2017

Question 1

During the 1960-1980 period, the basic framework of the triangulation network of the Philippines was maintained by the _____ with ______ accuracy level

Answer 1

Bureau of Coast and Geodetic Survey, 1st order

Question 2

If a GPS receiver readout displays a height of = +36.05 meters and the geoid undulation, N is equal to +25.73 meters, calculate the orthometric height, H, in meters, of the point.

Answer 2

10.32

Question 3

Triangulation baseline were measured accurately and carefully using _____ in alloy which is highly resistant to change in length causes changes in ______.

Answer 3

invar, temperature

Question 4

Geoid _____ is the distance between the ellipsoid and the geoid at a given ______.

Answer 4

Separation, point

Question 5

GNSS satellites have _____ clocks

Answer 5

atomic

Question 6

Bench marks are relatively _______ objects, natural or bearing marked points, whose ______ above or below an adopted

Answer 6

Permanent, elevation

Question 7

Orthometric height is generally presented as a mean _____ elevation.

Answer 7

Sea

Question 8

An inaccurate ______ determination in GNSS observation ________ error because the computed distance between the… and the satellite is incorrect.

Answer 8

Ambiguity, multipath

Question 9

Free-air gravity anomaly ______ increases the observed gravity to the geoid.. the assumption that the space between the earth’s surface and the geoid has ____ mass.

Answer 9

increases, dense

Question 10

The _____ of the earth is approximately ______.

Answer 10

Flattening, 1/300

Question 11

_______ is the determination of the ______ position of a survey at… using the observed directions from the station to points of known positions.

Answer 11

resection, unknown

Question 12

The equatorial bulge of the earth is approximately equal to _______ km.

Answer 12

42.72 km (26.58 miles)

Question 13

The convergency correction between two geodetic control points to the product of the _______ longitude difference in arc seconds multipl… the sine of the mean ________

Answer 13

longitude, latitude

Question 14

The equinox is one of the two points of intersection of the celestial equator occupied by the sun when its declination ______ degrees.

Answer 14

Ecliptic, 0

Question 15

The orbital planes of the GPS satellites are inclined by ____ degrees with respect to the ______.

Answer 15

55, equator

Question 16

The classical definition of geodesy at present has been extended to include the temporal variations of the earth’s surface and the ______ field.

Answer 16

Gravity

Question 17

The geoid can be defined as the _______ surface of the earth’s gravity field which best fits, in a least squares sense, a _____ mean

Answer 17

Equipotential, global

Question 18

In real-time kinematic (RTK) GNSS Surveys, a base station at the known point transmits connects to the ______.

Answer 18

Rover

Question 19

In the relation between Cartesian coordinates (x, y, z) and ellipsoidal coordinates (latitude, longitude and height), z=[(b^2/a^2)] times ______, where the value N is the radius of curvature in the prime vertical.

Answer 19

sin φ

Question 20

When the center of the ______ of a geodetic datum coincides with the center of the mass of the earth, the geodetic datum is ______.

Answer 20

ellipsoid, geocentric

Question 21

In GNSS surveying, set-up errors include errors in centering the ______ and measuring the height of _______ at a control point.

Answer 21

tribrach, intrument

Question 22

Multipath causes GNSS signals to travel along ______ paths.

Answer 22

Longer

Question 23

GPS receivers show that the prime meridian at Greenwich is approximately ____ meters east of the zero longitude of space-based location systems such as WGS84.

Answer 23

122

Question 24

_______ in antenna height measurement are a common source of error in GNSS surveys because all GNSS surveys are ____ dimensional whether the vertical component will be used or not.

Answer 24

blunders, three

Question 25

A ____ in the value of a _____ angle between a back-sight and other survey point.

Answer 25

bearing, clockwise

Question 26

The angle between the _____ plane and a line joining a point on ellipsoid to the center of the ellipsoid is called ______ geodetic latitude.

Answer 26

equatorial

Question 27

Vertical deflection are ____ in flat areas than in steep mountain slopes.

Answer 27

Zero

Question 28

The arithmetic differencing of carries phases measured by a single GNSS receiver tracking _____ GNSS satellites deletes all ______ errors.

Answer 28

Four, Clock

Question 29

______ gravimeters are based directly on measuring the acceleration of free fall.

Answer 29

Absolute

Question 30

RTK GPS surveys require _____ of observation through independent ____ of stations to detect blunders and for network adjustment.

Answer 30

redundancy, re-occupation

Question 31

Astronomic azimuth is based on the true shape and rotation of the earth; whereas ______ azimuth is based on the _____ approxiationof the earth’s

Answer 31

grid, mathematical

Question 32

Greenwich time is equal to local time plus the ____ of the place of observation

Answer 32

longitude

Question 33

The sum of the squares of the errors _____ by the number of errors called _________.

Answer 33

divided, standard deviation

Question 34

The semi-major radius of the world geodetic system of is ______ meters.

Answer 34

6378.137