21
votes
What is this Sun and moon photographic anomaly?
The apparent anomaly, known as the Lunar Terminator or Moon Tilt Illusion, is indeed a matter of perspective. A brief explanation can be found here: http://chrisjones.id.au/MoonIllusion/
The essence: ...
- 211
13
votes
Accepted
Plotting wind barbs in python
Your uwnd variable holds 32 bit floats and has shape (1,73,144) corresponding to time, lat, lon and is located in the Dataset ...
- 14.1k
13
votes
Accepted
What is the formula used for atmospheric visibility?
I calculate surface visibility from WRF output using a calculation that I adapted from DTC's Unified Post Processor, specifically from their Fortran routine found in ...
- 4,983
8
votes
What is this Sun and moon photographic anomaly?
Here my wife holds a globe with the moon in view. I carefully processed in a bit-mode to find the curve of light on the globe and drew perpendicular lines. Plainly we can see that the moon-lite side ...
- 81
7
votes
Accepted
What kind of data is best shown in a rose diagram?
Rose diagrams, also called polar bar plots, are useful for showing azimuthal (directional) data. Any dataset consisting of lots of measurements of direction or orientation could be visualized this way....
- 11k
6
votes
Plotting the wind direction in 3D?
The context I often see the u,v,w components shown in one plot are forward and backward trajectory plots like those from the NOAA HYSPLIT Model, which provides separate panels for horizontal and ...
- 13.5k
5
votes
Plotting the wind direction in 3D?
Try quiver3 function in Matlab. For example, this is the example in Matlab's website for this function:
- 161
5
votes
Why is there a logarithmic grid on this plot?
It's a mistake.
You probably know this, but for anyone who's interested, these wireline logs are:
DRHO — density ('RHO') correction (delta, or 'D') in g/cc.
DPHI — porosity ('PHI') from density ('D')...
- 11k
5
votes
Accepted
Rainbow dynamics?
Short answer: the refraction of light is ultimately dependent on both temperature and exact composition of the medium (e.g., liquid water or ice) through which it passes. Note: strictly speaking, "...
- 1,144
5
votes
Is there a publicly accessible resource of video/image footage of the sky over an entire year?
It may be more than you want, and more terrain-focused, but UC San Diego's High Performance Wireless Research and Education Network (HPWREN) has an archive for each of dozens of fixed-angle Southern ...
- 3,474
4
votes
What is this Sun and moon photographic anomaly?
You can see this effect on the powerline above the railroad tracks in the picture you posted too, it doesn't look straight, even though it likely was in reality! The straight line between the sun and ...
- 1,989
3
votes
What is this Sun and moon photographic anomaly?
When looking at the sky, spherical coordinates are used as a convenience. We turn our head and body in azimuth and altitude to compare the position of objects. In this regards, the sky looks like a ...
- 262
3
votes
Websites providing visual weather data
For forecasting, there is a ton of data on the internet. Here are just a few sources.
A Penn State professor compiled a list of weather websites on a webpage
called National Weather Connections. I'd ...
- 8,684
2
votes
Accepted
How can I implement a visualization of archived convective data from numerical weather models?
The best model archive I know of offhand is Iowa State Meteorology's Gempak model data in their MTArchive. Looks like model-wise, they have at least 10 years of GFS (and the predecessor, the AVN). ...
- 8,713
2
votes
How to plot a Hovmoller diagram in MATLAB?
Here is an example using contourf. The trick is in sampling the 3D arrays appropriately:
...
- 15.4k
1
vote
What is this Sun and moon photographic anomaly?
Here is what you do. Look at the moon. See which way the sunlit face of the moon is pointing, not in a picture but in a real-life view of the moon. Using your own perception, trace a line ...
- 199
1
vote
Looking for fun and illuminating weather visualizations
Try VentuSky. An interactive map with different models and data visualization that can be adjusted easily.
- 1,064
1
vote
Accepted
Looking for fun and illuminating weather visualizations
Try Windy.com It looks very similar to the EarthWindMap, but appears to offer more controls. It is simple to change the heights and what variables are of interest.
- 13.5k
1
vote
Websites providing visual weather data
VentuSky:
Uses ICON, GFS, GEM (global) and HRRR (US) models with respective forecast times 4, 9, 9 and 2 days respectively. Map can be played as animation. Animation and weather map settings can be ...
1
vote
Plotting the wind direction in 3D?
How about using the same 2D wind rose plot for an additional figure, but color it with respect to velocity in the vertical? So you will have two of the similar looking wind rose plots, they will both ...
- 572
1
vote
What kind of data is best shown in a rose diagram?
In seismic acquisition and processing rose plots are essential. Another way to think of these plots is "angular histograms." This article article shows rose plots for a subsurface point using this ...
- 171
Only top scored, non community-wiki answers of a minimum length are eligible