maps,projections,charts,scale

Question 1

Types of projections and the charts derived from them

Answer 1

1) Cylindrical projection— Mercator chart
2) Conical projection—Lambert conformal chart
3) Azimuthal projection—Polar stereographic chart

Question 2

Ideal projection qualities

Answer 2

1) Gc and RL lines -straight lines
2) orthomorphic(brg on chart=brg on earth)
3) correct shape
4) adjacent sheet- fit each other
5) scale -constant& correct

Question 3

Categories of projection

Answer 3

Non perspective -Mercator &lambert

Perspective- polar stereographic ONLY

Question 4

Cylindrical projection planes

Answer 4

Vertical -Direct Mercator
Horizontal-Transverse Mercator
Diagonal- Oblique Mercator

Question 5

Direct/standard Mercator RL and GC lines ?

Answer 5

RL-straight line

GC-concave to the equator

Question 6

standard Mercator scale

Answer 6

Scale - correct at equator &expands @sec theta when moving away from Equator

Question 7

In direct Mercator Earth convergency and Chart convergency at equator and away from equator?

Answer 7

EC=CC at equator (0)

EC>CC away from eq

Question 8

Direct Mercator qualities

Answer 8

Orthomorphic

Non perspective

Question 9

Direct Mercator chart coverage

Answer 9

70degrees NORTH/ SOUTH

Question 10

Direct Mercator light source and use

Answer 10

Light source -centre

Use - countries CLOSE TO THE EQUATOR

Question 11

Transverse Mercator RL and GC ?

Answer 11

RL-concave to poles

GC -concave to equator and datum meridian

Question 12

Transverse Mercator scale ?

Answer 12

Scale - correct at datum meridian

Question 13

Transverse Mercator EC,CC ie CONVERGENCY

Answer 13

convergency correct @ equator and poles

EC=CC @ poles and eq

Question 14

Transverse Mercator qualities

Answer 14

Orthomorphic

Non perspective

Question 15

Transverse Mercator coverage

Answer 15

5degrees E/W to datum meridian

Question 16

Transverse Mercator light source and use

Answer 16

Light source- is at equator

Use - Countries with large N/S EXPANSIONS

Question 17

Oblique Mercator RL and GC

Answer 17

RL concave to poles

GC concave to DGC(datum great circle)

Question 18

Oblique Mercator scale

Answer 18

Correct at DGC

Question 19

Oblique Mercator convergency

Answer 19

Correct @ DGC

Question 20

Oblique Mercator qualities

Answer 20

Orthomorphic

Non perspective

Question 21

Oblique Mercator coverage

Answer 21

5deg above below DGC

Question 22

Oblique Mercator light source and use

Answer 22

LS - centre

Use -TO FLY GC ROUTES

Question 23

Lambert conical has

Answer 23

2 standard parallels

1 parallel of origin

Question 24

Lambert conical RL and GC

Answer 24

RL- concave to poles

GC -concave to parallel of origin

Question 25

Lambert conical scale

Answer 25

Correct at 2 standard parallels

Question 26

Lambert conical convergency

Answer 26

Correct @ parallel of origin

Question 27

Lambert qualities

Answer 27

Orthomorphic | Non perspective

Question 28

Lambert conical coverage

Answer 28

10deg N/S to 70deg N/S

Question 29

Lambert light source and use

Answer 29

Light source -centre | Use -countries with mid latitudes

Question 30

Convergency formula (lambert)

Answer 30

Chlong x sin of parallel of origin

Question 31

Constant of cone (n)

Answer 31

= sin of parallel of origin

Question 32

Polar stereographic RL and GC ( har cheez poles)

Answer 32

RL- concave to poles | GC -concave to poles

Question 33

Polar stereographic scale

Answer 33

Correct at poles

Question 34

The only perspective chart

Answer 34

Polar stereographic

Question 35

Polar stereographic qualities

Answer 35

Orthomorphic | Perspective

Question 36

Convergency of polar stereographic

Answer 36

At poles

Question 37

Coverage polar stereo

Answer 37

70deg N/S to 90deg N/S

Question 38

Light source and use of polar stereographic

Answer 38

Light source - at opposite pole | Use -countries close to poles

Question 39

Convergency formula polar stereo

Answer 39

Chlong x sin90deg | ALWAYS TAKE ANGLE AS 90deg in polar stereo

Question 40

Scale (expressed in cm) is

Answer 40

``` Chart length/ Earth length Or/And Da/Db=cosA/cosB Where d= denominator A= lat or scale to be found B=lat or scale given ```

Question 41

(KW)A perfectly straight line on a lambert chart is

Answer 41

Meridian of longitude