Maximum number/height of tracks?

[Alex Reynolds]

Dear UCSC Genome Browser team.

I was wondering if there are upper limits on the number of tracks and/or total track height that can be rendered in a browser window?

For instance, we have ~800 bigWigs and we want to render them in 150-base wide window, say, to draw a long vertical strip.

Thanks,

Alex

[Christopher Lee]

Hi Alex,

Thank you for your question about the maximum number of tracks that can be displayed in a single window. Although there is no theoretical limit to the number of tracks that can be on in a current window, the browser will only draw a maximum height of 32,000 pixels.

You may be interested in a multiWig container:
http://genome.ucsc.edu/goldenPath/help/trackDb/trackDbHub.html#aggregate

where each bigWig subtrack will be stacked on top of the other subtracks in the same track group. An example of this style of bigWig track is the Layered H3K27Ac track for the hg38 browser:
http://genome.ucsc.edu/cgi-bin/hgTracks?hgS_doOtherUser=submit&hgS_otherUserName=chmalee&hgS_otherUserSessionName=hg38_example_multiWig

I hope this is helpful, please let us know if you have any further questions!

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.

Christopher Lee
UCSC Genomics Institute

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