Transcript US National Grid - FloridaDisaster.org

US 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…
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–
–
–
Latitude/Longitude
Township/Range/Section
Street Address and Zip
UTM
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Latitude/Longitude
• Multiple formats are confusing
DD
DM
DMS
-85.990151, 30.272240
-85 59.409089, 30.16.334386
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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UP
RIGHT
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UP
0
RIGHT
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0
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RIGHT
UP
0
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100 UNITS
0
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10 UNITS
RIGHT
UP
0
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Review
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Grid Zone
100,000m
4 digit = 1,000m
6 digit = 100m
8 digit = 10m
17R
17R NJ
17R NJ 72 65
17R NJ 726 657
17R NJ 7262 6578
• RIGHT (Easting) - UP (Northing)
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Practical Exercise
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Building at grid:
145 100
Read right, and up.
Ex 1
ppt
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Building at grid:
1282 1122
Ex 1
ppt
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Building at grid:
1210 1109
Read right, and up.
Ex 2
ppt
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Road Intersection
at grid: 1318 0978
Read right, and up.
Ex 3
ppt
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Building at grid:
1448 0992
Read right, and up.
Ex 4
ppt
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Building at grid:
1215 0924
Ex 5
ppt
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Practical Exercise
(Camp Blanding Map)
• Locate the 8 digit coordinate for the 7
points on your map
30
1.
2.
3.
4.
5.
6.
7.
17R MP 05361516
17R MP 04521665
17R MP 04731701
17R MP 05211585
17R MP 05401551
17R MP 06321356
17R MP 04821445
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