3.6 Viewing spectra
3.6 Viewing spectra
The ImageCube view is specially designed for viewing spectra like those from the MER Mini-Thermal Emission Spectrometer (Mini-TES). These spectra can have hundreds of bands of information. To quickly scan through the spectral bands for information of interest, you can drag the Index slider from left to right to show different images in the imagecube.
As you move the index slider through the bands of the image, the image plane slides through the imagecube with it. The current band of the image is displayed above the slider at all times. There is a legend to the left of the imagecube to display the mapping of pixel values to brightness. The brightness range is always set from the minimum and maximum pixel value in the imagecube.
You can rotate the imagecube horizontally and vertically with the X rotation and Y rotation sliders located above the imagecube. As you rotate, the coordinate axis to the right of the imagecube helps keep you oriented. On the coordinate axes, AZ points along azimuth (west to east), EL points along elevation (low to high), and WL points along increasing wavelength.
You can also change the orientation of the plane in the imagecube with the
following options:
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| Azimuth-Elevation: The image plane shows a single wavelength over a range of azimuth and elevation. |
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| Wavelength-Azimuth: The image plane shows all wavelengths over a single elevation. |
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| Wavelength-Elevation: The image plane shows all wavelengths over a single azimuth. |
These options are located on the Action menu and the toolbar.
3.6.1 Spectra in Image view
You can also view an Mini-TES imagecube in the Image view (right-click on the imagecube in the Downlink selection tree and select “Open in ImageView”.) You can apply all of the image filtering, stretching, and coregistration overlay features in the Image view to an imagecube. However, the Image view doesn’t provide the wavelength slider or the Spectrum plot feature (discussed in the following section).