structural collapse awareness u.s. national grid
TRANSCRIPT
Structural Collapse Awareness
U.S. National Grid
2
Structural Collapse Awareness
Objectives
In this lesson you will learn how to:
• Understand and read USNG coordinates
• Identify locations by usinggrid coordinates
• Relay grid coordinates in reference to a given location
3
Structural Collapse Awareness
Background
The USNG ensures a uniform grid mapping system across cities and counties in Florida and can be easily extended world-wide as a grid reference system.
Additional information about the USNG can be found at:
www.fgdc.gov/usng
4
Structural Collapse Awareness
Features of the USNGUSNG expands the utility of street and other mapsby adding the following commanding features:
• Provides a grid reference system that is seamless across jurisdictional boundaries
• Is the foundation for a universal map index• Describes point locations on appropriately gridded
paper and digital maps• Allows geo-positioning using Global Positioning
System (GPS) receivers• Supports World Wide Web map portals that link digital
maps and GPS data
5
Structural Collapse Awareness
Longitude and Latitude
Using longitude and latitude can be confusing because different agencies cite different coordinates to identify the same location.
All of the longitude and latitude coordinatesbelow describe the same location:
• DD -85.990151, 30.272240• DM -85 59.409089, 30.16.334386• DMS 85 59’24.545”W, 30 16’20.063”N
6
Structural Collapse Awareness
USNG Overlay
As a responder, you may be given a map or an aerial photograph of the response area with a USNG overlay.
7
Structural Collapse Awareness
USNG Coordinates
The first step in reading a USNG map is to understand the letters and numbers that makeup a grid coordinate.
8
Structural Collapse Awareness
Grid Zone Designation17R LL 573 918
The 17R is the Grid Zone Designation (GZD) for aworld-wide unique address.
9
Structural Collapse Awareness
Meter Square Identification17R LL 573 918
The LL is the 100,000 Meter Square Identification for regional areas.
10
Structural Collapse Awareness
Easting and NorthingGrid Coordinates
17R LL 573 918The numbers 573 918 are the Easting and Northing coordinates of a specific location.
11
Structural Collapse Awareness
Easting and NorthingNumber of Digits
The more digits used, the smaller the grid coordinates and the more accurate the location.
• 57323 91820 10 digits locates the area within a1 x 1 meter square
• 5732 9182 8 digits locates the area within a10 x 10 meter square
• 573 918 6 digits locates the area within a100 x 100 meter square
• 57 91 4 digits locates the area within a1000 x 1000 meter square
12
Structural Collapse Awareness
Knowledge Check
Given the coordinates 17R NN 17938 01505 what is the 100,000 Meter Square Identification for regional areas?
a.17R
b.17R NN
c.NN
d.17938 01505
13
Structural Collapse Awareness
Knowledge Check
You are responding to an area flooded by the storm surge during Hurricane Michael, and were given the coordinates 6612 5811. What size area will you be able to locate with these coordinates?
a.1 x 1 meters
b.10 x 10 meters
c.100 x 100 meters
d.1000 x 1000 meters
14
Structural Collapse Awareness
Area Identified with a USNG Coordinate
15
Structural Collapse Awareness
Knowledge Check
You are given the coordinates of a rescue team on-scene as 507 030. Find and mark this location on the map.
16
Structural Collapse Awareness
Knowledge Check (Answer)You are given the coordinates of a rescue team on-scene as 507 030. Find and mark this location on the map.
17
Structural Collapse Awareness
Identifying the Coordinatesof a Known Location
18
Structural Collapse Awareness
Knowledge Check
This map is labeled with points A and B. Identify the coordinates for the location of Point A, your location.
a. 572 914
b. 571 913
c. 913 571
d. 914 572
19
Structural Collapse Awareness
Knowledge Check (Answer)
This map is labeled with points A and B. Identify the coordinates for the location of Point A, your location.
a. 572 914
b. 571 913
c. 913 571
d. 914 572
20
Structural Collapse Awareness
Knowledge Check
A nearby rescue crew has located additional victims needing immediate attention. Your crew has been asked to report to the other crew’s location at Point B. Identify the coordinates in which you’ve been asked to report.
a.578 915b.578 921c.917 578d.577 917
21
Structural Collapse Awareness
Knowledge Check (Answer)
A nearby rescue crew has located additional victims needing immediate attention. Your crew has been asked to report to the other crew’s location at Point B. Identify the coordinates in which you’ve been asked to report.
a.578 915b.578 921c.917 578d.577 917
22
Structural Collapse Awareness
Summary
In this lesson, you have learned:
• Why the U.S. National Grid (USNG) was developed
• How to find a location withina devastated area if giventhe USNG coordinate
• How to read a USNG to find and relay the grid coordinate for a location