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 User's Guide |
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NCSA Astronomy Digital Image Libary Help: Image Preview Page
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About the Preview Page
The Preview Page provides a quick look at one plane of a selected
image along with some of the basic information about it. The user
can view a Preview Page after a successful
search of the Library's database;
clicking on the matched image entry on the
Query Results Page will bring up the Preview Page for that
image. The user can also directly access the Preview Page for an
image via its codename.
While the exact contents and layout of an Image Preview Page can vary,
it usually contains the following in some form:
- Title and authors of the
project.
- The image's name and
codename.
The name is provided by the authors of the project and may be
used in other project documents (such as the abstract) to refer
to the current image. The codename is
used when directly accessing this image.
Example: Codename: 95.DR.01.01
(SgrAWest_Continuum)
Here SgrAWest_Continuum is the image name, and
95.DR.01.01 is the image codename.
- Information about what the image represents; this might
include the Object Name, Type, and Spectral
Line (if applicaple) for the image.
- A preview image of a selected plane (usually the central plane)
in the image cube. The preview image may be a subsampled version
of the image contained in the library.
- The File Size for the FITS image.
- Links to article abstracts from the
ADS
Abstract Service that report on the project's science.
- A formatted summary of the image header. (A full listing of the
FITS header can be viewed by clicking the
FITS Header link below the this section.)
- Links that display other
information or operations related to the image data.
- A list of any additional data files associated with the image
provided by the authors, such as table data, diagrams, or
PostScript figures.
- The searchable keywords and their values which describe the image
within the Library's database.
Links to more information or operations directly related to the image
are marked with the icon, 
.
These can include:
-
Project Overview
- displays the Project Page for this image.
-
Abstract and Project Description
- displays the project abstract (usually in a seperate browser
window).
-
FITS Header Keywords
- lists the full FITS header, excluding the FITS history.
-
FITS Header History
- lists the FITS history portion of the FITS header. The FITS
history serves as a record of the image processing that went into
producing the image.
-
Movie Page
- displays page from which the user can select other planes in
the image to view. This can either be seen as an MPEG movie or
as seperate images tiled in the browser window. This button
will not appear on the Preview Page if the image only contains
one plane.
-
Download the FITS Image
- initiates a request to download the image. Downloading images
can take several minutes or (even hours) depending on the size of
the image and the network load between you and the Library.
Additional delay (usually less than 10 minutes) can result if the
FITS file must be retrieved from long term storage.
The Image Codename
Every image in the Library has a unique codename that allows it to be
accessed directly. For example, the Preview Page for an image having
the codename 95.DR.01.02 may be accessed via the URL
/document/95.DR.01.02.
An image codename contains four fields. For example, the fields in
95.DR.01.02 translate as:
95 = year of deposit into the Library.
DR = initials of first author of the
project to which the
image belongs.
01 = first project by the
author in that year
02 = second image within its
project
Note that projects have
unique codenames associated with them as well. For instance, the
image 95.DR.01.01 is part of the project 95.DR.01.
The Astronomy
Digital Image Library is a project of
Radio Astronomy Imaging
Team
at the National Center
for Supercomputing Applications on the campus of the
University of Illinois at
Urbana-Champaign
Contact the ADIL:
adil@ncsa.uiuc.edu