Trees - Grouping two lists and organising them together

Grasshopper
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1

Hi,

I’m using Grasshopper on Rhino 8 and have not been able to solve my problem. I have a shapefile of the map of Paris. However, each district is subdivided into zones. Each zone has a specific code that connects it to its respective district. That is my list A. Then, I have a list of the population of each zone. That is my list B.

What I want to do, is organise list A into its respective districts (which i did with create set) – and then sum up each population/zone into the respective districts too!

However, I cannot find a way to make this work. I tried with Split List, Sort list, and a bunch of things but I cannot get it right.

So far, both lists have been flattened.

Thank you !!

2

a .*gh eith internalized data would be helpful.

3

GH_FORUM_TREE_DATA.gh (20.8 KB)

Here’s the file!
IRISc_cain is list A

IRISm2_pop is list B.

I ended up creating a reworked shapefile from QGIS to make it work. But there must be a way to do it all on grasshopper. Internalised file is the one I was stuck with.

4

This uses some plugins I don’t have. Can you put Data components on these wires and internalise the inputs so we don’t depend on the plugins?

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image1068×790 60.6 KB

5

Heya, it might also help to upload the .SHP file with the GIS data if you want others to provide filtering logics specific to the data set you need.

I haven’t used the Urbano plugin for this, but @Brian_Washburn’s Heron does wonders when it comes to handling GIS data within Rhino/GH, highly recommend it.