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Sources of Geospatial Data and Attribute Data

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Sources of Geospatial Data and Attribute Data

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Questions and Answers

What is the main purpose of SBAS (Satellite-based augmentation systems)?

To enhance internet connectivity in remote areas

To study the impact of climate change on satellite signals

To support regional augmentation through additional satellite-broadcast messages (correct)

To provide global navigation for commercial aircrafts

How many orbital planes does the GPS constellation have?

3 (correct)

Which satellite positioning system was launched first?

LIDAR

GLONASS

GPS (correct)

SBAS

What is the purpose of using multiple frequencies in GPS positioning?

To improve accuracy and mitigate signal distortion Signup and view all the answers

How many satellites make up the nominal GPS constellation?

24 Signup and view all the answers

What is the significance of GPS satellites having antipodal distribution?

It helps in minimizing signal interference between satellites Signup and view all the answers

What is the primary purpose of land surveying?

To measure the positions of natural and man-made features on the Earth's surface Signup and view all the answers

Which technique provides map-like coverage of very large areas?

Aerial photogrammetry Signup and view all the answers

What is a key feature of aerial photogrammetry?

Use of stereo pairs for a 3D view Signup and view all the answers

Which satellite series is known for its global remote sensing capabilities?

Sentinel Series (ESA) Signup and view all the answers

What is the main function of Global Navigation Satellite Systems (GNSS)?

Measuring positions on the Earth's surface using satellite technology Signup and view all the answers

In geospatial data collection, what is LIDAR primarily used for?

Measuring accurate planimetric and elevation data Signup and view all the answers

What does the acronym LIDAR stand for?

Light Detection and Ranging Signup and view all the answers

In the context of attribute data collection, what is the characteristic of data measured on a Ratio Scale?

Data have a true zero point and can be compared using ratios Signup and view all the answers

Which type of measurement scale assigns discrete categories that have a specific order but the exact differences between the categories are not known?

Ordinal Scale Signup and view all the answers

What is the purpose of Aerial LIDAR Range Scan in land surveying?

Measuring distances from an aircraft to the ground using laser beams Signup and view all the answers

What does GAGAN stand for in the context of satellite remote sensing?

Global Positioning System Aided Geo Augmented Navigation Signup and view all the answers

What is the main function of Inertial Navigation System in conjunction with LIDAR during aerial photogrammetry?

Determining the aircraft's position and orientation without external references Signup and view all the answers