問題一覧
1
what are the two types of measurements in surveying?
Directly and Indirectly
2
a type of measurement which is the comparison of the measured quantity with a standard measuring units.
Direct Measurements
3
a type of measurement which the observed value is determined by its relationship to some other known values.
Indirect Measurements
4
it is the process of determining the extent size or dimensions of a particular quantity in comparison to a given standard
Measurement
5
measurements are usually concerned on:
angles elevations times lines areas volume
6
__________ are never exact and they will always be imperfect no matter how carefully made
Measurements
7
It is commonly known as the metric system world's most widely used.
International System of Units
8
What are the 4 unit systems in various field applications?
circular or natural system, sexagesimal system, centesimal system, military system
9
SI unit for angles measured in radiance
circular or natural system
10
english unit system for angles which is measured in terms of degrees
sexagesimal system
11
the angle measured in terms of grades. in this system a right angle is divided into 100 grades therefore one revolution is equal to 400 grades
centesimal system
12
a unit system where the fundamental units is the mil where by definition 1600 miles = 1 right angle does one circular revolution is equal to 6,400 miles
military system
13
summarize the representation for angles in one relationship based on single revolution.
1 revolution=2πrads=360°=400(g)=6400mils
14
it is the difference between the true value and the actual measured value of a quantity.
errors
15
mistakes are also called as ______.
blunders
16
it is also called as blunders are in accuracy in measurements usually due to carelessness, poor judgment, improper execution, and miscommunication
mistakes
17
they are the largest of the errors likely to arise
mistakes
18
name the 5 types of errors
systematic error random error natural error instrumental error personal error
19
an error also known as biases. it can be constant or variable throughout an operation
systematic error
20
an error which is purely accidental in character
random error
21
an error caused by variations in the phenomena or nature
natural error
22
an error due to imperfections, constructions and improper adjustments
instrumental error
23
an error caused by inability of the individual to make exact observations due to the limit of human sight.
personal error
24
systematic error is also known as ______.
biases
25
it indicates how close a given measurement is
accuracy
26
it refers to the degree of consistency of a group of observations
precision
27
by mathematical definition, it is the number of favorable events divided by total number of events
probability
28
it is the mean of an infinite number of observations.
most probable value (mpv)
29
it is a set of data refers to the quantity which has more chances of being true than any other available data.
most probable value (mpv)
30
if we have a group of repeated measurements performed under similar conditions then the mpv is the ________ or the average of all the measurements.
arithmetic mean
31
it is also called as deviation it is the difference between the MPV in any observed quantity
residual
32
residual is also called as ______.
deviation
33
it is a measure of the amount of variation or dispersion on a set of data in relation to its mean.
standard deviation (sx)
34
what do you measure in a standard deviation?
variation or dispersion on a set of data
35
it is equal to the square or the standard deviation.
variance (sx²)
36
_________ and _______ are used to measure the variability or dispersion on a set of data but their units differ.
standard deviation and variance