Improving FLAASH atmospheric correction to accurately represent subtle features in a target’s spectral profile?

What is FLAASH atmospheric correction?

FLAASH is a first-principles atmospheric correction tool that corrects wavelengths in the visible through near-infrared and shortwave infrared regions, up to 3 µm. (For thermal regions, use the Toolbox option Radiometric Correction > Thermal Atmospheric Correction.)

Why do we perform FLAASH in remote sensing?

FLAASH handles data from virtually all visible-NIR-SWIR hyperspectral and multispectral sensors, supports off-nadir as well as nadir viewing, and incorporates algorithms for water vapor and aerosol retrieval and adjacency effect correction.

Is atmospheric correction necessary?

In general, atmospheric correction is unnecessary prior to unsupervised image classification or change detection. Chinsu et al. (2015) suggest that atmospheric correction will not improve the accuracy of results in land use and land cover (LULC) classification.
 

Which atmospheric correction method is most useful for easy detection of haze from the images and why?

Answer: Spatial “information based correction”: “spatial matching of clear and hazy regions of an image” is method used for detection of haze from the images.
 

What are two types of instrumentation used in remote sensing of the atmosphere?

There are two types of remote sensing instruments—passive and active. Passive instruments detect natural energy that is reflected or emitted from the observed scene. Passive instruments sense only radiation emitted by the object being viewed or reflected by the object from a source other than the instrument.
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What is the purpose of remote sensor?

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 is remote sensing which types of instrumentation are used in remote sensing of the atmosphere?

A remote-sensing instrument that transmits its own electromagnetic radiation to detect an object or to scan an area for observation and receives the reflected or backscattered radiation is called an active instrument. Examples are radars, scatterometers, and lidars.
 

Why is atmospheric correction of an image done?

The atmospheric correction process produce a new image that has been almost free from atmospheric disturbances. The atmospheric correction by FLAASH method can be used to improve the shallow water object reflectance pattern on SPOT-7 images according to reference data.

What is atmospheric window in remote sensing?

The places where energy passes through are called “atmospheric windows”. We use these “windows” in remote sensing to peer into the atmosphere from which we can obtain much information concerning the weather. Most of the sun’s energy comes from visible light and the near infrared portion of the electromagnetic spectrum.

What is ENVI software used for?

ENVI is the industry standard for image processing and analysis. It is used by professionals across industries to extract timely, reliable and accurate information from geospatial imagery and data because it is scientifically proven, easy-to-use and tightly integrated with Esri’s ArcGIS platform.