Sunday, August 11, 2013

Comparing Helioviewer to JHelioviewer

Comparing Helioviewer to JHelioviewer

We tried racing to see whether Helioviewer or Jhelioviewer is better.
They each have their pros and cons. Helioviewer is faster by far! Usually the problem with delay is if it's some great event it gets back logged. Jhelioviewer is much faster to get a motion glimpse of the scene but it takes some time to export the video and then you have to upload it to YouTube (or other video service) and fill in the description and tags etc and wait again. The helioviewer upload to YT option is click it and forget it. You can even give it a nice name.


You might still want to add some more tags but it's efficient. If you are going to edit several clips together. In Movie Maker or another software editing program and add music it is always better than YT editor because the YT music is non-commercial. You do have to make sure you have your licenses for the Music.



The real differences are in the quality.

Above is a quick little video from Helioviewer with parameters 3 hours and time selected as 30 sec.



Below is the same time frame by Jhelioviewer which happened to have a glitch which does tend to happen a lot but not always. The layer is loaded by a date and time range and cadence. The cadence is a term that means how many images per something like 1 per minute or one every 5 minutes or one every 12 or 30 minutes. With Helioviewer the cadence is selected for you and depends on time frame. There is a limit with Jhelioviewer on the number per load but it will adjust it automatically if it exceeds the limit. The frame rate selected was 24 and  The version that I have is a beta version that includes a 3D application that still has a lot of bugs, but it so awesome to look at I have faith that it will all get fixed eventually.



You can see right away there is a difference in aspect ratio. With helioviewer you have to guestimate the aspect ratio you can do full frame to your computer screen but if your computer screen is not a perfect aspect ratio then it's a guess. With Jhelioviewer you can enter any aspect ratio you desire. The HD quality is available on both as long as your computer screen is HD.


Jhelioviewer gives you the option to sharpen the images and to select from a variety of options to adjust the color. These same color options may also be available in your video editing software color changes are now available in the YouTube editing ap so even if you decide at some future date to play with the color you can. This particular Jhelioviewer video has a bug , this is a good time to mention the J in Jhelioviewer stands for Java. If you happen to be very skilled in Java programming Jhelioviewer.org would love your assistance. When there are no bugs it is delightful!

Example of the embedded time in Jhelioviewer

Helioviewer has way more telescopes available to use even though the data form most of them is delayed by days and sometimes weeks. JHelioviewer only has SDO and SOHO images, at least with the version I have which is. 2.2.1.511 They said they would be rolling out a new version in several months several months ago. I can't wait! If you know how to add the revisions you can but I don't know how to do that... yet.


Helioviewer just recently added new features with the HEC (Heliophysics Event Registry) data and a Earth to scale that you can toggle off. Helioviewer has the date and logo present on all videos and images Jhelioviewer gives you the option to have the dates and times as a soft embed that you can turn on or off although how you turn them on I don't know or you can expert with the time hard embedded meaning it shows up in the video. The HEC data was available in the previous version of Jheliowiewer but not in the one that I have now.

Look for a tutorial on how to use each of these awesome programs soon.





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Data Sources

http://jhelioviewer.org/
http://helioviewer.org/
http://sdo.gsfc.nasa.gov/data/