# Tag Info

Accepted

### How can a starting point south of the north pole to an endpoint north of the south pole be halfway around the world?

I think you are too into the numbers. When talking about longitude and latitude they are two different things. Longitude goes east and west from a point on the earth from 0 to 180 degrees east and ...

### Is there a meridian that only passes through water (excl. continental Antarctica)?

Is there a meridian that only passes through water (excl. continental Antarctica)? No. Note: All longitude spans in this answer are from easternmost point to westernmost point. The mainland of Africa+...
• 23.1k
Accepted

### Is the representation of Earth oriented correctly in this image?

The way "I see the diagram" it looks weird, but it is probably correct. My perception is that it is about frames of reference. We are used to seeing the Earth with Earth's north at the top, not at 23....
• 24.6k

### How can a starting point south of the north pole to an endpoint north of the south pole be halfway around the world?

There is a site that will show you the antipode for any location, and takes you through the calculation if you need it - https://www.geodatos.net/en/antipodes/united-states/monterey. Looking at the ...
• 2,010

### Is there a meridian that only passes through water (excl. continental Antarctica)?

The answer is no. In the Atlantic Ocean any meridian that would avoid South America and Africa would pass over Greenland. In the Pacific Ocean, St Lawrence Island, just to the south of the Bering ...
• 24.6k

### How large is the area covered by coordinates XX°YY'ZZ"N/XX°YY'ZZ"E?

As others have said, a single set of coordinates gives a point rather than an area. However, I assume that the intent of the question is an understanding of the precision of these coordinates - i.e. ...
• 5,800
Accepted

### Do I understand pressure coordinates in the right way?

In pressure coordinates it is common to use $\omega$ as the vertical velocity component instead of $w$ as in cartesian coordinates. Obtaining the velocity components in the pressure coordinate system:...
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### How large is the area covered by coordinates XX°YY'ZZ"N/XX°YY'ZZ"E?

A point do not have an area. A point is a 0-dimensional mathematical object which can be specified in n-dimensional space using an n-tuple (x1, x2, ..., xn) consisting of n coordinates. The area ...
• 2,633

### How can a starting point south of the north pole to an endpoint north of the south pole be halfway around the world?

You can travel in north-south direction to go around the world... but you can also travel east-west. Going around the equator halfway will see no north-south change, but still be halfway around the ...
• 8,713

### How can a starting point south of the north pole to an endpoint north of the south pole be halfway around the world?

It all depends on exactly what you mean by "halfway around the earth heading due north or south." One theoretical interpretation of that phrase is that, starting in Monterey, California, you ...
• 131
Accepted

### Maximum and minimum integer number of latitude and longitude

Latitude is easy: -90 to +90. Longitude can use one of two conventions: 0 to +360, or -180 to +180. You may want to handle both gracefully.
• 5,800

### How can a starting point south of the north pole to an endpoint north of the south pole be halfway around the world?

It's easy to get confused by great circle distances when looking at a flat map. I find it much easier to understand the concept while looking at a globe, or if I don't have any, on Google Earth. The ...
• 558
1 vote

### How to find out if three points on Earth are on the same great circle arc?

I would take the same approach as Jean-Marie Prival, but using a different toolset, because I'm not familiar with GIS in general and have never been in a room that has ever seen Mathematica. But I do ...
1 vote
Accepted

### What is the vertical offset of geopotential height from ellipsoidal height in GFS?

I have found the answer Geopotential height of ground or water surface is available as a variable (UCAR variable inventory). It is called 'orography' if you read the file with cfgrib. Somehow it did ...
• 21
1 vote

### Difficulty interpolating near poles using lat/lons

$\color{blue}{\text{The answer here presumes that Earth is a sphere.}}$ $\color{blue}{\text{This is not fully true, but the question seems to build in that assumption.}}$ \$\color{blue}{\text{That ...
• 3,666
1 vote

### How to calculate 'real-world' geometric height from ERA reanalysis data

I have two solutions. Use MetPy to calculate the height from the geopotential height. Use the hypsometric equation, averaging the temperature below the level.
• 8,684
1 vote

### How to calculate 'real-world' geometric height from ERA reanalysis data

If I understood the question right: CDO can interpolate from model level to height level with the operator ml2hl infile.nc outfile.nc additionally, for the lower atmospheric levels, you can add an ...
• 215
1 vote

### Is the representation of Earth oriented correctly in this image?

As I see it, the Earth is well oriented, but due to (over)simplification the drawing of the geographical features may be misleading. The aspects that show that the North Pole is not upwards but tilted ...
• 829

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