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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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USING UTM

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Using utm

Steve Allen

KCSARA SAR Academy

April 2010

USING UTM


Objectives

Objectives

  • Understanding UTM system

  • Finding coordinates of a point

  • Plotting a point


Universal transverse mercator utm

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

To Describe a Location

  • Datum

  • Zone

  • Northing

  • Easting


Datums

Datums

  • NAD 27

    • Most older printed maps (Greentrails, USGS)

  • NAD 83 /WGS 84

    • 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


Map datum

Map Datum


United states utm zones

United States UTM Zones


State of washington utm zones

State of Washington UTM Zones


Identifying the grid

Identifying the grid

466

467

(Easting)

5157

5157

Map

5156

5156

(Northing)

466

467


Determining coordinates easting

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

LEFT (W) of your point

465

466


Determining coordinates easting1

Determining Coordinates: Easting


Determining coordinates easting2

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


Determining coordinates easting3

Determining Coordinates: Easting


Determining coordinates northing

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


Determining coordinates northing1

Determining Coordinates: Northing


Determining coordinates northing2

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


Determining coordinates northing3

Determining Coordinates: Northing


Final coordinates of

Final Coordinates of

465300E 5165800N

But we can go finer, if we use a template


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


Using a template

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


Another way to use the template

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

Determining Coordinates

489520E

5315440N

Start here.

489000E, 5315000N


Plotting points

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.


Plotting 490 120e 5315 340n

Start here. 490, 5315

Plotting 490120E 5315340N

490120E

5315340N


Questions

Questions?


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