Raster Interpolation is a QGIS plugin to interpolates values on raster layers.
It browses a vector layer of points, interpolates at their position the value of a raster layer and save the value in a chosen field of the vector layer.
Interpolation can be nearest, linear or bi-cubic. Simple filter on the vector layer may be applied (browse only currently NULL values and/or only selected features).
It can be used to calculate elevation from a DTM.
*scipy is required