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In 1994 the Numerical Algorithms Group (nag) took over the development, porting, marketing, sales and support. iris Explorer runs on Linux, Unix and Windows platforms. Just like avs, it is an extendable but expensive system that lacks support for Python. (IEC - Iris Explorer Center) Figure 20 shows a screenshot from an iris Explorer project. 47 of 76 Figure 20. IRIS Explorer user interface. IDL, The Interactive Data Language idl is another system whose main difference from the two described above is that more of the development is textual programming, using a special high-level scripting language.

This is done by casting an imaginary ray from each pixel into the data volume. Samples are taken (at regular intervals) along the ray. The contributions from the samples are weighted together, possibly taking transparency, colour and distance to the image plane into account, into a value that is stored in the pixel from which the ray originates. 38 of 76 Figure 17. Image-order volume rendering (inverse mapping). The image plane is transformed and mapped onto the volume. Binary ray casting One of the first image-order volume rendering techniques, called binary ray casting1, was developed on a machine with only 32 kilobytes of ram.

The output from a cappi algorithm is a 2D image that is parallel to the surface of the earth; this image has been generated from an input polar volume. In Figure 7, a radar is shown with four of its elevation angles. When a cappi image is generated, the samples closest to the chosen altitude are projected down onto the output image plane, typically using nearest neighbour or bilinear interpolation. 22 of 76 At lower altitudes, there is data only in the region closest to the centre of the output image (which is straight above the radar), whereas at higher altitudes, there is no data available at the centre of the output image.

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3D visualization of weather radar data by Ernvik, Aron

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