b m o c using utm, mgrs & usng monica spicker some slides adapted from harry frank 2008
TRANSCRIPT
B M O C
Universal Transverse Mercator (UTM)
NATO system Metric units (meters) World is split into 60, 6º degree zones Spokane area is Zone 11N Distorted above North 84º, and South 80º,
not applied above these latitudes. Smallest grid unit on USGS 1:24000 maps
is 1 km. May be different on different scale maps!
Coordinates get larger going east (easting) from the zone meridian and larger going north (northing) from the equator.
B M O C
Determining Coordinates: Easting
465 466
5157
5156
Determine the easting first:From the object on map ( ) go
to the bottom (or top) edge of the map
Find the nearest smaller coordinate to the LEFT (W) of your point
B M O C
Determining Coordinates: EastingDivide the distance between the coordinate to the left of your point and the coordinate to the right of your point into tenths
465 466
3 tenths This is hundreds of meters
B M O C
Determining Coordinates: Northing
465 466
5157
5156
From the point on map ( ) look to the left (or right) edge of the map
Find the nearest coordinate below (S) of your point
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Determining Coordinates: Northing
Count or estimate the number of tenths from the coordinate BELOW your point TO the corner.
5157
8 Tenths This is hundreds of meters
5156
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Using a Template
Must match map scale! Can estimate how far into box on a scale of 1
to 10 to find nearest ten meters.
465360E
5165820N
Starting corner:465000E 5165000N
Template placed on map at kilometer grid corner
B M O C
Another Way to Use the Template
Put the 0 corner of the template on the point.
Read where the block margin hits the template scales.
465360E
5165820N
Starting corner:465000E 5165000N
B M O C
Plotting Points
Underline the last 3 digits of each coordinate.
What’s not underlined are the margin coordinates.
Example: 490150E 5315325N
Use template to determine position within the kilometer box.
B M O C
MGRS and USNG Military Grid Reference System US National Grid System USNG and MGRS are identical Based on UTM Default datum is NAD83 Includes
UTM zone (number and letter)A two letter grid designator that replaces
the smaller written UTM number in the margin
only the ending 5 numbers. More can be truncated, if you are not going down to single meters.
Most GPS support MGRS. Most commercial maps do NOT.