Added functionality to rasterio.sample function: sampling with interpolation using scipy.interpolate.interp2d
https://github.com/rasterio/rasterio/blob/master/rasterio/sample.py#L3 https://docs.scipy.org/doc/scipy/reference/generated/scipy.interpolate.interp2d.html rasterio/rasterio#382
could make smaller dependency using https://github.com/JohannesBuchner/regulargrid