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ICM stores everything, as coordinates in tables. This is especially an issue for polygons as polygons are just coordinates in a table. This means things like Donut polygons are not allowed and complex polygons produce countless annoying errors that need to be fixed. Donut polygons are important for things like representing buildings in the roughness layer etc. Please look into adding a proper GIS engine into the software.
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Thanks for the suggestion and thanks to those who voted.
I will move the status of this idea to "Gathering Support" and we will engage in consultations with a wider array of stakeholders to gauge their interest and gather additional perspectives on the proposed feature. Should we observe a substantial level of enthusiasm and demand, we will be inclined to advance the status of this suggestion to "Under Consideration." This stage will involve a more detailed analysis, including a feasibility study, resource allocation assessment, and preliminary planning to understand how Donut polygons could be integrated into ICM.