Computes more accurate shifts using cross-correlation and the initial shift values. Drizzles the data onto a new grid whose shape is user-specified. There is currently no cosmic-ray rejection. Results On the right is a simulated pipeline coadd of 40 data frames at 12um. In reality the drop size must be made still larger in order to ensure a sufficiently high amount of data coverage.
Similar arguments hold for the reconstructed pixel size.
Smaller drops may be used in the future with different dither patterns or more frames. Results have not been as encouraging as I had hoped. The mottled appearance of the background is a result of the actual noise being related to the spatial sampling of the dithered frames and the noise in the original pixels, which are now mostly decoupled from the physical pixels in the regridded image. The interpolation and large pixels used by the pipeline coadder smear this noise. However, the images do look quite a bit better, with less correlated noise in the drizzle image.