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[bug #58640] Error in calculation of SIP to TPV coversions
From: |
Raul Infante-Sainz |
Subject: |
[bug #58640] Error in calculation of SIP to TPV coversions |
Date: |
Tue, 23 Jun 2020 19:09:47 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:77.0) Gecko/20100101 Firefox/77.0 |
Follow-up Comment #13, bug #58640 (project gnuastro):
Thanks a log guys, now it seems to be good. As you can see the agreement
between them are almost perfect! :-)
Using Python:
/ World Coordinate System (WCS)
WCSAXES = 2 / Number of coordinate axes
CRPIX1 = 976.816238403 / Pixel coordinate of reference point
CRPIX2 = 440.521743774 / Pixel coordinate of reference point
PC1_1 = -1.00022174065751 / Coordinate transformation matrix element
PC1_2 = -0.00319660295795 / Coordinate transformation matrix element
PC2_1 = -0.00235639222511 / Coordinate transformation matrix element
PC2_2 = 0.99977077772003 / Coordinate transformation matrix element
CDELT1 = 9.34302943928898E-05 / [deg] Coordinate increment at reference
point
CDELT2 = 9.35240534339602E-05 / [deg] Coordinate increment at reference
point
CUNIT1 = 'deg' / Units of coordinate increment and value
CUNIT2 = 'deg' / Units of coordinate increment and value
CTYPE1 = 'RA---TPV' / TAN (gnomonic) projection + distortions
CTYPE2 = 'DEC--TPV' / TAN (gnomonic) projection + distortions
CRVAL1 = 39.9265010846 / [deg] Coordinate value at reference point
CRVAL2 = -8.12618217247 / [deg] Coordinate value at reference point
LONPOLE = 180.0 / [deg] Native longitude of celestial pole
LATPOLE = -8.12618217247 / [deg] Native latitude of celestial pole
RADESYS = 'FK5' / Equatorial coordinate system
EQUINOX = 2000.0 / [yr] Equinox of equatorial coordinates
PV1_1 = 1.0 / TPV coefficient: x
PV1_4 = 2.74744439572126E-03 / TPV coefficient: xx
PV1_5 = -2.51914579463917E-03 / TPV coefficient: xy
PV1_6 = -4.48803400336329E-03 / TPV coefficient: yy
PV2_1 = 1.0 / TPV coefficient: y
PV2_4 = -2.52742435899630E-03 / TPV coefficient: yy
PV2_5 = 1.75088471295910E-02 / TPV coefficient: yx
PV2_6 = -5.71014067284307E-03 / TPV coefficient: xx
/ Versions and date
DATE = '2020-04-14T13:33:00' / file creation date (YYYY-MM-DDThh:mm:ss UT)
CFITSIO = '3.47 ' / CFITSIO version.
WCSLIB = '6.4 ' / WCSLIB version.
GSL = '2.6 ' / GNU Scientific Library version.
GNUASTRO= '0.11 ' / GNU Astronomy Utilities version.
COMMIT = 'v0.2-21-g1d5a5fa-dirty' / Git's commit description in running dir.
END
Using Gnuastro:
/ World Coordinate System (WCS)
WCSAXES = 2 / Number of coordinate axes
CRPIX1 = 976.81623840 / Pixel coordinate of reference point
CRPIX2 = 440.52174377 / Pixel coordinate of reference point
PC1_1 = -1.00022174065751 / Coordinate transformation matrix element
PC1_2 = -0.00319660295795 / Coordinate transformation matrix element
PC2_1 = -0.00235639222511 / Coordinate transformation matrix element
PC2_2 = 0.99977077772003 / Coordinate transformation matrix element
CDELT1 = 9.34302943928899E-05 / [deg] Coordinate increment at reference
point
CDELT2 = 9.35240534339601E-05 / [deg] Coordinate increment at reference
point
CUNIT1 = 'deg' / Units of coordinate increment and value
CUNIT2 = 'deg' / Units of coordinate increment and value
CTYPE1 = 'RA---TPV' / TAN (gnomonic) projection + distortions
CTYPE2 = 'DEC--TPV' / TAN (gnomonic) projection + distortions
CRVAL1 = 39.9265010846 / [deg] Coordinate value at reference point
CRVAL2 = -8.1261821725 / [deg] Coordinate value at reference point
LONPOLE = 180.0 / [deg] Native longitude of celestial pole
LATPOLE = -8.1261821725 / [deg] Native latitude of celestial pole
RADESYS = 'FK5' / Equatorial coordinate system
EQUINOX = 2000.0 / [yr] Equinox of equatorial coordinates
PV1_1 = 1.0 / TPV coefficient: x
PV1_4 = 2.747444395721E-03 / TPV coefficient: xx
PV1_5 = -2.519145794639E-03 / TPV coefficient: xy
PV1_6 = -4.488034003363E-03 / TPV coefficient: yy
PV2_1 = 1.0 / TPV coefficient: y
PV2_4 = -2.527424358996E-03 / TPV coefficient: yy
PV2_5 = 1.750884712959E-02 / TPV coefficient: yx
PV2_6 = -5.710140672843E-03 / TPV coefficient: xx
/ Versions and date
DATE = '2020-06-23T23:00:35' / file creation date (YYYY-MM-DDThh:mm:ss UT)
CFITSIO = '3.47 ' / CFITSIO version.
WCSLIB = '5.17 ' / WCSLIB version.
GSL = '2.4 ' / GNU Scientific Library version.
GNUASTRO= '0.12.10-ebee' / GNU Astronomy Utilities version.
END
Just curious. I can see that now there are some coefficients that have been
disappeared, any reason for that?
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- [bug #58640] Error in calculation of SIP to TPV coversions, (continued)
- [bug #58640] Error in calculation of SIP to TPV coversions, Mohammad Akhlaghi, 2020/06/22
- [bug #58640] Error in calculation of SIP to TPV coversions, Mohammad Akhlaghi, 2020/06/23
- [bug #58640] Error in calculation of SIP to TPV coversions, Sachin Kumar Singh, 2020/06/23
- [bug #58640] Error in calculation of SIP to TPV coversions, Sachin Kumar Singh, 2020/06/23
- [bug #58640] Error in calculation of SIP to TPV coversions, Mohammad Akhlaghi, 2020/06/23
- [bug #58640] Error in calculation of SIP to TPV coversions, Sachin Kumar Singh, 2020/06/23
- [bug #58640] Error in calculation of SIP to TPV coversions, Mohammad Akhlaghi, 2020/06/23
- [bug #58640] Error in calculation of SIP to TPV coversions, Sachin Kumar Singh, 2020/06/23
- [bug #58640] Error in calculation of SIP to TPV coversions, Sachin Kumar Singh, 2020/06/23
- [bug #58640] Error in calculation of SIP to TPV coversions, Mohammad Akhlaghi, 2020/06/23
- [bug #58640] Error in calculation of SIP to TPV coversions,
Raul Infante-Sainz <=
- [bug #58640] Error in calculation of SIP to TPV coversions, Mohammad Akhlaghi, 2020/06/23
- [bug #58640] Error in calculation of SIP to TPV coversions, Sachin Kumar Singh, 2020/06/23
- [bug #58640] Error in calculation of SIP to TPV coversions, Sachin Kumar Singh, 2020/06/23