QGis: Roughness map for an area larger than "Get WorldCover landcover polygons" tool limit

[Wesley Vidal]

Hello, I am currently trying to use the 'DTU Wind' tool for QGIS to create a roughness map for an area larger than 60 x 60 km, which is the area limit for the "Get WorldCover landcover polygons" tool.

Is there a way to divide a larger area into sub-areas and merge the .map files?

[Rogier]

There is ways to do that, but I guess the first question is whether you really need a map this big? Usually a distance of about 20 km from yours turbines/mast is more than enough and anything more will not have a significant effect on the flow modelling results, but will make the computations significantly slower.

[Wesley Vidal]

Yes, in Brazil we sometimes need to.
It's an unusual situation, but in some projects we have very large areas available for projects.
I've even tried joining two shapefiles downloaded via wordcover, but they don't fit together perfectly