1.7-1.10 Flashcards
T or F. All passive remote sensing systems rely on energy that originates from sources other than the sensor itself, typically in the form of either reflected radiation from the sun or emitted radiation from earth surface features.
True
the _____________ always modifies the strength and spectral distribution of the energy received by a sensor
atmosphere
T or F. Atmosphere restricts where we can look spectrally, and its effects vary with wavelength, time, and place
True
Factors needed to be considered in remote sensing (6)
- energy source
- atmosphere
- energy-matter interactions at the earth’s surface
- sensor
- data processing and supply system
- users of remotely sensed data
_________ is an ideal sensor that is simple and reliable, require virtually no power or space, be available whenever and wherever needed, and be accurate and economical to
operate.
supersensor
T or F. Supersensors exist
False. No single sensor is sensitive to all wavelengths or energy levels. All real sensors have fixed limits of spatial, spectral, radiometric and temporal resolution.
T or F. Every material reflected and/or emitted energy in a unique, known way.
False. Radically different material types can have great spectral similarity, making identification difficult.
Oldest GNSS system, initiated its operations in 1978 and was available for global use from 1994.
Global Positioning System (United States)
Global Navigation Satellite System in Russia that became operational in 1993 and has 27 satellite constellation
GLONASS (Russia)
GNSS in Europe that became operational in 2016 and has 30 satellite constellation
Galileo (EU)
GNSS that in China that has 2 separate constellation
BeiDou
GNSS in China also known as COMPASS that is operational in 2011 with 35 satellite constellation.
Beidou 2
GNSS that was originally planned as a satellite-based augmentation system but will launch an independent GNSS with 7 satellites
QZSS (Japan)
What does QZSS means
Quasi-Zenith Satellite System
A GNSS in India that initiated in 2013 with 7 satellite constellation
IRNSS-NAVIC
___________ from satellites is the basis of the system in GNSS
Trilateration
In GNSS, to Trilaterate, GPS Measures distance using _______________
the travel time of a radio signal
In GNSS, to measure travel time, GPS needs very accurate clock. T or F.
True
In GNSS, aside from knowing the distance to satellite, a user needs to know the satellite location. T or F.
True
As the GPS signal travels through the Ionosphere and earth’s atmosphere, what happens to the signal.
it gets delayed
GNSS errors
- clock bias
- satellite ephemeris errors
- errors due to atmospheric conditions
- receiver errors
- multi-path errors
SBAS stands for
Satellite-based augmentation systems
It is the computer-based systems that can deal with virtually any type of information about features that can be referenced by geographical location.
Geographic Information Systems (GIS)
____________ is the general-purpose database that has been enhanced to include spatial data that represents objects defined in a geometric space, along with tools for querying and analyzing such data.
Geodatabase
It is a collection of information that organizes data in predefined relationships where data is stored in one or more tables (or relations) of columns and rows.
Relational database
A GIS functions that is interrelating data of the same locational position.
Overlay analysis
A GIS functions that combines detailed map categories to create new, less detailed categories
Aggregation
_______________- zone of specified width around one or more features
Buffering
A GIS function that permits such determinations as finding the shortest path through a street network or determining the stream flows in a drainage basin.
Network analysis
This GIS functions has operations that use elevation data to permit viewshed mapping of what terrain features can be “seen” from a specified location.
Intervisibility
GIS function that portrays terrain surfaces from a viewing position other than vertical.
Perspective views
