us national grid
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US NATIONAL GRID. 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. What’s wrong with current systems?. We already have… - PowerPoint PPT PresentationTRANSCRIPT
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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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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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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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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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