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Map & Air Photo

Test 2

QuestionAnswer
helps with location on maps tick marks
lines don't change, the value of the line changes Topo-Aid
shows things in their proper location planimetric
shows topography and elevation; does not have to be planimetrically accurate topographic maps
another word for "starting point" or "zero;" normally mean sea level datum
the difference between the highest and lowest point in a given area relief
lines that show diogramatically, what the landscape looks like; thicker the line, steeper the slope; spacing shows steepness of slope hachures
artistic rendering of elevation using hachures physiographic diagram
shading certain areas that would be in shadow if there were a light source in the northeast shaded relief
taking ranges of elevation, you give certain areas a different color hypsometric tint
a 3D version of a topographic map with higher elevations standing high and lower elevations low plastic relief model
lines of equal or constant elevation contour lines
hill bends inward concave
hill bends outward convex
smaller ridge that comes out from the main one spur
How do contour lines behave around streams? They form a V that points upstream.
the number of feet between adjacent contour lines contour interval
What are straight lines on maps usually mean? There's a man-made structure or a fault.
have half the value of regular contour lines supplementary contours
every so often a contour line is thicker; makes it easier to read the lines index contour lines
there will be a physical object in the ground if the number on the map is vertical; if the number is italicized, there is not an object spot elevation
objects in the ground, placed there by surveyors to mark a certain position recoverable marks
What happens when you cross the same contour line twice or two contour lines of equal elevation? you change direction (i.e. up/down)
where the ground has been raised to make a road fill
where the ground has been removed to make a road cut
vertical scale is stretched; not equivalent to horizontal vertical exaggeration
horizontal, clock-wise angle, measured from the north (true or magnetic) azimuth
direction/placement of a certain azimuth bearing
from the object to me, instead of me to the object; same as going in the opposite direction back azimuth
the angular difference between north and magnetic north; will change as magnetic north changes magnetic declination
lines of equal magnetic declination isogonic lines
lines with no magnetic declination agonic lines
instrument that finds slope angle clinometer
cylindrical system, based on the cylinder being placed transversely around the globe Universal Transverse Mercator Grid System
Which is given first? northing or easting? easting
city limits are further out than the buildings overbounded town
buildings exceed the city limits underbounded town
oceanic maps Bathymetric maps
the figure 8 found on a globe; vertical distance shows distance the perpendicular rays of the sun come in; width shows how "fast" the sun appears to be moving analemma
uses the back azimuth of things you can see to determine your location resection
using azimuths to place an object not on the map intersection
unknown accuracy; shown to left; act of plotting points using only a compass and a system of measuring distance open compass traverse
act of plotting points using only a compass and a system of measuring distance; comes back to the original point; reveals errors closed compass traverse
two steps, or every time the same foot hits the ground pace
measure the distance between two points as accurately as possible; measure it a number of times and take average; site on third point and measure that multiple times; done over and over again across the country triangulation
center "node" of multiple triangles; a known location, so very accurate triangulation station
two towers, built one inside the other; aids in triangulation Bilby Tower
method of accurately measuring elevation leveling
Created by: stoniertk28
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