Rank: 1089 based on 99 downloads (last 30 days) and 1 file submitted
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Vincent Roy

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Hyperspectral remote sensing

 

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23 Feb 2009 Screenshot sun_position.m Sun position given observer time/location. Author: Vincent Roy elevation, earth sciences, zenith, azimuth, astronomy, sun position 99 16
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4.8 | 17 ratings
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15 Jul 2009 sun_position.m Sun position given observer time/location. Author: Vincent Roy E, K

Very helpful submission
23 Jan 2009 sun_position.m Sun position given observer time/location. Author: Vincent Roy Falofolio

Great tool! Good job! However, I wonder, if there will be an update on this script, after reading Jeff Gullett's remarks on the code?

06 Jan 2009 sun_position.m Sun position given observer time/location. Author: Vincent Roy Gullett, Jeff

I have found a few other discrepancies in the algorithm. In the 2005 version of the document, the algorithm to compute the topocentric sun declination (eqn #39, line #825) contains the variable 'y' in the denominator, but the code presented later in the pdf document has the variable 'x' in its place. In the 2008 version of the algorithm document, this difference is resolved and the variable should be 'x' (as in the C-code, so it needs to be changed in the m-code presented on this page). Also, when computing the mean obliquity of the ecliptic (eqn #24, line #733), the documented steps have one of the terms as "-4680.93", but again, the C-code from the appendix used the term "-4680.96". Unfortunately, this discrepancy still exists in the 2008 document, so I don't know which term is correct. Using the wrong one will result in an error greater than the maximum error claimed by the algorithm designers.
19 Nov 2008 sun_position.m Sun position given observer time/location. Author: Vincent Roy RAMOS, EDGAR

Congrats guy!!
11 Nov 2008 sun_position.m Sun position given observer time/location. Author: Vincent Roy Salinas, Lu

Has anyone done this same script but in excel? I've been trying it and I still have some formula wrong... I guess I'm confuse with the t ut or the radians and degrees...
Would anyone want to give it a check?
Top Tags Applied by Vincent
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azimuth, earth sciences, elevation, sun position, zenith
Files Tagged by Vincent
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
23 Feb 2009 Screenshot sun_position.m Sun position given observer time/location. Author: Vincent Roy elevation, earth sciences, zenith, azimuth, astronomy, sun position 99 16
  • 4.76471
4.8 | 17 ratings
 

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