ā07-14-2019 09:20 AM
dose anyone know the formula to draw the Spherical circle like below, thanks.
Solved! Go to Solution.
ā07-14-2019 03:40 PM
Do you know about spherical polar coordinates, as well as lines of longitude and latitude? If we call the Radius "R = 1", the Polar angle "Phi", and the Azimuth angle "Theta", a circle of Longitude at a fixed Theta (and R) is simply drawn by having Phi go from 0 to pi (assuming 0 is the North Pole), while a circle of Latitude fixes Phi and lets Theta go from 0 to 2 pi (this will, of course, draw around the back side of the Globe, but you can just draw the front half-sphere by letting Theta go from 0 to pi).
Note that this is a 3-D graph (which LabVIEW can produce). You can "do the math" and compute the equations for the 2D projection of the 3D plot, of course ...
Bob Schor
Bob Schor
ā07-15-2019 04:26 AM - edited ā07-15-2019 04:27 AM
There's a 2D polar plot in Graphics & Sound>Picture Plots...
That might not answer the question. Or actually it does imply a "yes" (yes, somebody knows the formula to draw the Spherical circle).
ā07-15-2019 05:22 AM
Your two grids are not the same, but look up "Wulff net" and "Schmidt net" to see which one is closer to your needs.
ā07-15-2019 08:04 AM
Dear altenbach,
Thanks for you reply, it seem like the Schmidt net after compare the graph, do you know how to draw it ?
thanks for your help in advance.
ā07-15-2019 09:26 AM
I have found the formula in the attached, I will try to draw this Schmidt net (equal-area projectionļ¼ć
ā07-26-2019 03:39 AM
I have finished this graph.
ā07-26-2019 03:48 AM
for the vi, please refer this link:
https://forums.ni.com/t5/LabVIEW/How-to-draw-the-ISOcandla-diagram-2D-sphere/m-p/3935627#M1118623