MindMap Gallery sensor
Introduction to Remote Sensing Chapter 3 Sensors. Sensors are information output devices that can collect and detect electromagnetic radiation (reflected or emitted) energy from ground objects and targets, and convert it into digital signals or other required forms according to certain rules.
Edited at 2023-10-15 23:04:33This is a mind map about bacteria, and its main contents include: overview, morphology, types, structure, reproduction, distribution, application, and expansion. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about plant asexual reproduction, and its main contents include: concept, spore reproduction, vegetative reproduction, tissue culture, and buds. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about the reproductive development of animals, and its main contents include: insects, frogs, birds, sexual reproduction, and asexual reproduction. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about bacteria, and its main contents include: overview, morphology, types, structure, reproduction, distribution, application, and expansion. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about plant asexual reproduction, and its main contents include: concept, spore reproduction, vegetative reproduction, tissue culture, and buds. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about the reproductive development of animals, and its main contents include: insects, frogs, birds, sexual reproduction, and asexual reproduction. The summary is comprehensive and meticulous, suitable as review materials.
sensor
Sensor basic information
basic components
Sensor classification
① According to the working wavelength, it can be divided into visible light sensors, infrared sensors and microwave sensors, etc.
② According to the working mode, it can be divided into active sensors and passive sensors.
③According to the data recording mode, it can be divided into imaging mode sensors and non-imaging mode sensors.
performance
resolution
Spatial resolution (ground resolution)
instantaneous field of view
total field of view
instantaneous field of view
pixel
The smaller the ground value corresponding to the pixel is, the higher the spatial resolution is and the more geometric details of ground objects can be identified in the image.
Number of line pairs
Spectral resolution
The higher the spectral resolution, the more targeted the special research will be, the higher the object recognition accuracy will be, and the better the results of remote sensing application analysis will be.
radiometric resolution
radiation quantification level
effective quantization level
Summarize
Photographic type sensor
traditional aerial camera
Classification
frame camera
slit camera
panoramic camera
multispectral camera
Advantages and Disadvantages
digital video camera
advantage
working principle
CCD
CCD is a semiconductor. The CCD sensor is equivalent to the film of a traditional camera. It is essentially a shift memory composed of MOS (metal-oxide-semiconductor) capacitors arranged according to a certain pattern. Sensors (or light-sensitive cells) on each array sense radiant energy from each pixel within the image area. When this energy is transferred to the surface of the sensor, a small charge is created as the amount of charge equalizes the brightness of the scene in the pixel. This process results in a The generation of pixel brightness value for each photosensitive unit.
CCD photosensitivity process: The process of CCD photosensitivity is the process in which photons impact the photosensitive element to generate signal charges, and the charges are stored and transmitted through the MOS on the CCD. CCD or CMOS semiconductors are more sensitive to changes in brightness from the image field than silver halide crystals in film. The dynamic range of scene brightness values observed by electronic sensors is also wider than that of film.
CCD and CMOS image sensors are monochromatic. To obtain color data, the photosensitive cells on each sensor array are covered with blue, green, and red color filters. Usually, the photosensitive unit is square and consists of alternating blue, green, and red photosensitive units forming a Bayer pattern. Half of the color filters in the array are green, and the other half are equal amounts of blue and red color filters. .
Methods to acquire multiple multispectral bands simultaneously
1
2
3
Aviation digital camera classification
Generally divided into
Frame CCD camera
Push Broom CCD Camera
According to the size of the area array sensor array, it is generally divided into small, medium and large format cameras.
Typically, the vertical track and along-track swath dimensions of a digital camera sensor are determined by the number and size of pixels in each direction on the sensor array.
Multispectral scanning type sensor
scanner
cross track scanner
Monorail Scanner
Classification
Optical-mechanical scanner
It consists of two parts: mechanical scanning device and spectroscopic device.
Advantages and Disadvantages
pushbroom scanning
charge coupled device CCD
advantage
area array sensor
Line array sensor
Advantages and Disadvantages
Hyperspectral Imaging Spectrometer
hyperspectral remote sensing
imaging spectroscopy
imaging spectrometer
imaging spectroscopy
Classification
Imaging spectrometer with area array detector and pushbroom scanner
Line array detector plus light machine scanner imaging spectrometer
Advantages, Disadvantages and Solutions
thermal infrared sensor
thermal infrared band
heat detector
Radiometer
heat detector
microwave sensor
Non-imaging microwave sensors
microwave scatterometer
radar altimeter
Imaging Microwave Sensor
radar
visual radar
True aperture view radar
synthetic aperture radar
lidar system
lidar
Advantage
Classification
Varies by platform
Ground lidar
According to working method
Fixed lidar scanner
Mobile lidar scanner
airborne lidar
Spaceborne lidar
According to the principle of distance measurement
pulse type
phase type
Wavelength dialed back
According to spot size