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Category Archives: visualization
Modifying the size and position of a plot
In IDL 8 (a.k.a. New) Graphics, you can interactively move and resize plots in a window. For example, make a test plot in red: IDL> p = plot([0,1], ‘r’) Select the plot by clicking the mouse in the interior of … Continue reading
Stern Special
A visualization from an article by the famous (infamous?!) Prof. Mike Brown of Caltech (@plutokiller) is featured on the cover of a recent issue of The Astronomical Journal: That’s IDL color table 15, Stern Special.
Solar wind visualization at NOAA SWPC
George Millward and his colleagues at the NOAA Space Weather Prediction Center (SWPC) use IDL, among other tools, to study, monitor and forecast solar events that impact GPS, power grids and communications networks on Earth. On the WSA-Enlil Solar Wind … Continue reading
Updated snow water equivalent map
Last January, I posted a link to the daily snow water equivalent (SWE) map created by Andrew Slater at NSIDC. He’s since updated his website to include maps of SNOTEL stations throughout the western U.S., as well as climatology plots … Continue reading
Posted in visualization
Tagged (New) Graphics, Direct Graphics, Linux, map projections, science!, web
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A visualization of polar winds
Earlier this fall, I worked with Hyungmin Lee (University of Colorado) on creating a visualization of polar wind data from the Goddard Earth Observing System Model, Version 5. Here’s the result: The top row depicts, in a polar stereographic projection, Northern … Continue reading
Calculating the period of the sunspot cycle
Two weeks ago, I used the sunspot number data provided by the Solar Physics Group at NASA’s Marshall Space Flight Center to demonstrate positioning plots in window. This week, I’d like to show how to calculate the period of the … Continue reading
Posted in data access, data analysis, visualization
Tagged (New) Graphics, FFT function, IDL 8, IDL 8.2.1, READCOL procedure, signal processing
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IDL generates 3D image of Hurricane Sandy
Owen Kelley, of NASA’s Goddard Space Flight Center and George Mason University (and featured here before), made this visualization of Hurricane Sandy using IDL: More information on how Dr. Kelley created this image can be found at: http://earthobservatory.nasa.gov/blogs/earthmatters/2012/10/29/a-view-of-sandy-from-the-trmm-satellite/. Dr. Kelley was … Continue reading
Positioning plots
Last week, I gave an example of creating a multi-panel plot (or multiplot) using the LAYOUT keyword. Today (with a nod to a comment from Paul Young), I’ll show an alternate technique using the POSITION keyword. The Solar Physics Group … Continue reading
Posted in data access, language, visualization
Tagged (New) Graphics, HISTOGRAM function, IDL 8, IDL 8.2.1, POSITION property, READCOL procedure
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Making a multi-panel plot
Multiple-panel plots (or small multiples, from Edward Tufte) group a set of plots for convenient comparison. In DG, multi-panel plots can be built with the !p.multi system variable, or the MULTIPLOT astrolib routine. I’d like to show how to make a multi-panel plot in NG. I coded … Continue reading
Posted in language, visualization
Tagged (New) Graphics, IDL 8, LAYOUT property, multi-panel plot, multiplot, small multiples
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Updates to the MAPGRID function
Prior to IDL 8.2, the labels used on the graticule produced by MAPGRID were hardcoded (e.g., 30oE or 15oS). Now, with the LABEL_FORMAT property, you can provide a callback function to create labels with custom formatting. Also, through the LATITUDES and … Continue reading
