USING UTM

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# USING UTM - PowerPoint PPT Presentation

Steve Allen KCSARA SAR Academy April 2010. USING UTM. Objectives. Understanding UTM system Finding coordinates of a point Plotting a point. Metric units (meters) World is split into 60, 6º degree zones Seattle area is Zone 10N

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Presentation Transcript
Steve Allen

April 2010

USING UTM
Objectives
• Understanding UTM system
• Finding coordinates of a point
• Plotting a point
Metric units (meters)

World is split into 60, 6º degree zones

Seattle area is Zone 10N

Distorted above North 84º, and South 80º, not applied above these latitudes.

Smallest grid unit on USGS 1:24000 maps is 1 km. May be different on different scale maps!

Coordinates get larger going east (easting) from the zone meridian and larger going north (northing) from the equator.

Universal Transverse Mercator (UTM)
To Describe a Location
• Datum
• Zone
• Northing
• Easting
Datums
• Most older printed maps (Greentrails, USGS)
• Coordinates from aircraft
• Coordinates from 911 dispatcher
• Default new GPS unit “out of the box”
• NAD 83 and WGS 84 are virtually the same for our purposes
Identifying the grid

466

467

(Easting)

5157

5157

Map

5156

5156

(Northing)

466

467

5157

5156

Determining Coordinates: Easting

Determine the easting first:

From the object on map ( ) go

to the bottom (or top) edge of the map

Find the nearest smaller coordinate to the

465

466

Determining Coordinates: Easting

Divide the distance between the coordinate to

the left of your point and the coordinate to the right of your point into tenths

3tenths

This is hundreds of meters

465

466

5156

5157

466

465

Determining Coordinates: Northing

From the point on map ( ) look to the left (or right) edge of the map

Find the nearest coordinate below (S) of your point

5157

5156

Determining Coordinates: Northing

Count or estimate the number of tenths from the coordinate BELOW your point TO the corner.

This is hundreds of meters

8Tenths

Final Coordinates of

465300E 5165800N

But we can go finer, if we use a template

Template
• Must match map scale!
• 1:24,000 (USGS, 7.5 min, 1 in = 2000 feet)
• 1:25,000 (USGS, 15 min, 1 cm = 0.25 km)
• 1:63,360 (USGS, 15 min, 1 in = 1 mile)
• 1:69,500 (Greentrails, 15 min)

Warning - Photocopied map or map printed from “Topo” may have an odd scale

Starting corner:

465000E 5165000N

Template placed on map at kilometer grid corner

Using a Template
• Can estimate how far into box on a scale of 1 to 10 to find nearest ten meters.

5165820N

465360E

Starting corner:

465000E 5165000N

Another Way to Use the Template
• Put the 0 corner of the template on the point.
• Read where the block margin hits the template scales.

465360E

5165820N

Determining Coordinates

489520E

5315440N

Start here.

489000E, 5315000N

Plotting Points
• Underline the last 3 digits of each coordinate.
• What’s not underlined are the margin coordinates.

Example: 490120E 5315340N

Use template to determine position within the kilometer box.