A new feature in Aladin version 10 is a direct access to a collection of over
20,000 data sets. All data sets published in the Virtual Observatory are now
available. These collections are presented as a tree in a panel located
to the left side of the main Aladin desktop window. You can click and drag
the side of this panel to resize it, and this tree is sorted by data
type categories: image, database, catalogues, cubes etc. And you can expand or collapse
the tree completely using the "+" button located at the lower left of the
panel like this. You can also click on individual nodes to expand them, for
example: images, X-ray, database, or you can click on a node and expand it using the
dedicated "+" button here. If we load an image survey and start to zoom in, we see
that the tree is automatically refreshed according to the current view: the leaves
are colored in green if the collection contains data in the current field of
view and colored in orange otherwise. The leaves in orange can be totally hidden
with the "view" button at the bottom of the panel here. The tree can also be
filtered by a basic keyword constraint: you just type the keyword in the box
here, press return, and this will filter the data collections to show only the
leaves matching the keyword; here SDSS. This filtering can be combined with the
"view" button or the expand button for the data collection tree. We will show in
other videos advanced usage of the data collections tree and different ways to
query the datasets.