The image viewer provides a graphical means for interacting with NOAO Science archive imaging data. The entire field may be displayed, or one may zoom and pan on any portion of the field. Functions are provided for extracting science-grade image cutouts.
The image viewer represents an experiment in what is possible in terms of interactive image display using standard Web browsers to access Web services provided by a remote archive server. Web technology is evolving rapidly and the image viewer may not work properly, or at all, with some browsers. It is known to work with Netscape (v4) and Mozilla browsers on Unix-based platforms (e.g., Solaris, Linux, FreeBSD), and with Netscape 4 and Internet Explorer 5.5+ on Windows platforms. Others, including lesser-known or older browsers are not compatible. Better standards for Web browsers are coming however, and this situation should improve in the future.
|Main Image Window||Displays a region of the survey field at the current viewport center and scale.|
|Pan Window||Displays the entire field at a greatly reduced scale. Click anywhere in the pan window to pan the main image window to that point.|
The control panel provides a manual Reset button,
Zoom In/Out buttons, a Digital Panner controlled by the
Pan Step tool, and a Scale tool.
Image selections can be made by manually entering image coordinates
into the text fields provided. Entry into the WCS boxes are planned
for the future.
|Image Click Functions|| The Image Click Functions are represented by the following set of buttons.
Each button determines what happens when a point is clicked in the
Main Image Window. The zoom and pan buttons
take the point clicked as the center of the image.
The select function chooses the center of the selected region of interest as
the new field center. Clicking in the image when the cutout mode is active
generates a request to the cutout script. The cutout script produces an image
specified by the coordinates shown in the coordinate boxes in the
|Real-Time WCS Tangent Plane Display||Moving the mouse in either the Main Image Window or the Pan Window causes the Right Ascension and Declination and the (x,y) position of the mouse to be displayed in real time in the status line area of the browser window. Exactly where this is depends upon the browser type and may differ from what is shown above. The FITS file prefix is also shown.|
The image viewer should work with any recent-vintage Web browser - provided the viewer has been "ported" to that particular browser. Browsers differ in the functionality provided and the way the functionality is packaged, sometimes drastically. Display may be different for each browser.