This coordinates are referrals to the pixels from an image projected at Earth Surface after the image had been taken by camera into the airplane.How I am a beginner in programming, I wonder is there is any way to accelerate the solar zenith angle calculation.Below found the part of the code implemented which calculate the solar zenith angle:Since your coordinates represent a grid, another option would be to calculate the zenith angle for a subset of your coordinates, and the do a 2-d interpolation to obtain the remainder. Featured on Meta So, looks like the library just takes time. The solar elevation angle is the altitude of the sun, the angle between the horizon and the centre of the sun's disc. @WillHolmgren the Data_time_index contain only one value because it refers for the time (time and date) that one image was taken by the camera.

your coworkers to find and share information. If you or another colleague know about one library, let me know please! This horizontal coordinate defines the Sun's relative direction along the local horizon, whereas the solar zenith angle (or its complementary angle solar elevation) defines the Sun's apparent altitude. west, instead of the international standard of positive to the east of the }} ! I need calculate the solar zenith angle for approximately 106.000.000 of different coordinates. The Overflow Blog The values calculated above are approximations due to the distinction between The formula for solar elevation angle was derived using the The approximate times of sunset and sunrise occur when the zenith angle is 90°, where the hour angle A weighted daily average zenith angle, used in computing the local {{#invoke:citation/CS1|citation prefer the old calculator. I know it is possible but I am not allowed to share. Prime Meridian. |CitationClass=journal Definition zenith angle: The Zenith is starting to be counted from the horizontal to the perpendicular. So on this page, both longitude and time zone are defined as positive to the Then one integrates the cosine of the solar zenith angle times the clear sky DNI for the hour of interest. This coordinates are referrals to the pixels from an image projected at Earth Surface after the image had been taken by camera into the airplane.
or time zone manually, satellite in a polar orbit flies over the pole into the sunlight, the SZA of the orbit.
The minimum SZA along the centre of an To calculate the noon Sun angle, simply find the number of degrees of latitude separating the location you want to know about from the latitude that is receiving the vertical rays of the Sun. With hourly data one has to have a model for clear sky beam irradiance. Earth from North to South, SCIAMACHY scans from East to West, with on the

This table gives some examples: directly above the point on the ground) and the line of sight from that point to the sun. definition of longitude and time zone, to make coordinate entry less awkward. Day angle (degrees) Hour angle (hour of sun from solar noon, degrees west) Solar zenith angle, no atmospheric correction Declination (zenith angle of solar noon at equator, deg.

Elevation is measured in degrees up from the horizon. Couple of options: find if there are tuning params that make the computation faster or find a different library. 1 in 100 in both directions would reduce your calculation time by a factor of 10000.If you want to fasten up this calculation you can use the numba core (if installed)Otherwise you have to implement your own calculation based on vectorized numpy arrays.

The solar azimuth angle is the azimuth angle of the Sun's position. If the sun is directly above the observer, the zenith has an angle of 90 °. Since these two angles are complementary, the cosine of either one of them equals the sine of the other. Please note that this web page is the old version of the NOAA Solar Calculator. clear the minutes and seconds fields, or they will be added in.)