<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">If you have access to IRAF you can use the ccsetwcs to put the ccmap database version of the WCS into the FITS header:<div class=""><br class=""></div><div class=""><a href="http://iraf.noao.edu/scripts/irafhelp?ccsetwcs" class="">http://iraf.noao.edu/scripts/irafhelp?ccsetwcs</a></div><div class=""><br class=""></div><div class="">Then astropy will understand the WCS.  But that will only provide the linear components. </div><div class=""><br class=""></div><div class="">JJ</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Mar 25, 2020, at 2:56 AM, Laurent MICHEL <<a href="mailto:laurent.michel@astro.unistra.fr" class="">laurent.michel@astro.unistra.fr</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Dear Astropy,<br class=""><br class="">In the project I'm working on (SVOM), I have to resolve image astrometry with parameters given as IRAF@ccmap input files (*.db).<br class="">I've pasted a sample below.<br class="">As I'm not an IRAF user and my application is Python based, I would like to know whether someone in the community would have some experience with handling such coordinate transformations with AstroPy or some associate package.<br class=""><br class="">Regards<br class="">LM<br class=""><br class=""><blockquote type="cite" class="">begin<span class="Apple-tab-span" style="white-space:pre">       </span>first<br class=""><span class="Apple-tab-span" style="white-space:pre">  </span>xrefmean<span class="Apple-tab-span" style="white-space:pre">    </span>1006.983846153846<br class=""><span class="Apple-tab-span" style="white-space:pre">      </span>yrefmean<span class="Apple-tab-span" style="white-space:pre">    </span>1295.986153846154<br class=""><span class="Apple-tab-span" style="white-space:pre">      </span>lngmean<span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span>51.92749369230773<br class=""><span class="Apple-tab-span" style="white-space:pre">      </span>latmean<span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span>46.71962446153846<br class=""><span class="Apple-tab-span" style="white-space:pre">      </span>pixsystem<span class="Apple-tab-span" style="white-space:pre">   </span>logical<br class=""><span class="Apple-tab-span" style="white-space:pre">        </span>coosystem<span class="Apple-tab-span" style="white-space:pre">   </span>j2000<br class=""><span class="Apple-tab-span" style="white-space:pre">  </span>projection<span class="Apple-tab-span" style="white-space:pre">  </span>tan<br class=""><span class="Apple-tab-span" style="white-space:pre">    </span>lngref<span class="Apple-tab-span" style="white-space:pre">      </span><span class="Apple-tab-span" style="white-space:pre">    </span>51.92764538984333<br class=""><span class="Apple-tab-span" style="white-space:pre">      </span>latref<span class="Apple-tab-span" style="white-space:pre">      </span><span class="Apple-tab-span" style="white-space:pre">    </span>46.71980701217847<br class=""><span class="Apple-tab-span" style="white-space:pre">      </span>lngunits<span class="Apple-tab-span" style="white-space:pre">    </span>degrees<br class=""><span class="Apple-tab-span" style="white-space:pre">        </span>latunits<span class="Apple-tab-span" style="white-space:pre">    </span>degrees<br class=""><span class="Apple-tab-span" style="white-space:pre">        </span>xpixref<span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span>1006.538812424377<br class=""><span class="Apple-tab-span" style="white-space:pre">      </span>ypixref<span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span>1296.240113815674<br class=""><span class="Apple-tab-span" style="white-space:pre">      </span>geometry<span class="Apple-tab-span" style="white-space:pre">    </span>general<br class=""><span class="Apple-tab-span" style="white-space:pre">        </span>function<span class="Apple-tab-span" style="white-space:pre">    </span>legendre<br class=""><span class="Apple-tab-span" style="white-space:pre">       </span>xishift<span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span>785.057480503327<br class=""><span class="Apple-tab-span" style="white-space:pre">       </span>etashift<span class="Apple-tab-span" style="white-space:pre">    </span>-1011.192209060798<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span>xmag<span class="Apple-tab-span" style="white-space:pre">        </span><span class="Apple-tab-span" style="white-space:pre">    </span>0.780016468878781<br class=""><span class="Apple-tab-span" style="white-space:pre">      </span>ymag<span class="Apple-tab-span" style="white-space:pre">        </span><span class="Apple-tab-span" style="white-space:pre">    </span>0.7800388866873553<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span>xrotation<span class="Apple-tab-span" style="white-space:pre">   </span>180.0054358489221<br class=""><span class="Apple-tab-span" style="white-space:pre">      </span>yrotation<span class="Apple-tab-span" style="white-space:pre">   </span>0.003364033436420988<br class=""><span class="Apple-tab-span" style="white-space:pre">   </span>wcsxirms<span class="Apple-tab-span" style="white-space:pre">    </span>0.03777045679395438<br class=""><span class="Apple-tab-span" style="white-space:pre">    </span>wcsetarms<span class="Apple-tab-span" style="white-space:pre">   </span>0.04621390005594472<br class=""><span class="Apple-tab-span" style="white-space:pre">    </span>xirms<span class="Apple-tab-span" style="white-space:pre">       </span><span class="Apple-tab-span" style="white-space:pre">    </span>0.02446609811977102<br class=""><span class="Apple-tab-span" style="white-space:pre">    </span>etarms<span class="Apple-tab-span" style="white-space:pre">      </span><span class="Apple-tab-span" style="white-space:pre">    </span>0.03292506146030702<br class=""><span class="Apple-tab-span" style="white-space:pre">    </span>surface1<span class="Apple-tab-span" style="white-space:pre">    </span>11<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>2.<span class="Apple-tab-span" style="white-space:pre">  </span>2.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>2.<span class="Apple-tab-span" style="white-space:pre">  </span>2.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>2.<span class="Apple-tab-span" style="white-space:pre">  </span>2.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>0.<span class="Apple-tab-span" style="white-space:pre">  </span>0.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>1.<span class="Apple-tab-span" style="white-space:pre">  </span>1.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>2048.<span class="Apple-tab-span" style="white-space:pre">       </span>2048.<br class=""><span class="Apple-tab-span" style="white-space:pre">  </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>1.<span class="Apple-tab-span" style="white-space:pre">  </span>1.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>2048.<span class="Apple-tab-span" style="white-space:pre">       </span>2048.<br class=""><span class="Apple-tab-span" style="white-space:pre">  </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>-14.02246741249724<span class="Apple-tab-span" style="white-space:pre">  </span>-211.9665257906808<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>-798.346852301705<span class="Apple-tab-span" style="white-space:pre">   </span>0.07577120489887789<br class=""><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>0.04687505246502031<span class="Apple-tab-span" style="white-space:pre"> </span>798.3697991484097<br class=""><span class="Apple-tab-span" style="white-space:pre">      </span>surface2<span class="Apple-tab-span" style="white-space:pre">    </span>14<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>2.<span class="Apple-tab-span" style="white-space:pre">  </span>2.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>3.<span class="Apple-tab-span" style="white-space:pre">  </span>3.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>3.<span class="Apple-tab-span" style="white-space:pre">  </span>3.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>2.<span class="Apple-tab-span" style="white-space:pre">  </span>2.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>1.<span class="Apple-tab-span" style="white-space:pre">  </span>1.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>2048.<span class="Apple-tab-span" style="white-space:pre">       </span>2048.<br class=""><span class="Apple-tab-span" style="white-space:pre">  </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>1.<span class="Apple-tab-span" style="white-space:pre">  </span>1.<br class=""><span class="Apple-tab-span" style="white-space:pre">     </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>2048.<span class="Apple-tab-span" style="white-space:pre">       </span>2048.<br class=""><span class="Apple-tab-span" style="white-space:pre">  </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>0.01209115687180025<span class="Apple-tab-span" style="white-space:pre"> </span>-0.01371667420039151<br class=""><span class="Apple-tab-span" style="white-space:pre">   </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>-0.001595934377758362<span class="Apple-tab-span" style="white-space:pre">       </span>0.01973382792045219<br class=""><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>0.01870940742458613<span class="Apple-tab-span" style="white-space:pre"> </span>-0.03495580079513902<br class=""><span class="Apple-tab-span" style="white-space:pre">   </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>-0.04682685192837127<span class="Apple-tab-span" style="white-space:pre">        </span>0.05029843125259523<br class=""><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>0.02206659476379174<span class="Apple-tab-span" style="white-space:pre"> </span>-0.06407294737100595<br class=""><span class="Apple-tab-span" style="white-space:pre">   </span><span class="Apple-tab-span" style="white-space:pre">    </span><span class="Apple-tab-span" style="white-space:pre">    </span>0.09651497861498953<span class="Apple-tab-span" style="white-space:pre"> </span>-0.103465418301487<br class=""># Fri 10:57:09 13-Mar-2020<br class=""></blockquote><br class=""><br class=""><br class="">-- <br class="">---- Laurent MICHEL              Tel  (33 0) 3 68 85 24 37<br class="">     Observatoire de Strasbourg  Fax  (33 0) 3 68 85 24 32<br class="">     11 Rue de l'Universite      Mail <a href="mailto:laurent.michel@astro.unistra.fr" class="">laurent.michel@astro.unistra.fr</a><br class="">     67000 Strasbourg (France)   Web  <a href="http://astro.u-strasbg.fr/~michel" class="">http://astro.u-strasbg.fr/~michel</a><br class="">---<br class="">_______________________________________________<br class="">AstroPy mailing list<br class=""><a href="mailto:AstroPy@python.org" class="">AstroPy@python.org</a><br class="">https://mail.python.org/mailman/listinfo/astropy<br class=""></div></div></blockquote></div><br class=""></div></div></body></html>