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Table of Contents

You can see what options are available to you by clicking on the Graph button in Figure 3.

Figure 10 Graphing Options

Keep in mind that some of these options are available only for the cartesian graph for the data set ex2_1.sds.

Contour

A contour plot contains contour lines between areas of differing contour levels. A contour level is a range of data values that you want to distinguish from other ranges of values. For the example program given in the introduction, you will want the graphing options box to have the Plot Cartesian option showing. Clicking on the Contour button calls up the contour specifications window. Here you may specify the number and spacing of contour levels as well as the range of data values to be distinguished. Choosing the Number of Levels to be 57, the Min Value to be -350, and the Max Value to be 350, you should something similar to Figure 11.

Figure 11 Contour Mapping

Shade

A shaded data plot represents data values as eight different intensities of shading. This option will work for either the cartesian graph or the polar graph. The new window, Figure 12, is a black and white representation of your color raster maps.

Figure 12 Shading of Cartesian and Polar Graphs

Histogram

This will work for the cartesian graphs or the polar graphs, but not at the same time. First, click on the Display Cartesian option of Figure 3. Now that you have the cartesian window open, with the desired palette, click on the Select Point option until it changes to Select Area. Use the left button of the mouse to `rubberband' the desired area of the graph you wish to see represented in the histogram (this is done by clicking on the left mouse button and holding it while you move it in a diagonal direction, then letting the button go once you have the boxed in the area you want). You can also view the histogram without rubberband boxing any area at all. X Image will assume you mean to have the whole graph represented. This is what will happen if you choose the Plot Polar option. Since there is no way to specify a certain region of the polar graph, the histogram represents the entire graph. Figure 13 shows an example of a histogram, along with the corresponding cartesian graph.

Figure 13 Histogram and Corresponding Cartesian Graph

Profile

The profile option plots the frequency of data values as a height. To create the profile, you must first have the cartesian graph window open. In the upper left hand corner of the cartesian graph window, click on the toggle until it gives you the Select Line option. Then move the mouse into the graph, and click with the left mouse button where you wish the line to begin, and hold the button down while you move the mouse to the end of your line. One that is done, you should be able to see the line in the cartesian graph. Now go back to the graphing options window, and click on Profile for a window similar to Figure 14.

Figure 14 Profile Graph