What is the spatial resolution of AVHRR?
AVHRR is an across track scanner that senses the Earth’s outgoing radiation from horizon to horizon in six channels (three solar channels in the visible-near infrared region and three thermal infrared channels), with a spatial resolution of 1km at nadir.
What is AVHRR in remote sensing?
The Advanced Very High Resolution Radiometer (AVHRR) is a broad-band, four or five channel (depending on the model) scanner, sensing in the visible, near-infrared, and thermal infrared portions of the electromagnetic spectrum. AVHRR data are acquired in three formats: High Resolution Picture Transmission (HRPT)
What do you mean by radiometric resolution?
Radiometric resolution refers to how much information is in a pixel and is expressed in units of bits. A radiometric resolution of 11 means the pixel has 2048 possible intensities of blue, 12 bit resolution represents 4,096 shades of blue, and 14 bits represents 16,384 shades of blue.
What does the AVHRR do?
The Advanced Very-High-Resolution Radiometer (AVHRR) instrument is a space-borne sensor that measure the reflectance of the Earth in five spectral bands that are relatively wide by today’s standards.
What is the difference between AVHRR resolutions LAC and GAC?
LAC (Local Area Coverage) is 1 km resolution data recorded onboard the satellite and transferred to the ground station at a later time. GAC (Global Area Coverage) is 4 km resolution data derived from 1 km data.
What is the radiometric resolution of geoeye 1?
0.46 m
GeoEye-1 Satellite Sensor Specifications
| Launch Date | September 6, 2008 |
|---|---|
| Resolution | 0.46 m / 1.51 ft* panchromatic (nominal at Nadir) 1.84 m / 6.04 ft* multispectral (nominal at Nadir) |
| Spectral Range | Panchromatic: 450 – 800 nm Blue: 450 – 510 nm Green: 510 – 580 nm Red: 655 – 690 nm Near Infra Red: 780 – 920 nm |
Why does the AVHRR sensor have very high resolution as part of its name when it has a spatial resolution of 1.1 km?
This is because its spatial resolution is actually very coarse at 1.1 km. So the “very high resolution” refers to its day temporal resolution and revisit times. Because of its high temporal resolution, AVHRR offers services in monitoring wildfires, flooding risk, and even volcanic eruptions.
What is the resolution of cartosat?
CARTOSAT–1 is the first Indian Remote Sensing Satellite capable of providing in-orbit stereo images. The images were used for Cartographic applications meeting the global requirements. Cameras of this satellite have a resolution of 2.5m (can distinguish a small car).
What is geometric resolution?
Geometric resolution refers to the satellite sensor’s ability to effectively image a portion of the Earth’s surface in a single pixel and is typically expressed in terms of Ground sample distance, or GSD.
What is the use of remote sensing satellites?
Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring its reflected and emitted radiation at a distance (typically from satellite or aircraft). Special cameras collect remotely sensed images, which help researchers “sense” things about the Earth.
What kind of Radiometer is the AVHRR / 3?
Europe’s Spaceport Previous launches The Advanced Very High Resolution Radiometer (AVHRR/3) is one of the complement of American instruments provided by the National Oceanic and Atmospheric Administration (NOAA) to fly on MetOp-A, B and C. The AVHRR/3 scans the Earth surface in six spectral bands in the range of 0.58 – 12.5 microns.
Which is the advanced very high resolution radiometer?
Space Transportation Ariane Vega Space Rider Future space transportation Boost! Europe’s Spaceport Previous launches The Advanced Very High Resolution Radiometer (AVHRR/3) is one of the complement of American instruments provided by the National Oceanic and Atmospheric Administration (NOAA) to fly on MetOp-A, B and C.
How many milliseconds does an AVHRR scan take?
This is generally referred to as 4 km resolution. Each scan of the AVHRR views the Earth for a period of 51.282 milliseconds (msec). The analog data output from the sensors is digitized on-board the satellite at a rate of 39,936 samples per second per channel. Each sample step corresponds to an angle of scanner rotation of 0.95 milliradian (mr).
What are the land use applications of AVHRR?
In addition, land use applications of the AVHRR include monitoring of food crops, volcanic activity, forest fires, deforestation, vegetation health, snow cover extent, sea ice extent, desert encroachment, icebergs, oil prospecting and geology applications.