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I need to delete all the vector 'part' that it's outside the yellow raster region.

How can I do it?

enter image description here

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Yellow = raster

Black = vector

1) Polygonize the raster: create a polygon of the yellow area (https://grass.osgeo.org/grass64/manuals/r.to.vect.html)

2) Clip the black vector with the yellow polygon (https://grass.osgeo.org/grass76/manuals/v.clip.html).

you don't erase the black vector, instead you extract the part you want to keep

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