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An example for visualization presentation changes based on a collaborative
circular tabletop environment has been presented in [94]. The presentation of
the circular node-link tree layout was modified to rotate all nodes towards the
boundary and a “magnet” was implemented to rotate nodes towards just one
team member. Nodes were also changed in size; as leaf nodes were placed closer
towards team members, in their personal space [81], they were decreased in size
and the nodes towards the center of the table were enlarged to allow for easier
shared analysis of the node contents in the group space [81]. A possible extension
of this work is to think about placing and re-arranging nodes automatically
based on the placement and discovery interests of team members or based on
the individual or shared discoveries that have been made.
The presentation of visualizations might also have to take available input
devices on a shared large display into account. If fingers or pens are used as
an input device, the selection might not be accurate enough to select small
information items. A common task in information visualization is to re-arrange
data items (e. g. by placing points of interest), to request meta-information [85]
(e. g. by selecting an item), or to change display parameters by selecting an
item. If the displayed dataset is large, it often covers the full screen and reduces
individual items to a few pixels. Previous research has attempted to solve the
issue of precise input for multi-touch screens (e. g. [8]) but they might not be
applicable if the whole visual display is covered with items that can possibly
be selected. Alternatively, information presentations could be changed to allow
for easier re-arrangement and selection of items, for example, with lenses [20].
DTLens [35] presents an initial exploration of the use of lenses in co-located
collaboration.
The resolution of a large display has an influence on the legibility of data
items. It is known that the reading of certain visual variables is dependent on the
size and resolution in which they are displayed [99]. Information visualizations
also often rely on textual labels to identify data items which may be hard to
read on low-resolution displays. The presentation size of individual items and
labels may have to be adapted to compensate for display resolution.
View Issues:
The term view is common in information visualization literature
and view operations (changing what one currently sees) have been defined as
distinct from value operations (changing the underlying data) [23], however, this
use of the term view also incorporated changes in visual aspects of representation,
presentation. Blurring the distinction between view and presentation changes has
not been problematic because with a single viewer and a single display these are
often concurrent. A change in view can be simply looking at exactly the same
presentation and representation of the same data merely from a different angle
or it can include changes in all three factors.
In a co-located collaborative setting, of necessity there are as many views
of a given presentation as there are people in the group. Also since collabora-
tion practices often include mobility, a given person's view will change as they
move in the physical setup. This factor has recently begun to receive attention
in the CSCW community. Nacenta et al. [66] have shown that righting (orient-
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