taskGNU Astronomy Utilities - Tasks: task #15669, Calculating forward coefficients...

 
 

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task #15669: Calculating forward coefficients of TPV to SIP

Submitter:  Sachin Kumar Singh <sks_15>
Submitted:  Tue 02 Jun 2020 06:48:45 PM UTC
   
 
Should Start On:  Tue 02 Jun 2020 12:00:00 AM UTC Should be Finished on:  Tue 02 Jun 2020 12:00:00 AM UTC
Category:  None Priority:  5 - Normal
Item Group:  New feature Status:  Done
Privacy:  Public Assigned to:  sks_15
Percent Complete:  100% Open/Closed:  Closed
Effort:  0.00

Tue 02 Jun 2020 09:23:12 PM UTC, comment #1: 

Now, features are implemented to do the tpv->sip translation for forward coefficients. They are pushed here. The final results in the headers of the python implementation(using sip_tpv module in astropy which is done here) and the test GnuAstro library are shown below:

Using sip_tpv module in astropy:

A_0_0   =  -0.5947048847413352
A_0_1   = 0.000511373196373184
A_0_2   = 9.71733789710970E-07
A_0_3   = -6.2376422946773E-10
A_1_0   = 0.000870132842249571
A_1_1   = 5.60499034638399E-07
A_1_2   = -2.5505398795854E-10
A_2_0   = 1.01770599638340E-07
A_2_1   = -2.1900816534747E-10
A_3_0   = -4.3245647824626E-10


Using test GnuAstro library:

A_0_0   =  -5.947048847413E-01 / SIP distortion coefficient:
A_0_1   =   5.113731963732E-04 / SIP distortion coefficient: y
A_0_2   =   9.717337897110E-07 / SIP distortion coefficient: yy
A_0_3   =  -6.237642294677E-10 / SIP distortion coefficient: yyy
A_1_0   =   8.701328422496E-04 / SIP distortion coefficient: x
A_1_1   =   5.604990346384E-07 / SIP distortion coefficient: xy
A_1_2   =  -2.550539879585E-10 / SIP distortion coefficient: xyy
A_2_0   =   1.017705996383E-07 / SIP distortion coefficient: xx
A_2_1   =  -2.190081653475E-10 / SIP distortion coefficient: xxy
A_3_0   =  -4.324564782463E-10 / SIP distortion coefficient: xxx


So this task can now be closed:-)

Sachin Kumar Singh <sks_15>
Tue 02 Jun 2020 06:48:45 PM UTC, original submission:  

This is a subtask of task #15128 where it is required to do SIP <--> TPV conversions. Currently, the TPV coefficients are translated to forward SIP and the work is almost done.  What remains now is to do conversions to reverse coefficients.

Sachin Kumar Singh <sks_15>

 

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    Date Changed by Updated Field Previous Value => Replaced by
    2020-06-02 sks_15 StatusIn Progress Done
        Percent Complete40% 100%
        Open/ClosedOpen Closed
    2020-06-02 sks_15 SummaryTPV to SIP conversions subtask Calculating forward coefficients of TPV to SIP

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