ST-ECF Archive Simple Image Access Service for Preview System Cannot query. Region Of Interest is not set. containing a short (usually one line) description of the image representing the ICRS right-ascension of the center of the image. representing the ICRS declination of the center of the image. with the array value giving the length in pixels of each image axis. with the array value giving the scale in degrees per pixel of each image axis. specifying the MIME-type of the object associated with the image acref, e.g., "image/fits", "text/html", and so forth. specifying the URL to be used to access or retrieve the image. Since the URL will often contain metacharacters the URL is normally enclosed in an XML CDATA section (...) or otherwise encoded to escape any embedded metacharacters. identifying the bandpass by name (e.g., "V", "SDSS_U", "K", "K-Band", etc.). specifying the characteristic (reference) frequency, wavelength, or energy for the bandpass model. specifying the upper limit of the bandpass. specifying the lower limit of the bandpass. specifying the mean mjd of the observation. specifying the instrument used to make the observation. "TAN", "ARC", "SIN", and so forth specifying the celestial projection, as for FITS WCS. specifying the image pixel coordinates of the WCS reference pixel. This is identical to "CRPIX" in FITS WCS. specifying the world coordinates of the WCS reference pixel. This is identical to "CRVAL" in FITS WCS. specifying the WCS CD matrix. This is identical to the "CD" term in FITS WCS, and defines the scale and rotation (among other things) of the image. Matrix elements should be ordered as CD[i,j] = [1,1], [1,2], [2,1], [2,2]. exposure time in seconds Field of view resolution Orientation of the slit (N=0 E=90), i.e. position angle between the North axis and the reference Y axis of the observation. V3 position angle. This is the value to pass for obtaining the right footprint Reference to ID of an extra resource with the coordinates of FOV vertexes. It is mandatory that the ref here and the ID of the extra resource match specifying the number of image axes. identifying the units used to represent spectral values, selected from "meters", "hertz", and "keV". No other units are permitted here; the client application may of course present a wider range of units in the user interface.