Convert over 360 degree range of coordinates to +/-180 longitude range in R?

How to convert longitude from 0 360 to 180?

If you know for certain that your input longitudes range between 0 and 360 , then yes: just subtract 360 from values that are greater than (or equal to) 180 . This will gracefully handle any longitude value with no other logic required.
 

Are longitudes 180 or 360?

Longitude is measured by imaginary lines that run around Earth vertically (up and down) and meet at the North and South Poles. These lines are known as meridians. Each meridian measures one arc degree of longitude. The distance around Earth measures 360 degrees.
 

How do you convert coordinates into latitude and longitude?

Community Mapping Experiment: How to Convert Latitude and Longitude to Map Coordinates

1. Step 1: Multiply (×) the “degrees” by 60.
2. Step 2: Add (+) the “minutes”
3. Step 3: If the Latitude (Longitude) degrees are S (W) use a minus sign (“-“) in front.
4. Step 4: Subtract Reference Location converted to Minutes.

How do you convert negative longitude?

The method for converting S and W NMEA is the same as for N and E. You just need to make it negative. 7650.911,S,02814.310,W is -76°50’91,-28°14’31” where as 7650.911,N,02814.310,E would be 76°50’91,28°14’31” .
 

Why do we have 360 longitudes and only 180 latitudes?

The lines running North to South are called lines of longitude, while the lines running East to West are called lines of latitude. As we move East-West, we change through 360 degrees. In other words, the Earth is 360 degrees around. As we move North-South, we change through 180 degrees.

What is the 180 degree line of longitude?

the International Date Line

The meridian at 180° longitude is commonly known as the International Date Line. As you pass the International Date Line, you either add a day (going west) or subtract a day (going east.) The prime meridian and the International Date Line create a circle that divides Earth into the Eastern and Western Hemispheres.

Are there 360 degrees of longitude on Earth ranging from 180 W to 180 E?

There are 360 degrees of longitude (+180° eastward and −180° westward.). The longitude line of 0 degrees is known as the Prime Meridian and it divides the world into the Eastern Hemisphere and the Western Hemisphere.
 

How many longitudes are there 360?

The western most longitude is 180W and the eastern most longitude is 180E; incidentally, 180W and 180E are the same longitudes. This is called the 180th meridian and also the international date line. Therefore, the total number of latitudes is 180; and the total number of longitudes are 360.

Why is 180 degrees longitude not straight?

The IDL is at 180 degrees longitude, not because it is just opposite to prime meridian but because it passes majorly through the oceans. The IDL is intentionally made so that it doesn’t pass from any country’s landmass, and the problem of two different dates in one country does not arise.

How do you convert coordinates into angles?

Quote from video: So what you want to do is take the arc tan or the tan inverse of both sides.

Do lines of latitude run from 0 to 180 degrees?

Ecuador was named for the Equator, the 0-degree latitude line that also passes through 11 other countries. Latitude is the measurement of distance north or south of the Equator. It is measured with 180 imaginary lines that form circles around Earth east-west, parallel to the Equator. These lines are known as parallels.
 

How do you convert longitude to decimal degrees?

Decimal degrees = Degrees + (Minutes/60) + (Seconds/3600)

1. First, convert minutes and seconds to their degree equivalents and add the results. 25’/60 = 0.4167° 30″/3600 = .0083°
2. Then, add this number to the number of degrees. 39° + 0.425° = 39.425°
3. So, the final result is: 39° 25′ 30″ = 39.425°