Step 2 - fill in the on-line form using the boxes and buttons
provided. The various options are described below.
Coordinates: The form should ignore all input characters
apart from numbers and + or - and replaces them with blanks.
i.e if you wanted to enter the RA and Dec as 08:09:32.6 -36:04:55
the form will
work but it is really expecting 08 09 32.6 -36 04 55 so to avoid mis-interpretation
try and stick to this format. For the l,b co-ordinate
option you should always enter values in decimal
degrees (e.g. 253.2914 -1.6125)
Equinox: Select J2000 (default) or B1950 from the menu if using RA/Dec
X-Y region size: Enter values for the size of the rectangular region to be extracted
in X and Y in arcminutes;
e.g. 0.1 < size < 30 arcmin for a square region. If a rectangular region is required this must
not exceed a total area of 900.sq.arcmin.
Galactic Plane survey waveband: Select either the H-alpha, SR or both button
for the pixel image(s) you wish to obtain.
The on-line availability of the Galactic Plane H-alpha survey fields can be found under Galactic Plane coverage.
Pixel Units: There are three choices available: Density (default), Intensity and
Transmission. Again this choice is a new feature introduced for the SHS data and is not
available for the standard SSS which uses pixel units in density space converted to an integer
range from 0-32767.
Apply Flat-Field correction: This option, unique to the H-alpha survey data, is offered
due to the low level (few percent) transmission variations that occur across the surface of
the narrow-band inteference filter used to obtain the H-alpha survey images. These can, in
be moderated by use of a Flat-field pretty much in the same way that a normal CCD image is
corrected. Images of the H-alpha survey Flat-Field and further details about this option are
given here so the user can make an informed choice as to whether this
option should be selected. Note however that the IAM object data produced from the
SuperCOSMOS scans has been derived in the standard way without the application of a Flat-Field.
GIF: If you wish a GIF image of the area(s) requested click the circle
next to "yes" to over-ride the deafult "no". Producing the GIF file(s)
takes a bit more
time. Note that the GIF images are intended for visualisation purposes only and are not
meant for serious scientific use. Also note that a FITS file is always returned.
Once downloaded, FITS files can be readily converted to GIFs, JPEGs etc, e.g. using "xv".)
Once the form is filled in click on "send". An example of a filled-in
form as a screen capture is given