Map Reading and Terrain Analysis Flashcards
A ___ is a graphic representation, drawn to scale, of a portion of the earth’s surface as seen from above.
map
___is found in 2 places: upper center margin and lower margin side. Taken from most outstanding feature within map.
sheet name
The ___ is found in upper right and lower left margins and identifies this map sheet from all other map sheets.
sheet number
The ___ is found in upper right and lower left margins and is a sequence reference expressed as four-digit number.
series number
___ tells you what map sheet you would need to navigate in an area adjacent to the area covered by this map sheet.
adjoining sheets
A ___ is a statement of general information that relates to the mapped area, usually in lower right margin.
special note
The ___ shows the angular differences between true north, grid north, and magnetic north.
declination diagram
numbers, such as 1:50,000, meaning 1 unit on map is 50,000 units in real world.
scale
__ are used to convert map distance to ground distance and vice versa
bar scales
___ is the vertical distance between contour lines with a unit of measurement usually in feet or meters
contour intervals
___ identifies the grid zone designation, and contains the 100,000 meter square identification.
grid reference box
___ tells what the colors and symbols stand for on this map.
legend
the map dictionary
glossary
what color indicates cultural man-made features, such as buildings and roads?
black
what color identifies hydrography or water features such as lakes and rivers?
blue
what color identifies all relief features and elevation, such as contour lines on older nonred-light readable maps?
brown
what color identifies vegetation?
green
what color classifies cultural features, such as populated areas, main roads, and boundaries on older maps?
red
combined color to identify cultural features, relief features, non-surveyed spot elevations
red-brown
a line of high ground from which a total of 10 natural or man-made terrain features are classified.
ridgeline
5 MAJOR terrain features:
- Hill
- Saddle- lower point between hilltops
- Valley
- Ridge
- Depression- closed contour lines with tick marks pointing toward low ground
3 MINOR terrain features:
- Draw- gaps
- Spur- fingers
- Cliff- contour lines come together
2 SUPPLEMENTARY terrain features:
- Cut- ticks point toward road
2. Fill- ticks point away from road
MGRS (map)
Military Grid Reference System
UTM Grid (map)
Universal Traverse Mercator Grid
UTM Grid is divided into ___ N-S zones, each ___ degrees wide.
60, 6
How accurate is: 4 digit? 6 digit? 8 digit? 10 digit?
4=1000 m
6=100 m
8=10 m
10=1 m
4 ___ are located at the bottom of the map: measurements are in ___, ___ and ___
bar scales
meters, statute miles, nautical miles
2 types of distances (maps)
- straight-line (on map)
2. road (convoys and road marches)
___ is defined as a horizontal angle measured clockwise from a base direction (North)
azimuth
3 base directions of North:
- True North- ends in star
- Grid North
- Magnetic North- ends in half arrowhead
___ is used to locate an unknown point by occupying at least two or three known positions on the ground and then map sighting on the unknown location.
Intersection
___ is the method of locating one’s position on a map by determining the grid azimuth to at least two well-defined locations that can be pinpointed on the map
Resection, modified resection
2 methods to determine a magnetic azimuth:
compass to cheek
center hold
