DrizzlePac Archival Examples
| PDF File | Title | Goal | Data Description | DrizzlePac Tasks |
|---|---|---|---|---|
| Example 1 | 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 |
| Example 2 | 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 were obtained in the same visit with same orientation. | AstroDrizzle |
| Example 3 | 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 calibrated files with suffix *_flc.fits. | TweakReg AstroDrizzle |
| Example 4 | ACS/WFC: Optimizing Image Sampling for a Single Visit | Optimize image sampling using final_pixfrac and final_scale settings in astrodrizzle, for ACS/WFC imges. | A two-point dither line with sub-pixel dithers at each point: four images of galaxy NGC 4449 taken with the F555W filter. The images are CTE-corrected calibrated files with suffix *_flc.fits. | AstroDrizzle |
| Example 5 | 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 |
| Example 6 | 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 |
| Example 7 | 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 |
| Example 8 | Using SExtractor Catalogs to Align ACS/WFC Images | Use External SExtractor (v2.8.6) Catalogs from *_crclean.fits Images to Align ACS/WFC Images with 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).
View a primer on working with configuration files.