“One thing that changed early on that made a huge difference and made all this really possible is that we use this JPEG2000 technology,” Helioviewer Project co-founder Keith Hughitt explains. If you have ever downloaded or extracted a very large compressed image file, you understand the time saving that JPEG2000 offers. In other words, the system generates only the part of the image you really want to see. Also, JPEG2000 can extract sub-regions of the compressed image file without having to open the whole file. Then Helioviewer met JPEG2000, a standard for compressing images to make them extremely small while maintaining very good image quality. Each tile is a separate file, and they all have to be labeled, stored, and pulled from storage and assembled when needed. The trouble is, as you zoom in it requires an ever-increasing number of small tiles (numbering in the hundreds) to build the new image. The system retrieved the tiles it needed to build the view requested by the user with every click of the mouse. In the prototype of, each stage of a zoom-in required a complete set of tiles. “Google Maps was the original inspiration for it,” Helioviewer Project co-founder Jack Ireland says. The prototype of Helioviewer took this approach, too, following Google’s lead. Google Maps and Google Earth overcame this issue by “tiling” large images into a checkerboard of smaller segments that could be quickly assembled into an image at the scale a user requested. SDO sends down images that are 4,000 by 4,000 pixels, approximately the same number of pixels as in a 13 by 13 inch photographic print. This is particularly challenging when working with high-resolution images from NASA’s Solar Dynamics Observatory. The challenge was this: How do you acquire and manipulate solar images quickly enough so that the process is truly “real time,” without long waiting times for downloads and glacial refresh rates on the image view every time you make a change, like zooming in on a feature of interest? But there is also a critical data-processing “back end” that required just as much effort to develop. The Web app and the JHelioviewer software are the on-screen interfaces that users see. 12:49:11,867 DEBUG class -JPIPStream - Close successful.The Solar Dynamics Observatory beams data to Earth at a rate of 150 Mb per second. 12:49:11,838 TRACE class -JPIPStream - Closing 12:49:11,829 DEBUG class -JPIPLevel - Close successful. X11Util.Display: Shutdown (JVM shutdown: true, open (no close attempt): 1/1, reusable (open, marked uncloseable): 0, pending (open in creation order): 1) 12:49:11,796 TRACE class -JPIPLevel - Closing 12:48:03,180 ERROR root - GLInfo > Profile GL4bc is not available on X11GraphicsDevice]], but:, GLProfile, GLProfile, GLProfile, GLProfile, GLProfile, GLProfile, GLProfile, GLProfile, GLProfile] 12:48:02,036 INFO root - Start main window 12:48:01,397 DEBUG class -JPIPStream - Initialize successful. 12:48:01,272 TRACE class -JPIPStream - Initializing 12:48:01,244 DEBUG class -JPIPLevel - Initialize successful. 12:48:01,082 TRACE class -JPIPLevel - Initializing 12:48:00,526 INFO root - JHelioviewer started with command-line options: ![]() Here is the jhv-2.]$ java -jar JHelioviewer.jar How to proceed further to open the application? Then I ran the following command: java -jar JHelioviewer.jar I downloaded the software and extracted it from the its tar.gz file.
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