Area on Area overlay not working as expected

boubcher wrote:

any suggestion how could calculate the overlapping area and preserve the original attributes?

You can use the AreaCalculator (or the @Area function) to calculate the overlapping area after the AreaOnAreaOverlayer.

 

How do you define "original" area from which you need to preserve attributes if the resulting area has been generated from two or more overlapping areas? For example, the second right area has been generated from three overlapping areas. Which one of three is the "original" area?

 

@takashi

 

@takashihow about to calculate the area by subtracting the previous one ( overlaparea=arae of layerid 1509 - area of layer id 1510..etc ) the problem is how we apply that

boubcher wrote:

@takashi

Any sugestiion on how we could claculate the overlaping area and keep the same attibutes

See my comment to your previous post.

 

 

boubcher wrote:

any suggestion how could calculate the overlapping area and preserve the original attributes?

It's necessary to clarify the criteria regarding how to select an original polygon whose attributes should be preserved when the resulting area has been generated from two or more overlapping original polygons. For example, if you want to preserve attributes of the smallest one among overlapping original polygons, this workflow would be a possible way. Different criteria requires different solution.

 

 

 

 

takashi wrote:

It's necessary to clarify the criteria regarding how to select an original polygon whose attributes should be preserved when the resulting area has been generated from two or more overlapping original polygons. For example, if you want to preserve attributes of the smallest one among overlapping original polygons, this workflow would be a possible way. Different criteria requires different solution.

 

 

 

 

@takashi

 

 

I did follow the workspace suggested but I am getting a weird geometry I did

 

I use the Projected coordinate in order to have an accurate area calculation

 

Alos attached the workspace, in this, we Know the layer ID 1509 has always the smallest area

 

Thanks in advance

 

areaonareaoverlay-ouput.png

 

areaon-area-overlay.fmwt

 

 

 

boubcher wrote:

@takashi

 

 

I did follow the workspace suggested but I am getting a weird geometry I did

 

I use the Projected coordinate in order to have an accurate area calculation

 

Alos attached the workspace, in this, we Know the layer ID 1509 has always the smallest area

 

Thanks in advance

 

areaonareaoverlay-ouput.png

 

areaon-area-overlay.fmwt

 

 

 

Possibly the Tolerance parameter in the AreaOnAreaOverlayer could be leveraged to resolve the tiny gap between overlapping boundaries, if such a gap was the issue.