From Loading Data to Images

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1.6 From Loading Data to Images

The subsections below provide a brief overview of the steps you will need to load data into CASA and obtain a final, calibrated image. Each subject is covered in more detail in Chapters 2 through 6.

An end-to-end workflow diagram for CASA data reduction for interferometry data is shown in Figure 1.8. This might help you chart your course through the package. In the following sub-sections, we will chart a rough course through this process, with the later chapters filling in the individual boxes.

Figure 1.8: Flow chart of the data processing operations that a general user will carry out in an end-to-end CASA reduction session.

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Note that single-dish data reduction (for example with the ALMA single-dish system) follows a similar course. This is detailed in Chapter 8.

  1.6.1 Loading Data into CASA
   1.6.1.1 VLA: Filling data from VLA archive format
   1.6.1.2 Filling data from UVFITS format
   1.6.1.3 Loading FITS images
   1.6.1.4 Concatenation of multiple MS
  1.6.2 Data Examination, Editing, and Flagging
   1.6.2.1 Interactive X-Y Plotting and Flagging
   1.6.2.2 Flag the Data Non-interactively
   1.6.2.3 Viewing and Flagging the MS
  1.6.3 Calibration
   1.6.3.1 Prior Calibration
   1.6.3.2 Bandpass Calibration
   1.6.3.3 Gain Calibration
   1.6.3.4 Polarization Calibration
   1.6.3.5 Examining Calibration Solutions
   1.6.3.6 Bootstrapping Flux Calibration
   1.6.3.7 Correcting the Data
   1.6.3.8 Splitting the Data
   1.6.3.9 UV Continuum subtraction
   1.6.3.10 Transforming the Data to a new frame
  1.6.4 Synthesis Imaging
   1.6.4.1 Cleaning a single-field image or a mosaic
   1.6.4.2 Feathering in a Single-Dish image
  1.6.5 Self Calibration
  1.6.6 Data and Image Analysis
   1.6.6.1 What’s in an image?
   1.6.6.2 Image statistics
   1.6.6.3 Image values
   1.6.6.4 Moments of an image cube
   1.6.6.5 Image math
   1.6.6.6 Regridding an Image
   1.6.6.7 Displaying Images
  1.6.7 Getting data and images out of CASA

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