closeRaster.py

import os
chemin='[% "location" %]'
nomCouche = str(os.path.splitext(os.path.split(chemin)[1])[0])
instRegistry = QgsMapLayerRegistry.instance()
couche = instRegistry.mapLayersByName(nomCouche)
if len(couche) > 0:
        instRegistry.removeMapLayer(couche[0].id())