20 Flashcards
(85 cards)
1
Q
1:02 PM Sat May 31
A
2
Q
GE Reviewer
A
3
Q
V
A
4
Q
•••
A
5
Q
Open in Word
A
6
Q
= 22% 04
A
7
Q
@ Done
A
8
Q
Level line
A
9
Q
Is a line in a level surface.
A
10
Q
Horizontal line
A
11
Q
Is a straight line perpendicular to a vertical line.
A
12
Q
Bench Mark (BM)
A
13
Q
Is a permanent point of known elevation.
A
14
Q
Temporary Bench Mark (TBM)
A
15
Q
Is a semi permanent point of known elevation.
A
16
Q
Turning Po port emporarily use to ransfer elevations.
A
17
Q
Backsight (BS)
A
18
Q
Is a rod reading on a rod of known elevation in order to
A
19
Q
establish the instrument line of sight.
A
20
Q
Height of Instrument (HI)
A
21
Q
Is the elevation of the line of sight through the level.
A
22
Q
Foresight (FS)
A
23
Q
Is a rod reading taken on a turning point
A
benchmark
24
Q
temporary benchmark in order to determine its elevation.
A
25
Types of Meridian
26
True Meridian
27
Line passing through the poles
28
Magnetic Meridian
29
Lies parallel with the magnetic lines of force of the earth
30
Grid Meridian
31
Parallel to the central meridian of the system of plane
32
rectangular coordinates
33
Assumed Meridian
34
Line taken in convenience
35
Variation in Magnetic Declination
36
Daily Variation
37
Also called "solar-diurnal variation. It is a periodic swing
38
of the magnetic needle occurring each day.
39
A mal Manativing distinct from the scular variation.
40
Secular Variation
41
the Earth's magne
medial
42
Irregular Variations
43
Uncertain and cannot be predicted
most likely to occur in
44
sun spot'
and auroral display
45
Isogonic
46
Lines connecting points of same magnetic declination
47
Agonic
48
Lines connecting points of zero magnetic declination
49
Local Attraction
50
Is any deviation of the magnetic needle of a compass from
51
its normal pointing towards magnetic north. Caused by iron deposits
52
current fluctuations. or any objects made of steel and iron.
53
Isoclinic
54
A line connecting points of same magnetic dip
55
Some of the Modern Positioning System
56
Consists of specially designed short-to-medium range
57
Inertial Positioning System (IPS)
58
Doppler Posinim system CuPS
59
Global Poisoning Syste constellaion of saelics in providing
60
an exact position of a point.
61
Errors in GPS
62
Satellite Error
63
due to the clock model of the satellites and the orbital
64
uncertainties of the satellites.
65
Observation To the fact that signals of the satellies are being
66
transmitted via radio waves.
67
since receivers are instruments
they are subject to errors
68
too like the instruments being used in surveying.
69
Multipath Error
70
obstruction
thus multipath error are being introduced.
71
Dilution of Precision (DOP)
72
in GPS
this is an indicator as to the geometrical strength of
73
the satellites being tracked at the time of measurement.
74
Geometrical
75
degradation in poti and time i Progs here
is accuracy
76
Positional Dilution of Precision
gives accuracy
77
degradation in 3D position (lat
long
78
HDOP
79
Horizontal Dilution of Precision
gives
80
accuracy
81
degradation in horizontal measurements (lat
long).
82
VDOP
83
Vertical Dilution of Precision
gives accuracy degradation
84
in vertical measurements (height).
85
DEINON OPIN
