What is a coordinate system and why is it so important
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What is a coordinate system and why is it so important?. Or Why is my school map showing up somewhere in the Gulf of Mexico?. This should be. Here.

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What is a coordinate system and why is it so important?

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What is a coordinate system and why is it so important

What is a coordinate system and why is it so important?

Or

Why is my school map showing up somewhere in the Gulf of Mexico?


What is a coordinate system and why is it so important

This should be

Here.

Ever have this happen? You bring in a map of your state, try to overlay your city map and they just don’t match up? Maybe your map view comes up looking something like this one.


What is a coordinate system and why is it so important

If your data is not overlaying properly, its most likely due to data that is stored in two different coordinate systems.

So back to our first question, what is a coordinate system? If you have had a class in Algebra or Geometry, this figure to the right will look familiar.


What is a coordinate system and why is it so important

Not all coordinate systems are alike. The two most common coordinate systems used by EAST students are the

Universal Transverse Mercator (UTM) and the

Geographic coordinate systems.


What is a coordinate system and why is it so important

(-x, +y)

(West, North)

(+x, +y)

(East, North)

Equator: X

(-x, -y)

(West, North)

(+x, -y)

(East, South)

Prime Meridian: Y

Y

X

Prime Meridian

Prime Meridian

Equator

Equator

The intersection of the Prime Meridian and the Equator form the axes of the geographic coordinate system.

“Flatten out” the axes and the coordinate plane is like the one to the right.

Longitude is the X coordinate. Latitude is the Y coordinate.


What is a coordinate system and why is it so important

(-x, +y)

(West, North)

(+x, +y)

(East, North)

Equator: X

(-x, -y)

(West, North)

(+x, -y)

(East, South)

Prime Meridian: Y

Geographic coordinates may be written in one of the following ways:

Degrees, Minutes, and Seconds (DMS) Example

Little Rock, Arkansas

X = Longitude: 92 degrees W 45’ 33”

Y = Latitude: 34 degrees N 32’ 52”

Decimal Degrees: Example

X = -92.2579 Y = 34.834


What is a coordinate system and why is it so important

The UTM coordinate system uses a “flat earth,” model and is divided up into the zones as shown below.

The X axis is the Equator, and there is a different Y axis for each zone.


What is a coordinate system and why is it so important

This map illustrates the UTM zone 15 North. The UTM coordinate system uses only one quadrant.

Rather than using degrees, minutes, and seconds to measure distance from the axes, the UTM system is measured in Meters.

The UTM coordinates Little Rock, Arkansas are:

X= 559,713.08 Meters East

Y= 3,843,632.12 Meters North


What is a coordinate system and why is it so important

Even though the following sets of coordinate pairs represent the same geographic location, notice how different the numbers are.

X = -92.2579 Y = 34.834

X= 559,713.08

Meters East

Y= 3,843,632.12

Meters North

If you tried to place features stored in two different coordinate systems in the same map you might end up with something like this.

Little Rock


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