ended up using Takashi's first method successfully :)

 

 

I couldn't work out how to use the "Iterative" tiler mode..