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GIS > Test 2 > Flashcards

Test 2 Flashcards

1
Q

Why is sextant coming back?

A

Navy is using it more and more now.

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2
Q

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

A

1650, introduced 1 hour was 15 degrees longitude.

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3
Q

What are the different types of satellite orbits?

A

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

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4
Q

Why is LANDSAT important?

A

Gathers information about Earth and Climate Change and other information.

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5
Q

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

A

15m is easier to see

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6
Q

What bands are visible light energy?

A

400-700nm

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7
Q

What are components of GNSS and what does GNSS mean?

A

User, Control, satellite. Global Navigation Satellite system

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8
Q

What orbit is used for GPS and how many satellites?

A

Medium orbit, approximately 24

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9
Q

How is range error calculated?

A

Speed of light times distance divides by 2

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10
Q

How many satellites does it take to locate yourself?

A

4

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11
Q

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

A

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

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12
Q

DOP, PDOP, HDOP, VDOP

A

Dilution of precision

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13
Q

What is roving receiver?

A

Rover that receives information from satellites

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14
Q

What is Virtual Reference Station

A

Uses real time GNSScorrection, real time kinematics

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15
Q

Azimuth versus bearing

A

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

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16
Q

Why should we use remotely-sensed images?

A

Covers large area, inexpensive, displays more info.

17
Q

Examples of passively collected data

A

Data that is reflected from light source

18
Q

Examples of actively collected data

A

Data that uses a satellite to reflect from

19
Q

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

A

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

20
Q

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

A

The sun. It reflects off of it

21
Q

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

A

Light Detecting and Ranging. It can detect Karst

22
Q

How to tell difference of a false color image

A

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

23
Q

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

A

gd=sd*(H/h)

Determines the resolution of picture

24
Q

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

A

Blue, green, red

25
Q

What is tilt convergence?

A

When lines look distorted

26
Q

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

A

Accurate focal center

27
Q

What is difference of side lap and end lap?

A

Side lap on side and end lap is on end

28
Q

What is parallax?

A

Hold thumbs out and close one eye then close the other

29
Q

Stereo photographic coverage

A

Converge of images to make 3D image

30
Q

Examples of vector and raster data

A

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

31
Q

Difference between locally storable and web mapping service digital data

A

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

32
Q

Why is MODIS common to study floods?

A

It has very wide bands and different bands

33
Q

What is DEM?

A

Digital Elevation Model

34
Q

How to translate from degree to arc second

A

1 degree is 1/3600 arc seconds

35
Q

Some examples of digital images

A

Iowa, U.S., world

36
Q

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

A

Lines and shapes have changed

37
Q

What is NAIP and how is it useful?

A

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

38
Q

What is NLCD and why is it important?

A

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

GIS (1 decks)

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