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258 Chapter 12: Working with Contours Figure 12-1: Earth Convection Contours in the iContour Tool Note The examples/data directory of your IDL 7.0 distribution contains a text file named index.txt. This file lists all data files available in the example directory and also lists their dimensions and values. Displaying Irregular-grid Data Irregular-grid data points are presented by three one-dimensional vectors, usually known as fields. The following example shows one way of importing and displaying this type of data into the iContour tool. The three fields contained within the irreg_grid1.txt ASCII file in the examples/data directory is imported into IDL with the File → Open option in the iContour tool. This option uses the ASCII Template wizard to import the data, which is then gridded into contour data with the Gridding Wizard. The iContour tool then displays this data as contours. Displaying Contours iTool User’s Guide
