This service is an add-on of the VizieR upload service based on the Saada engine. It establishes the compatibility of a FITS resource (spectra/image) with the ObsCore Data Model of the Virtual Observatory.

Understanding the validation
The validation service makes a mapping between FITS header and the ObsCore DataModel using standardized FITS keywords and the most popular WCS projections (including the TNX WCS (IRAF)). Other WCS projections or incomplete WCS header are not resolved by the service.