Update
A detailed description on using AstroDrizzle to create mosaics is available at the Archive website. It is a cookbook on how the Horsehead Nebula image was created by Jennifer Mack.
| Title | Goal | Data Description | DrizzlePac Tasks |
|---|---|---|---|
| WFC3/UVIS: Optimizing Image Alignment for Multiple Visits | Align and combine three images taken at different visits and orientations. | Three full-frame UVIS F606W images of Omega Centauri, each with exposure time of 40 sec., each taken in a different visit with different roll angle and offset. | Tweakreg AstroDrizzle |
| WFC3/IR: Optimizing Image Sampling for a Single Visit | Optimize image sampling using final_pixfrac and final_scale settings in astrodrizzle, for WFC3/IR images. | Spiral galaxy NGC 3370 in F160W, observed with a WFC3-IR-DITHERBOX-MIN pattern. All observations in the same visit with same orientation. | AstroDrizzle |
| ACS/WFC: Optimizing Image Alignment for Multiple Visits | Align and combine three images taken at different visits and orientations. | Three F606W images of the dense star field NGC 104, each with exposure time 339 sec.. The images are CTE-corrected flat field-calibrated files with suffix flc.fits. | Tweakreg AstroDrizzle |
| ACS/WFC: Optimizing Image Sampling for a Single Visit | Optimize image sampling using final_pixfrac and final_scale settings in astrodrizzle, for ACS/WFC images. | A two-point dither line with subpixel dithers at each point: four images of galaxy NGC 4449 taken with the F555W filter. The images are CTE-corrected flat field-calibrated files with suffix flc.fits. | AstroDrizzle |
| WFC3/UVIS: Aligning Images in Different Filters by Defining an Output Reference Frame | Two sets of drizzled images, each for a different filter, are aligned by WCS and in pixel space. | Observations of galaxy M83 in F814W and F438W, each filter set taken in different visits. There are three images per filter. | Tweakback Tweakreg AstroDrizzle |
| WFC3/UVIS: Alignment of Sparse Fields Using Headerlets | Use headerlets to align and combine three images with a high degree of precision. | Three full-frame 420-second UVIS F606W images of GRB-110328A observed in a 3-point dither pattern. | Tweakreg AstroDrizzle Apply_headerlet |
| WFPC2: Aligning and Drizzling WFPC2 Images | Strategies for dealing with severely undersampled WFPC2 images. | Six dithered images of Messier 2. Most objects are in the WF chips (plate scale 0.1"/pixel). | Tweakreg AstroDrizzle apply_headerlet_as_primary |
| SExtractor Catalogs to Align ACS/WFC Images | Using External SExtractor (v2.8.6) Catalogs from *_crclean.fits Images to Align ACS/WFC Images With Drizzlepac/Tweakreg | Alignment of four ACS/WFC images, about 60 pixels apart, using a catalog generated by SExtractor. The image contains a large number of extended sources, but relatively few point sources | TweakReg TweakBack AstroDrizzle SExtractor |
Some of these examples make use of configuration files (.cfg). A primer on working with configuration files can be found here.