us national grid

USNG

US NATIONAL GRIDUS NATIONAL GRID

USNG

United States National Grid

• Lessons learned have taught us that standardized grids are needed for positional reporting.

• As far back as Hurricane Andrew, problems were recognized for emergency managers...

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What’s wrong with current systems?

• We already have…

– Latitude/Longitude

– Township/Range/Section

– Street Address and Zip

– UTM

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Latitude/Longitude• Multiple formats are confusing

DD -85.990151, 30.272240

DM -85 59.409089, 30.16.334386

DMS 85 59’24.545”W, 3020.063”N

All the same location!!!

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How far is a second anyway?

• What is the distance from….

85 59’24.545”W, 30 16’20.063”N

• To here….85 59’26.292”W, 30 16’14.546”N

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Worse yet…

• What is the distance from-85.990443, 30.275358

• To here….85 59.364547, 30 16.504539

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Township/Range/Section• Township/Range/Section grid from

the Public Lands Survey System is an important and good system…

– basis of land ownership records

– been in use for over 180 years

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Township/Range/Section• But a perfect section really doesn’t exist

– irregular in coastal areas – too large to meet needs of ground crews

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Street Address and Zip

• Problematic due to…– rural routes

– post office boxes

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• What do you do when the SIGNS are gone?

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• What do you do when the ROADS are gone?

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RIGHT

UP

USNGRIGHT

UP

0

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RIGHTU

P

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10 UNITS

100 UNITS

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RIGHTU

P

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Review

• Grid Zone 17R

• 100,000m 17R NJ

• 4 digit = 1,000m 17R NJ 72 65

• 6 digit = 100m 17R NJ 726 657

• 8 digit = 10m 17R NJ 7262 6578

• RIGHT (Easting) - UP (Northing)

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Practical Exercise

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ppt

Building at grid:145 100

Ex 1

Read right, and up.

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ppt

Building at grid:1282 1122

Ex 1

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ppt

Building at grid:1210 1109

Ex 2

Read right, and up.

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ppt

Road Intersection at grid: 1318 0978

Ex 3

Read right, and up.

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ppt

Building at grid:1448 0992

Ex 4

Read right, and up.

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ppt

Building at grid:1215 0924

Ex 5

Practical Exercise(Camp Blanding Map)

30

• Locate the 8 digit coordinate for the 7 points on your map

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1. 17R MP 05361516

2. 17R MP 04521665

3. 17R MP 04731701

4. 17R MP 05211585

5. 17R MP 05401551

6. 17R MP 06321356

7. 17R MP 04821445

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