Podcast
Questions and Answers
What is latitude?
What is latitude?
- A circle connecting all locations at a given longitude
- The line of longitude at 0°
- The angle that describes the east-west position
- The angle that describes the north-south position (correct)
Where is the Prime Meridian located?
Where is the Prime Meridian located?
- Equator
- Royal Observatory at Greenwich in London, England (correct)
- North Pole
- South Pole
What is a parallel on the Earth's surface?
What is a parallel on the Earth's surface?
- A line of longitude at 0°
- A circle connecting all locations at a given longitude
- A circle connecting all locations at a given latitude (correct)
- A line connecting the North and South Poles
How can the Earth's shape be mathematically defined?
How can the Earth's shape be mathematically defined?
What is the accuracy range of phone GPS?
What is the accuracy range of phone GPS?
What does GNSS consist of?
What does GNSS consist of?
In which year did the first space images get captured from unmanned rockets?
In which year did the first space images get captured from unmanned rockets?
When did remote sensing begin?
When did remote sensing begin?
Which of the following is an Earth observation system?
Which of the following is an Earth observation system?
What are the Canadian innovations in Earth observation mentioned in the text?
What are the Canadian innovations in Earth observation mentioned in the text?
What does Urthecast provide?
What does Urthecast provide?
What is wavelength?
What is wavelength?
What is the most important vegetation pigment mentioned in the text?
What is the most important vegetation pigment mentioned in the text?
What does NDVI stand for?
What does NDVI stand for?
What is the smallest unit of distance that can be determined by a sensor measurement of the target?
What is the smallest unit of distance that can be determined by a sensor measurement of the target?
Why would Canada want its own receiving station for satellite data?
Why would Canada want its own receiving station for satellite data?
Approximately how long does the Landsat record go back (years or decades)?
Approximately how long does the Landsat record go back (years or decades)?
What are the most recent Landsat satellites?
What are the most recent Landsat satellites?
What are the three components of spectral resolution?
What are the three components of spectral resolution?
What happens to near infrared photons when they intercept healthy vegetation?
What happens to near infrared photons when they intercept healthy vegetation?
Name and generally describe the sensor bands on a satellite with sub-metre spatial resolution. Name three things this satellite is best suited to observe.
Name and generally describe the sensor bands on a satellite with sub-metre spatial resolution. Name three things this satellite is best suited to observe.
What is the minimum number of visible satellites needed for accurate positional location using GNSS?
What is the minimum number of visible satellites needed for accurate positional location using GNSS?
Which orbit is best suited for weather monitoring due to its consistent coverage of the same areas?
Which orbit is best suited for weather monitoring due to its consistent coverage of the same areas?
In which orbit are most remote sensing satellites located for predictable path and simultaneous measurements?
In which orbit are most remote sensing satellites located for predictable path and simultaneous measurements?
What does GNSS stand for?
What does GNSS stand for?
Which type of orbit is used for GPS tracking due to its remote location?
Which type of orbit is used for GPS tracking due to its remote location?
What is the altitude range for a geostationary orbit?
What is the altitude range for a geostationary orbit?
Which method is NOT used for space junk collection?
Which method is NOT used for space junk collection?
Which layer of Earth's atmosphere has the lowest air molecules?
Which layer of Earth's atmosphere has the lowest air molecules?
What is the primary use of geostationary orbits?
What is the primary use of geostationary orbits?
Which satellite system is NOT part of GNSS?
Which satellite system is NOT part of GNSS?
What is the best orbit for space travel due to its proximity and gravity effect?
What is the best orbit for space travel due to its proximity and gravity effect?
Which type of orbit is used for telecommunications and satellite TV satellites?
Which type of orbit is used for telecommunications and satellite TV satellites?
Which map projection distorts the size of countries, making Greenland appear similar in size to Africa?
Which map projection distorts the size of countries, making Greenland appear similar in size to Africa?
What was the meter originally defined as in 1793?
What was the meter originally defined as in 1793?
How many nanometers (nm) are equal to one micrometer (µm)?
How many nanometers (nm) are equal to one micrometer (µm)?
Which type of map covers a large area with coarse detail?
Which type of map covers a large area with coarse detail?
How is scale indicated on a map?
How is scale indicated on a map?
What is the purpose of geodetic markers?
What is the purpose of geodetic markers?
Which type of positioning is represented by coordinates of a point in space?
Which type of positioning is represented by coordinates of a point in space?
What is latitude easier to calculate in?
What is latitude easier to calculate in?
What do conformal map projections preserve?
What do conformal map projections preserve?
What is the only correct representation of the Earth's surface?
What is the only correct representation of the Earth's surface?
What is the current definition of the meter based on?
What is the current definition of the meter based on?
What is the appropriate map scale for a neighborhood?
What is the appropriate map scale for a neighborhood?
Study Notes
Earth Representation and Measurement
- The Earth can be represented using three methods: sphere, ellipsoid, and geoid, with the geoid being the only correct representation of the Earth's surface.
- Equivalent projections preserve area but distort shape, while conformal projections preserve angles but distort size.
- The Mercator projection distorts the size of countries, making Greenland appear similar in size to Africa when it is actually 1/14th the area.
- The meter was first defined in 1793 as "one ten millionth of the distance from the equator to the north pole," and is now defined based on the speed of light.
- One micrometer (1 µm) equals 1000 nm.
- Small scale maps cover a large area with coarse detail, while large scale maps cover a small area with great detail.
- Scale can be indicated on a map using a bar scale or a fractional/ratio scale.
- Appropriate map scales for different areas range from 1:40,000,000 for worldwide to 1:15,000 for a neighborhood.
- Devices for measuring distances include electron microscopes, optical microscopes, cameras, and telescopes.
- Relative positioning is determining a location relative to other landmarks, while absolute positioning is represented by coordinates of a point in space.
- Geodetic markers are points with accurately established relative and absolute positions, forming a network used for triangulation.
- Latitude is easier to calculate in ocean navigation, while longitude requires a precise clock for accuracy.
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Description
Test your knowledge of Earth representation and measurement with this quiz. Explore different map projections, scales, distance measurement devices, and positioning methods. Learn about the geoid, ellipsoid, and sphere as Earth representations, and understand the importance of accurate positioning and scale in maps.
