We are busy
working on a new
CDAT release version CDAT-v5.0.
big release will bring several new exciting features to the CDAT
community. We expect to have the 'Beta'
version ready for release in October 2007. We
will be releasing CDAT
v4.3 in August with a small subset of features listed
The new features include:
- LAS CDAT
interface to IPCC data
- New VCDAT
- Light version
- Point & click edit in VCS canvas with GUI
- NetCDF 4.0 with
- New numPy
which will replace pyFor
Earth with CDAT
- iCDAT- Adobe
Flash web application
One of the most exciting addition into CDAT
to be introduced in version 5.0 is the new look and feel + new
capabilities of VCDAT
- the CDAT's GUI interface. We added several very useful navigational
features to the standard VCDAT GUI and linked it to the so-calledVCDAT Light.
You will be able to choose to work in VCDAT (full version) or in VCDAT
Light, which introduces VCS GUI
and click template edit capabilitiesand a very clean
and easy user interface. You will be able to switch back and forth
between the more sophisticated full version of VCDAT and the VCDAT
Light in the same session.
The navigating features added to both
versions of VCDAT include extended
variable listing that includes the variables shape and long name together
with the units.
The display divides the variables into 1D, 2D, 3D, etc. dimensions groups.
We think you will come to love that feature. See the example screen
Once you selected a variable you will see
the variables info displayed at the top of the window.
Another great feature is the ability to lock and unlock any dimension.
This is done by clicking on the little lock icon at the top of each
axis dimension on the left side of the dimensions navigation sliders.
Click once and you will lock the lock, click again and you
will unlock it.
Often one needs to look at the zoom of a
particular dimension, say only a window in time, or particular region
in (lon, lat) space or particular height region. You will now have the
ability to choose say a height region, lock the height dimension, and
now whenever you plot any variable that has this dimention, it will be
displayed within chosen height region only, so effectively the default
height region is now the chosen min and max values. If you
are curious to see the full height but do not want to reset the new
default, you can move the sliders without unlocking the height dim.
If on the other hand you want to reset the defaults, just
unlock the lock and choose new region, then lock the dim again to keep
it as new default. You will find it extremelly handy at
times. The locks work also on the dimensions/axis order and are very
handy when you need to change the pressure levels to be displayed from
highest to lowest.
VCDAT Light is meant to be a
'light' version of VCDAT and as such, it is stripped from the template
edit and variables calculation window, as shown in the images above.
The template edit capabilities are moved to the new VCS GUI canvas,
with point and click edit feature, where you will be able to for
the horizontal colormap and drag it to become a vertical colormap of
the length and width of your choice. By default, when you open a canvas
in VCDAT Light - it will come up as a VCS GUI canvas. You can switch to
a standard canvas, but you will have to close the GUI one first. In the
full VCDAT, the only available canvas is the standard
We are eager to see how you will like the
new features, please give us an input on your thoughts on
CDAT in VisTrails
while originally (and solely) developed by researchers at the
University of Utah that provides support for data exploration and
visualization, is being applied to climate data analysis and
visualization as part of the SciDAC2 Visualization and Analytics Center
for Enabling Technology (VACET).
It is a new scientific workflow management system. Few CDAT modules had
been already connected with the
VisTrails through the common interfaces and you can see that one can
now use the visual workflow interface to connect CDAT module boxes and
perform calculations in CDAT to produce the desired
The result of the CDAT run can be
viewed for example in a spreadsheet application:
This is a new and exciting new GUI
application interface for CDAT and we are exploring it and
working on extending the module interfaces to include most of CDATs
- LAS CDAT
Server (LAS)is a software that provides
visualization and subsetting of multi-dimensional scientific data for
Web users, enabling visualization, subsetting, and reformatting.
On-the-fly visualization makes it possible to explore the dataset
entirely within a Web browser environment. Should further analysis at
the desktop be desirable subsetting allows the scientist to download
small units of data that move efficiently on the Internet. Reformatting
makes it simple to ingest the data into the scientist’s
choice of desktop environments.
enables browsing and downloading of theIPCCESG climate
model simulations data holdings resident at PCMDI, LLNL (Program for
Climate Model Diagnosis and Intercomparison). In order to view the
IPCC ESG data you need to have an accout on the ESG. If you don't have
one, just go to ESG
and request an accout by filling out
You can enter
the user/password that you will get for the ESG server. After
successful log in you will be presented with the high level overview of
the ESG data holdings.
The bar at the top shows you that you
are logged in and enables you to Logout.
It also has a link to the Index
of all the data holding.
The window on the left is a menu bar.
To plot a variable you will need to choose a Dataset, a Variable
and Constraints. The
current selection is highlighted by the bold face font. As you can see
we are now in 'Datasets' menu.
the right window you will see the top index of all the
experiments. Click on the experiment you want to explore to see the all
the datasets belonging to this type of experiment. For example click on
and then on 'ukmo_hadgem1'
and you will see the following window:
the dataset name, there is an information icon 'i'. By clicking it
you can check what variables are given in that dataset:
and from the previous window select the dataset you are interested in
and click on it. You will now turn to selecting variables tab - which
is shown by highlighting the 'Variables'
menu in the left hand side menu:
Choose a variable and then click red letters
on the right hand side of the window. You will now be able to constrain
you selection for plotting by choosing a view (a line plot,
lat/lon, Hovmoller plot, or volume plot), an output (plot type
like boxfill, isofill etc, or NetCDF) and a region (full region
or a continent or a region) . You can also select your exact lon/lat
region coordinates. Then select time
and plot size and continent plotting
options. When you are satisfied with your selection click
on the right hand side of the window.
The window will appear notifying you that
CDAT LAS is working on your plot:
Next this window will close and the plot
will appear in a new window:
Experiment with selecting a region with the
mouse by clicking and dragging the mouse, as we did in this
select the 'NetCDF' output, you will be presented with the link to
where to get the data from, you can right click on the link and save
the data to you hard drive.