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Vectorized Solar Azimuth and Elevation Estimation

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4.4 | 5 ratings Rate this file 48 Downloads (last 30 days) File Size: 3.58 KB File ID: #23051 Version: 1.1
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Vectorized Solar Azimuth and Elevation Estimation

by

Darin Koblick (view profile)

 

20 Feb 2009 (Updated )

Predict the topocentric solar position defined by geodetic lat, lon, Alt, and a universal time

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File Information
Description

Predict the azimuth and elevation of the Sun within +/- 1 degree at any geodetic latitude, longitude and altitude. Due to popular demand, this routine has been vectorized for speed.

Function Call: [Az El] = SolarAzEl('2008/02/18 13:10:00',60,15,0)

Input List:
UTC Date and Time - Use format YYYY/MM/DD hh:mm:ss or MATLAB date vector dimensions can be [N x 1]
Latitude - Site Latitude in degrees -90:90 -> S(-) N(+) dimensions can be [N x 1]
Longitude - Site Longitude in degrees -180:180 W(-) E(+) dimensions can be [N x 1]
Altitude - Site Altitude in km dimensions can be [N x 1]
 
Output List:
Az - Solar Azimuth angle in degrees [N x 1]
El - Solar Elevation/Altitude Angle in degrees [N x 1]

Acknowledgements

This file inspired Right Ascension/Declination To Azimuth/Elevation and Spot Solar Panel Orientation Toolbox.

MATLAB release MATLAB 7.7 (R2008b)
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Comments and Ratings (6)
27 Jun 2016 Tunahan Liman

I need a code something like that. How can I get the codes?

Comment only
12 May 2016 Chad Greene

Chad Greene (view profile)

Superb. This function is well written and well documented. Thanks for sharing!

19 Feb 2015 L. He

L. He (view profile)

very nice program. I compare it with
http://www.mathworks.com/matlabcentral/fileexchange/4605-sun-position-m

the result is almost same. That one is more accurate,but not Vectorized yet.

Note: please change this line
jd = juliandate(datestr([y,mo,d,h,mi,s],'yyyy/mm/dd HH:MM:SS'),'yyyy/mm/dd HH:MM:SS');
do not use datestr but use date_num directly.
this will boost the speed, a lot

08 Apr 2013 Per

Per (view profile)

Very useful function. With a few updates it can handle vector time input. I would prefer the use of matlab UTC time input in order to speed up.

27 Aug 2009 Phil

Phil (view profile)

Ropey when using vector times: (line 36 generates a vector eccentricity: line 42 then requires an edit to force array multiply not matrix multiply). Still unable to get vector time version to agree with loop version....
As Mr. Picky, I would prefer time argin to be Matlab datenum, not string.
HOWEVER, this is the only code I've found that gives Azimuth round the full 360: most are 0-180 and it's up to you to find if its in the east or west... due to using code like
http://en.wikipedia.org/wiki/Solar_azimuth_angle
Thanks

19 Mar 2009 Anthony Kendall

Excellent function, it's fast, compact, and easily modified for my particular needs. Thank you very much! BTW, I compared it with sun position tables, (http://www.srrb.noaa.gov/highlights/sunrise/azel.html) and it does very well.

Updates
18 Apr 2013 1.1

Vectorized routine. Added the ability to take either UTC time string, or an array of MATLAB date vectors.

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