usng us national grid. usng united states national grid lessons learned have taught us that...
TRANSCRIPT
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US NATIONAL GRIDUS NATIONAL GRID
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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
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USNGRIGHT
UP
0
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USNG0
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USNG0
RIGHTU
P
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10 UNITS
100 UNITS
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USNG0
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
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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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