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New to the forum and FME really...
I did some searching around on here and couldn't find what I was looking for...
I have blockgroup level statistics and want to be able to perform proportional spatial overlay calculations to calculate polygon level statistics for custom polygons (radius,drivetime,etc.).The approach I am using,conceptually is....
Join the blockgroup boundaries to the blockgroup tabular data
Use AreaCalculator to generate the area of each BG
Use AreaCalculator to generate the area of the custom polygon
Use AreaOnAreaOverlayer to bring them together
That is where I get lost...
Ideally I would end up with a list of all the BGs that are within the polygon along with their percent intersect.From there I can apply the proportion to the BG statistic
Does anyone have an example 亚搏在线workflow that I could follow along with?I am used to using Alteryx for this kind of spatial work and haven't done anything this advanced in FME to date.
This is possible.
What you should do:
1) after the overlay,recalculate the area of each different part.
2) Based on the ID of each block,calculate the relative amount of a block that is inside your custom polygon.(Divide the new areas by the total initial area).
3) For each custom polygon,use these relative numbers to interpolate statistics from your blocks to your custom polygon.
Does that solve your question?
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