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Re: Full-Disk Orthographic to Cylindrical Projection [message #83539 is a reply to message #83535]

Mon, 11 March 2013 14:20

Tyler Behm
Messages: 2
Registered: March 2013

Junior Member

Edit to OP: cmap=map_proj('Cylindrical') should be cmap=map_proj_init('Cylindrical')

David. Although I have read that article and many others of yours, I still need to read them more. They have been very helpful.

On Monday, March 11, 2013 1:14:16 PM UTC-6, Craig Markwardt wrote:

Do you start with astronomical FITS images with world coordinates? The IDL Astronomy Library provides truly excellent routines for remapping images with FITS world coordinates.

Craig, I am familiar with the Astronomical Library's good coordinate transform routines like wcssph2xy.pro. Unfortunately, these FITS do not have world coordinates.

The solar images can be found at ftp://diglib.nso.edu/Evans_spectroheliograms/CaK/1988/

Most of the header is just info about the viewing geometry. I used "print, headfits('880110.1555c.fts') and got:

SIMPLE = T / FITS STANDARD /
BITPIX = 16 / FITS BITS/PIXEL /
NAXIS = 2 / NUMBER OF AXES /
NAXIS1 = 1952 /
NAXIS2 = 1896 /
BSCALE = 1.0 / REAL = TAPE*BSCALE + BZERO /
BZERO = 0.0 /
BZERO = 0.0 /
ORIGIN = 880110.1555c.fit /
DATE_OBS = 1988/01/10 /
TIME_OBS = 15:55 /
SOLP = -71.80 /
SOLB = -4.10 /
CRPIX1 = 891 /
CRPIX2 = 1044 /
R_SUN = 785 /
SOLR = 785 /
CENTER_X = 891 /
CENTER_Y = 1044 /
DATE_OBS = '1988-01-10T15:55 ' /
SOLAR_P = -71.80 /
CDELT = 0 /
TEL_P_ang = 251.59 /
DEL_RX = 0.00 /
DEL_RY = 0.00 /
Scatt1 = 35540.30 0.35 /
Scatt2 = 34133.02 0.36 /
Kf_Scatt = 0.92 /
Kf_lin = 0.00 /
Kf_exrtr = 0.00 /
END

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[Message index]

		Re: Full-Disk Orthographic to Cylindrical Projection By: Craig Markwardt on Mon, 11 March 2013 17:34
		Re: Full-Disk Orthographic to Cylindrical Projection By: Tyler Behm on Mon, 11 March 2013 14:20
		Re: Full-Disk Orthographic to Cylindrical Projection By: Craig Markwardt on Mon, 11 March 2013 12:14
		Re: Full-Disk Orthographic to Cylindrical Projection By: David Fanning on Mon, 11 March 2013 11:07

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