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FITS Astrometry and Calibration

ADD_DISTORTAdd SIP distortion parameters into a FITS header
AD2XYUse astrometry structure to convert celestial to pixel coordinates
ADXYUse FITS header to convert celestial (RA,Dec) to pixel coordinates
CONS_DECObtain the X and Y coordinates of a line of constant declination
CONS_RAObtain the X and Y coordinates of a line of constant right ascension
EXTASTEXTract ASTrometry parameters from a FITS header into an IDL structure
FITS_ADXYUse a FITS file to convert from world to pixel coordinates
FITS_XYADUse a FITS file to convert from pixel to world coordinates
GET_EQUINOXReturn a numeric equinox value from a FITS header
GETROTGET ROTation and plate scale from a FITS header
GSSS_STDASTInsert the closest tangent projection astrometry into an STScI Guidestar Survey Image
GSSSADXYConvert RA, Dec to pixel coordinates for an STScI survey image
GSSSEXTASTExtract astrometry parameters from an STScI Survey Image
GSSSXYADConvert pixel coordinates to RA, Dec for an STScI survey image
HASTROMRotate, Congrid, and/or shift an image until astrometry matches that in a reference FITS header. Used to align images.
HBOXAVEBoxaverage an image and update astrometry in a FITS header
HCONGRIDCONGRID an image and update astrometry in a FITS header
HEULERConvert between Galactic, celestial and ecliptic coordinates in FITS a header
HEXTRACTExtract a subimage and update astrometry in a FITS header
HPRECESSPrecess the astrometry in a FITS header to a new equinox.
HREBINREBIN an image and update the astrometry in a FITS header
HREVERSEReverse an image about either dimension and update astrometry in a FITS header
HROTRotate an image and update astrometry in a FITS header.
HROTATEApply IDL ROTATE function and update astrometry in a FITS header
MAKE_ASTRBuild an astrometry structure from input parameter values
PRECESS_CDPrecess coordinate description (CD) matrix in a FITS header to a new equinox. Called by HPRECESS
PUTASTPut astrometry parameters (e.g. rotation, plate scale) into a FITS header.
SIP_EVALCompute distorted coordinates given SIP (simple imaging polynomial) coefficients
SOLVE_ASTROSolve for an tangent-plane astrometric plate solution with optional distortion terms.
STARASTObtain an exact astrometry solution given the coordinates and plate position of 2 or 3 stars.
TNX_EVALCompute distorted coordinates give TNX (IRAF) projection
TPV_EVALCompute distorted coordinates given TPV (Tangent + PV_ polynomial) coefficients
UPDATE_DISTORTUpdate SIP astrometry coefficients for a linear transformation
WCS_CHECK_CTYPECheck that pair of CTYPE parameters conform to WCS format.
WCS_GETPOLECompute the coordinates of the native pole for non-polar projection
WCSSPH2XYConvert between longitude,latitude to X,Y angular coordinates for 25 different map projection types
WCSXY2SPHInverse of WCSSPH2XY
WCS_DEMODemo program for WCSSPH2XY and WCSXY2SPH
WCS_ROTATERotate between standard (e.g. celestial) and native coordinates
XYADUse FITS header to convert pixel (X,Y) to celestial(RA, Dec) coordinates
XY2ADUse astrometry structure to convert pixel to celestial coordinates
XYXYConvert X,Y values on one image to X,Y values in another image using astrometry in the FITS headers