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GIS > CRS and Map Projection > Flashcards

CRS and Map Projection Flashcards

1
Q

What is the problem in traditional wat of locating things?

A

Subjective and can cause confucion

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2
Q

A system to measure the location
on the Earth’s surface in an
absolute way

A

Coordinate Reference System

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3
Q

Every feature in Earth surface has
a ___________.

A

location

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4
Q

CSR requires you to ______ your ___ and ___________ your ____.

A

Find your X and determine your Y.

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5
Q

In the global reference System, what is your X and Y?

A

Prime Meridian and Equator

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6
Q

They are angles
measured from the earth’s ______ to a
point on the earth’s surface.

A

Latitude and longitude, center

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7
Q

They define the location of points in the globe

A

Latitude and longitude

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8
Q

It circles above and below the equator

A

Latitude

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9
Q

Where is the latitude if it is 90 degrees

A

North Pole

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10
Q

Where is the latitude if it is -90 degrees

A

South Pole

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11
Q

What is used in measuring Latitude?

A

DMS

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12
Q

From the north to the south pole, the earth is divided into 360 degree

A

Longitude

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13
Q

At the prime meridian, _______, Longitude is 0

A

Greenwhich

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14
Q

What will happen to the longitude if it travels west?

A

the measurement would be -180 degrees

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15
Q

What will happen to the longitude if it travels east?

A

it would be positively up to 180 degrees

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16
Q

LOEX

A

Longitude, Easting and X-axis

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17
Q

LANY

A

Latitude, Northing and Y-axis

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18
Q

What is datum

A

A mathematical model to estimate the shape of the Earth

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19
Q

act similar to starting points when you give someone directions

A

Datum

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20
Q

International standard that is best fit on a global scale

A

World Geodetic System 1984-WGS 84

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21
Q

What is the starting point of the WGS 84?

A

Prime Meridian and Equator

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22
Q

2 coordinate system

A

Geographic Coordinate System
Projected Coordinate System

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23
Q

Transforming a Three-dimensional feature to Two-dimensional feature

A

Projection

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24
Q

It is measured using a meter, and has a flat and two-dimensional and needs to be specified.

A

Projected

25
Q

In this the distance is not uniformed, measured through DMS and DD and no projection technique is needed

A

Geographic

26
Q

A map or parts of a map can show one or more (but never all) of the following:

A

True Directions
True Distances
True Areas and
True Shapes

27
Q

Types of projection

A

Cylindrical
Conical and azimuthal

28
Q

One of the most used projection because of it’s precision for the
entire globe

A

Universal Transverse
Mercator

29
Q

UTM is established in ____ by
the International Union of _______ and _______.

A

1936 by the International Union of Geodesy and Geophysics

30
Q

It is a standard set of map projections with a central meridian for each six-degree-wide UTM zone.

A

UTM Coordinate System

31
Q

Why is there 60 time zones?

A

Because 360/ 6

32
Q

The central meridian is given an easting of ______________ m.

A

500 000 m

33
Q

when calculating coordinates for
locations in the northern
hemisphere, the equator has a
northing of ___ m

A

0

34
Q

in the southern hemisphere, the
equator has northing of
_____________ m

A

10,000,000 m

35
Q

It is a local projection specifically for the Philippines primarily used for surveying and political boundaries.

A

Philippine Reference System

36
Q

how many zones does PTM Uses?

A

5 Zones

37
Q

How does PTM reduce distortion?

A

by creating series of central meridian

38
Q

It generally preserves shapes of the countries

A

Mercator Projection

39
Q

Originally used for navigation

A

Mercator Projection

40
Q

It fails to represent the size of countries ea Green land and Africa

A

Mercator Projection

41
Q

Equal area map, displays a more accurately land area

A

Gall-Peters Projection

42
Q

This projection distorts the shape of the countries

A

Gall-Peters Projection

43
Q

It provides round-the-clock and precise information from space.

A

Satellite

44
Q

Google Maps use this projection because its ability to preserve shape and angle makes close up view of cities more accurate.

A

Mercator Projection

45
Q

In 1988 this projection was used because of its balance in size and shape accuracy

A

Winkel Tripel

46
Q

What is the value along the equator?

A

0 degrees

47
Q

What is the latitude value at the South Pole?

A

-90 degrees

48
Q

What is the latitude value at the North Pole?

A

90 degrees

49
Q

This is the geodetic datum that was first defined in 1911 and is suitable for use in the Philippines.

A

Luzon 1911

50
Q

It became the standard reference system for all surveying and mapping activities in the Philippines by virtue of EO 45

A

PRS 1992

51
Q

It defines the initial point and reference surface

A

Datum

52
Q

It determines how locations are referenced from the datum.

A

Coordinate system

53
Q

No map can rival a globe in truly representing the surface of the entire Earth

A

TRUE

54
Q

Provide 5 advantages of flat maps over globes.

A

a. they are more compact and easier to store
b. they readily accommodate an enormous range of scales
c. they are viewed easily on computer displays
d. they can facilitate measuring properties of the terrain being mapped
e. they can show larger portions of the earth’s surface at once
f. and they are cheaper to produce and transport

55
Q

This coordinate system has linear units of measure

A

Projected coordinate system

56
Q

This coordinate system has decimal degrees or degree, minute and second as unit of measurement.

A

Geographic coordinate system

57
Q

The earth is divided into how many zones?

A

60 zones

58
Q

What zone does most parts of the Philippines are located?

A

51N

GIS (3 decks)

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