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• TAP Here is the IVOA standard for Table Access Protocol. 
• SIAP  Here is the IVOA standard for  Simple Image Access Specification.  The required meta data fields for image:
  
  1. NAXISThe size of the output image in pixels. This is a vector-valued quantity, expressed as "NAXIS=<width>,<height>". If only one value is given it applies to both image axes. Default: determined from the ROI (see below). This is the only image generation parameter likely be supported by a cutout service.
  2.  CFRAMEThe coordinate system reference frame, selected from ICRS, FK5, FK4, ECL, GAL, and SGAL (these abbreviations follow CDS Aladin). Default: ICRS.

  3. EQUINOXEpoch of the mean equator and equinox for the specified coordinate system reference frame (CFRAME). Not required for ICRS. Default: B1950 for FK4, otherwise J2000.

  4. CRPIXThe coordinates of the reference pixel, expressed in the pixel coordinates of the output image, with [1,1] being the center of the first pixel of the first row of the image. This is a vector-valued quantity; if only one value is given it applies to both image axes. Default: the image center.

  5. CRVALThe world coordinates relative to CFRAME at the reference pixel. This is a vector-valued quantity; both array values are required. Default: the region center coordinates (POS) at the center of the image, transformed to the output coordinate system reference frame if other than ICRS. If CRPIX is specified to be other than the image center the corresponding CRVAL can be computed, but should be specified explicitly by the client.

  6. CDELTThe scale of the output image in decimal degrees per pixel. A negative value implies an axis flip. Since the default image orientation is N up and E to the left, the default sign of CDELT is [-1,1]. This is a vector-valued quantity; if only one value is given it applies to both image axes, with the sign defaulting as specified above. Default: implied (see below), otherwise service-specific.

  7. ROTANGThe rotation angle of the image in degrees relative to CFRAME (an image which is unrotated in one reference frame may be rotated in another). This is the rotation of the WCS declination or latitude axis with respect to the second axis of the image, measured in the counterclockwise direction (as for FITS WCS, which is in turn based on the old AIPS convention). Default: 0 (no rotation).

  8. PROJThe celestial projection of the output image expressed as a three-character code as for FITS WCS, e.g., "TAN", "SIN", "ARC", and so forth. Default: TAN.

• SSA  Here is the IVOA standard for   Simple Spectral Access Protocol. The required meta data fields for spectrum:

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