Viewing a raster map

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7.3.1 Viewing a raster map

A raster map of an image shows pixel intensities in a two-dimensional cross-section of gridded data with colors selected from a finite set of (normally) smooth and continuous colors, i.e., a colormap.

Starting the casaviewer with an image as a raster map will look something like the example in Figure 7.1.

You will see the GUI which consists of two main windows, entitled ”Viewer Display Panel” and ”Load Data”. In the ”Load Data” panel, you will see all of the viewable files in the current working directory along with their type (Image, Measurement Set, etc). After selecting a file, you are presented with the available display types (raster, contour, vector, marker) for these data. Clicking on the button raster image will create a display Fig. 7.1.

The data display can be adjusted by the user as needed. This is done through the Data Display Options panel. This window appears when you choose the Data:Adjust menu or use the wrench icon from the Main Toolbar. This also comes up by default along with the Viewer Display Panel when the data is loaded.

The Data Display Options window is shown in the right panel of Figure 7.1. It consists of a tab for each image or MS loaded, under which are a cascading series of expandable categories. For an image, these are:

display axes
hidden axes
basic settings
position tracking
axis labels
axis label properties
beam ellipse
color wedge

The basic settings category is expanded by default. To expand a category to show its options, click on it with the left mouse button.

   7.3.1.1 Raster image — display axes
   7.3.1.2 Raster image — basic settings
   7.3.1.3 Raster image — other settings

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