Southern Hemisphere Test Fodder Request

[Kelly]

Hello,

I'm looking for a few datasets of panoramas that were photographed in the southern hemisphere for research purposes and testing solar azimuth calculations. If you're okay with sharing; e.g., on Google drive, Dropbox, etc., but do not wish them published, please inform me. I'll post notice here in this thread once my article has been published.

Thank you very much for your help!

Kind regards,

Kelly

vkbellis at gmail.com

Dataset Criteria

• Shot south of the equator
• Minimum clear sky; enough to clearly see entire disk of the sun
• Drone images preferred, but terrestrial datasets are also okay
• Original images with all metadata
• Precise time with UTC offset
• Precise geographic location in WGS84 reference frame; n.b., typically given by all devices, though seldom ever stated or explained

[Erik Krause]

Am 10.03.26 um 14:17 schrieb Kelly:

> testing solar azimuth calculations.
Wolfram Alpha calculates the azimuth perfectly. I even have a script /
batch file that reads GPS data from a jpeg file and calls Wolfram Alpha
to show the Azimuth:
https://erik-krause.de/ttt/?Lang=en#wolframalphaazimuth

--
Erik Krause

[Kelly]

Hello Erik,

BIG HEART thank you for your work on this elegant bat calling for WolframAlpha - props to you and Wolfram! 

RE:  > testing solar azimuth calculations. - I should explain a bit further, and why the request for panorama datasets from the southern hemisphere. My calculations include the determinations of solar azimuths, and your droplet wolfram_azimuth.bat will certainly make this easier for many instances, but my calculations go further to determine the correct PTGui Numerical Transformation, Yaw: value to use for orienting the panorama to True North.

For the past month, I've been playing around with 26-image drone datasets produced by the DJI Fly app's default Panorama routine, and in particular parsing the (online & elsewhere) vagaries between DJI XMP FlightYawDegree and GimbalYawDegree. 
Their differences ( Δ =  FlightYawDegree  -  GimbalYawDegree ) are often broadly varying in range, even when the physical alignment of both the airframe's and gimbal's axes have been observed as being nearly the same, the  ( Δ =  FlightYawDegree  -  GimbalYawDegree ) has been -25° or more.

Once the initial stereographic down (little planet) projected panorama has been exported from PTGui, the angle from its center to sol is measured in Photoshop; e.g., -111.9° then subtracting 90°, to produce the value in the column (below screenshot) labeled PTGuiAz; e.g., -201.9°. From its absolute value; e.g., 201.9° the calculated Solar Azimuth (SolAz) is subtracted; e.g., 196.8°, producing the PTGui yaw correction to be applied; e.g., 5.82°.

  

Here in Nerdvana, having a few southern hemisphere datasets to play with will help me better understand what to expect, specifically with algebraic signs in mind when south of the Equator.

Kind regards,

Kelly