Test 2

Question 1

Why is sextant coming back?

Answer 1

Navy is using it more and more now.

Question 2

What was date of first world map and why was it ground breaking?

Answer 2

1650, introduced 1 hour was 15 degrees longitude.

Question 3

What are the different types of satellite orbits?

Answer 3

Polar Orbit: 200-1000 km
Sun-synchronous: 200-1000 km
Geostationary: 35,800 km

Question 4

Why is LANDSAT important?

Answer 4

Gathers information about Earth and Climate Change and other information.

Question 5

What is difference between 15m resolution and 100m resolution?

Answer 5

15m is easier to see

Question 6

What bands are visible light energy?

Answer 6

400-700nm

Question 7

What are components of GNSS and what does GNSS mean?

Answer 7

User, Control, satellite. Global Navigation Satellite system

Question 8

What orbit is used for GPS and how many satellites?

Answer 8

Medium orbit, approximately 24

Question 9

How is range error calculated?

Answer 9

Speed of light times distance divides by 2

Question 10

How many satellites does it take to locate yourself?

Answer 10

4

Question 11

What factors can influence location and how does atmosphere effect calculations?

Answer 11

Not enough satellites, hills, valleys. Atm are different densities.

Question 12

DOP, PDOP, HDOP, VDOP

Answer 12

Dilution of precision

Question 13

What is roving receiver?

Answer 13

Rover that receives information from satellites

Question 14

What is Virtual Reference Station

Answer 14

Uses real time GNSScorrection, real time kinematics

Question 15

Azimuth versus bearing

Answer 15

Azimuth uses 0-180 degrees, bearing uses 0-90

Question 16

Why should we use remotely-sensed images?

Answer 16

Covers large area, inexpensive, displays more info.

Question 17

Examples of passively collected data

Answer 17

Data that is reflected from light source

Question 18

Examples of actively collected data

Answer 18

Data that uses a satellite to reflect from

Question 19

How is false color image constructed and what is range for light?

Answer 19

Use blue, green, and red color maps. 400-700nm

Question 20

What’s the source for passive data? How does energy from source interact with atmosphere?

Answer 20

The sun. It reflects off of it

Question 21

What is LiDAR and can it be used to collect data?

Answer 21

Light Detecting and Ranging. It can detect Karst

Question 22

How to tell difference of a false color image

Answer 22

True color has green vegetation and false has red. Teal for urban areas on a false color image

Question 23

How is image scale, resolution, and extent calculated? Why is camera size important?

Answer 23

gd=sd*(H/h)

Determines the resolution of picture

Question 24

What are the three bands of energy in a true color image?

Answer 24

Blue, green, red

Question 25

What is tilt convergence?

Answer 25

When lines look distorted

Question 26

How do you correct the calculation of geometric correction of images?

Answer 26

Accurate focal center

Question 27

What is difference of side lap and end lap?

Answer 27

Side lap on side and end lap is on end

Question 28

What is parallax?

Answer 28

Hold thumbs out and close one eye then close the other

Question 29

Stereo photographic coverage

Answer 29

Converge of images to make 3D image

Question 30

Examples of vector and raster data

Answer 30

Vector: population, boundary, rivers Raster: DEM, LiDAR, Landsat

Question 31

Difference between locally storable and web mapping service digital data

Answer 31

Locally: each computer stores and manipulates data WMS: can’t manipulate, online material downloads regularly

Question 32

Why is MODIS common to study floods?

Answer 32

It has very wide bands and different bands

Question 33

What is DEM?

Answer 33

Digital Elevation Model

Question 34

How to translate from degree to arc second

Answer 34

1 degree is 1/3600 arc seconds

Question 35

Some examples of digital images

Answer 35

Iowa, U.S., world

Question 36

How to tell if an image has been corrected for distortion?

Answer 36

Lines and shapes have changed

Question 37

What is NAIP and how is it useful?

Answer 37

National Aerial Imagery Program. Can be used for growing season of crops

Question 38

What is NLCD and why is it important?

Answer 38

National Land Cover Dataset. Each crop is indicated and land is indicated