CARA MENGUBAH KOORDINAT DMS KE DD

Summary

This video tutorial demonstrates how to convert coordinates from Degrees, Minutes, and Seconds (DMS) into Decimal Degrees (DD). Using an example of coordinates in Indonesia, the process involves dividing minutes by 60 and seconds by 3600, then adding them to the degree value. The tutorial also explains how to determine directional values (North/South, East/West) based on the converted coordinates using a Cartesian coordinate system. This step-by-step guide is ideal for understanding coordinate conversions for mapping and navigation purposes.

Takeaways

• 😀 Convert coordinates from DMS (Degrees, Minutes, Seconds) to Decimal Degrees by using the formula: DD = Degrees + (Minutes / 60) + (Seconds / 3600).
• 😀 One example is converting the DMS value 5° 50' 50" into decimal format, which results in 5.8472°.
• 😀 To convert, divide minutes by 60 and seconds by 3600, and then sum all the values (degrees, minutes, seconds).
• 😀 The formula also applies to other coordinates; for example, converting 104° 00' 00" results in 104.0000°.
• 😀 After calculating decimal degrees, remember to adjust for cardinal directions: negative for South (latitude) and West (longitude), positive for North (latitude) and East (longitude).
• 😀 The Cartesian diagram method is used to visualize the location and determine whether coordinates are in the Northern or Southern Hemispheres (latitude) or Eastern or Western Hemispheres (longitude).
• 😀 Latitude below the equator (South) and longitude to the West of the Prime Meridian (West) are considered negative.
• 😀 For North and East, coordinates are positive. The signs of coordinates depend on the hemisphere they fall into on the globe.
• 😀 The calculated coordinate for 5° 50' 50" S and 104° 00' 00" E would be -5.8472° and 104.0000°, respectively.
• 😀 This process of converting DMS to DD and determining cardinal directions is applicable for mapping and navigation purposes.

Q & A

What is the main topic of the video?

The main topic of the video is converting coordinates from DMS (Degrees, Minutes, Seconds) format to decimal degrees and understanding how to determine the appropriate North/South and East/West values for a location.

How do you convert from DMS to decimal degrees?

To convert from DMS to decimal degrees, you keep the degree value as it is, divide the minutes by 60 to get a fraction, and divide the seconds by 3600 to get another fraction. Then, sum the three parts together.

What does the symbol ' in the coordinates represent?

The symbol ' represents minutes in the DMS coordinate system. One degree is divided into 60 minutes, and each minute is represented by this symbol.

What does the symbol '' in the coordinates represent?

The symbol '' represents seconds in the DMS coordinate system. One minute is divided into 60 seconds, and each second is represented by this symbol.

What is the significance of dividing minutes by 60 and seconds by 3600?

Dividing minutes by 60 converts them into a fractional part of a degree, and dividing seconds by 3600 does the same for seconds. This is necessary for converting DMS coordinates into decimal degrees.

How do you determine if the value for latitude or longitude is positive or negative?

The sign (positive or negative) is determined by the hemisphere in which the point lies. Latitude values are positive if in the Northern Hemisphere and negative if in the Southern Hemisphere. Longitude values are positive if in the Eastern Hemisphere and negative if in the Western Hemisphere.

How is the Cartesian coordinate system applied to geographical coordinates?

The Cartesian coordinate system divides the Earth into quadrants using lines of latitude (North/South) and longitude (East/West). The coordinates are then plotted on this grid, with the signs indicating which quadrant the location falls into.

What is the result of converting 5° 50' 50" into decimal degrees?

Converting 5° 50' 50" into decimal degrees yields approximately 5.8472°. This is calculated by adding the degree, minutes converted into a fraction, and seconds converted into a fraction.

Why is the latitude value negative when it's in the Southern Hemisphere?

The latitude value is negative in the Southern Hemisphere because the system uses positive values for locations in the Northern Hemisphere and negative values for locations south of the equator.

Can you explain how to assign the North/South and East/West values for coordinates?

To assign the North/South and East/West values, plot the coordinates on the Earth’s grid. If the latitude is north of the equator, it’s positive (North); if south, it’s negative (South). Similarly, if the longitude is east of the Prime Meridian, it’s positive (East); if west, it’s negative (West).