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.