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Re: Graphs and Alt Text

From: Madeleine Rothberg <madeleine_rothberg@wgbh.org>
Date: Fri, 16 Nov 2012 21:17:44 +0000
To: "w3c-wai-ig@w3.org" <w3c-wai-ig@w3.org>
Message-ID: <F40281431C2E4746837AD2D349E72F1113D1FE4B@WSMBX1.wgbh.org>
If the complete raw data can't be published, could an abstracted version
be used? When we write a description of a graph without access to the
original data, we pick some representative points and estimate the values
for those points by reading the graph in order to present a reasonable
overview of the data. It seems like a shame to water down the data when
the real thing is available, but it might be necessary in those cases.


On 11/16/12 4:05 PM, "Daman Wandke" <daman@damanw.com> wrote:

>Thanks for the quick responses.  I have one more sticky issue.   On some
>the graphs, we are not allowed to publish the raw data.  What should I do
>those situations?
>-----Original Message-----
>From: Patrick H. Lauke [mailto:redux@splintered.co.uk]
>Sent: Friday, November 16, 2012 12:58 PM
>To: w3c-wai-ig@w3.org
>Subject: Re: Graphs and Alt Text
>On 16/11/2012 20:47, Daman Wandke wrote:
>> I am trying to figure out the best way to write alt text for line
>> graphs.  I am wondering what techniques others have used.  Graphs are
>> used to represent data quickly, but they also contain a lot of data.
>> How do I balance the amount of information?  I also have to find a
>> technique that content editors can implement easily.  The only
>> technique I can think of is to include an accessible data table with the
>> data.
>> Looking forward to any input or suggestions.
>The traditional answer would indeed be to at least include the raw data
>in a
>correctly (with the right headers etc) marked up table. It would also be
>useful (for all users, including those that can see the graph
>itself) if there was a summary of what the graph was trying to illustrate,
>I'd say. A la "With the exception of Q1 2012, sales in the past year have
>been on a steady rise, closing at a total of $5bn, more than double the
>previous year's closing figure of $2.3bn" ... or something.
>Patrick H. Lauke
>re·dux (adj.): brought back; returned. used postpositively [latin : re-,
>+ dux, leader; see duke.]
>www.splintered.co.uk | www.photographia.co.uk http://redux.deviantart.com
>twitter: @patrick_h_lauke | skype: patrick_h_lauke
Received on Friday, 16 November 2012 21:19:39 UTC

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