Photographs and images Flashcards
All photographs are images vice versa, true or false?
False
A collection of pixels laid out in a specific order with width and height is called
Digital image
Images can be considered
Any pictorial representation
The wavelength of light commonly called color is referred to as
Hue
……. indicates how pure a color is or how much white a color is mixed with
Saturation
The path followed by a satellite is called
Orbits
Satellites at a very high altitude which view the same portion of the earth surface at all times by matching the earth’s speed and rotation is called?
Geostationary or geosynchronous
Where orbits follow a N-S which in conjunction with the rotation of the earth allows then to cover most of the surface of the earth overtone is
Polar or near polar orbits
……. cover each area of the world at a constant local time called local sun time.
Sun-synchronous
The area being seen by the sensor at a particular time is
SWATH
Between a person’s view from an airplane and from space, who sees more details and less area ?
The plane’s view
A measure of the level of detail in an image often referred in terms of ground area represented by pixel is called?
Spatial resolution
The angular cone of visibility of the sensor minted on a platform is called ….
Instantaneous field of view (IFOV)
The smallest unit of an image is called
a pixel
Pixel and spatial resolution are the same, true or false?
False
The ability of a sensor to define very narrow wavelength intervals is called ,
spectral resolution
Black and white images are as a result of ….
poor spectral resolution
Colored film is as a result of ….
fine spectral resolution
Poor spectral resolution records as
one
Fine spectral resolution records bands as
separate
Polar orbits have an inclination near
90 degrees
The major orbits are
polar and sun-synchronous
Polar orbits take approximately…..for the satellite to complete one orbit.
90 minutes
Which orbits are used for satellites that need a constant amount of sunlight?
sun-synchronous
Satellite that image the earth work best with
bright sunlight
Satellite that measure long wave radiation works best in
complete darkness
Geostationary satellites are
weather satellites
Sun-synchronous satellites are
land monitoring
The smallest size of an object that can be detected
spatial resolution
The angular cone of visibility of the sensor is
IFOV
For a uniform feature to be detected, it has to be ……. than the resolution cell.
equal to or larger
The entire area seen by all detectors is called
a scene
……describes the ability to discriminate very slight differences in energy.
Radiometric resolution
Radiometric characteristics describe the
actual information content in an image
The length of time it takes for a satellite to complete one entire orbit cycle is
temporal resolution
Plants reflect different levels of green during the year, a sensor with which form of resolution can distinguish the levels?
radiometric
Lossy is used to describe ….
an image format whose detail has been lost after being compressed
Lossless is used to describe an image file format that
retains all its data after being compressed
A lossless file format than can be compressed and is best for archiving
Tiff / geotiff
Created for photography and can contain a lot of colors ….
JPG or JPEG
A lossless format that supports animated and static images
GIF
Provides a higher lossless compressions of giffs which is useful for storage of images for intermediate editing.
PNG (portable network graphics)
The format that stores information for an image, one band at a time is called ?
BSQ (band sequential format)
Stores first pixel for all bands first
BIP (band interleaved by pixel)
Stores the first line of the first band
BIL (band interleaved by line format)
Which sensor is used for capturing wavelength within the visible and infrared regions ?
Optical sensor
The unique x’tics illustrated by an object when in contact with radiation is
spectral signature
RADAR operates in the …..portion of the EM spectrum.
microwave
Which sensor uses laser light in the near infrared portion of the EMR?
LIDAR
Images are captures in two ways namely
framing and scanning
