Dear Seung Kim,
Thank you for using the UCSC Genome Browser and your question about using bigBed data in the Browser.
Unlike the BED files that you have been successfully uploading to the Browser, bigBeds instead must reside at an internet accessible location, referring to the location as a "bigDataUrl" that is accessed by ftp/http.
How bigBeds work is that only small segments of the files are passed over the internet, so even if your bigBed is several gigabytes in size, only the small section you are currently visualizing in the Browser is sent over the internet.
To do these internet transfers of only small segments of the files, the location that is hosting the bigBed must allow byte range requests. Most free services like DropBox do not enable this kind of access, as it could also result in people hosting pirated video on their free servers.
A free science based file sharing service does exist called CyVerse, sort of like the DropBox of scientific data. By uploading your bigBeds to their file server, you can create "Send to Browser" or "View in Browser" links that allow the file to have byte-range requests enabled.
Please see this previously answered question about using CyVerse:
https://groups.google.com/a/soe.ucsc.edu/d/msg/genome/_Ws2jxNfJV4/0c5aGb_PAQAJOnce you have a file at CyVerse (or any location with byte-range access, your institution may provide a location as well), you can paste the URL to your track on the Custom Track page.
For example, here is a bigBed at our local server that could be pasted in:
http://genome.ucsc.edu/goldenPath/help/examples/bigBedExample.bbAnd here is the same file hosted at CyVerse:
http://de.cyverse.org/anon-files/iplant/home/brianlee/bigBedExample.bbPlease note you can add additional parameters to your custom track lines, such as defining a name beyond the file name, and giving a description and other attributes, see this link for more information:
http://genome.ucsc.edu/goldenPath/help/customTrack.html#TRACKtrack type=bigBed name="CV bigBed" description="A bigBed file at Cyverse" color=0,255,255 visibility=full bigDataUrl="http://de.cyverse.org/anon-files/iplant/home/brianlee/bigBedExample.bb"
Thank you again for your inquiry and using the UCSC Genome Browser. If you have any further questions, please reply to
gen...@soe.ucsc.edu. All messages sent to that address are archived on a publicly-accessible forum. If your question includes sensitive data, you may send it instead to
genom...@soe.ucsc.edu.
All the best,
Brian Lee
UCSC Genomics Institute
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