Overlay contours on a raster map

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7.3.3 Overlay contours on a raster map

Contours of either a second data set or the same data set can be used for comparison or to enhance visualization of the data. The Data Options Panel will have multiple tabs which allow adjusting each overlay individually (Note tabs along the top). Beware: it’s easy to forget which tab is active! Also note that axis labeling is controlled by the first-registered image overlay that has labeling turned on (whether raster or contour), so make label adjustments within that tab.

To add a Contour overlay, open the Load Data panel (Use the Data menu or click on the folder icon), select the data set and click on contour map. See Figure 7.11 for an example using NGC5921.

Figure 7.11: The Viewer Display Panel (left) and Data Display Options panel (right) after overlaying a Contour Map of velocity on a Raster Image of intensity. The image shown is for the moments of the NGC5921 cube, zoomed in using the tool bar icon. The tab for the contour plot is open in the Data Display Options panel.

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