Sentinel 2 Bands and Combinations: There are 13 Sentinel 2 bands in total. Each band is 10, 20, or 60 meters in pixel size.
Sentinel 2 consists of 2 satellites. First came Sentinel 2A which was propelled in 2015. Next came Sentinel 2b in 2017.
Two extra satellites (Sentinel 2C and 2D) are wanted to dispatch in 2020 and 2021. This will make a total of four Sentinel-2 satellites.
Overall, these 2 additional satellites will cut the revisit time in half.
Sentinel 2 Bands
Sentinel-2 carries the Multispectral Imager (MSI). This sensor conveys 13 ghastly groups extending from 10 to 60-meter pixel size.
It’s blue (B2), green (B3), red (B4), and close to infrared (B8) channels have 10-meter goals.
Next, its red edge (B5), close infrared NIR (B6, B7, and B8A) and short-wave infrared SWIR (B11 and B12) have a ground testing separation of 20 meters.
Finally, its coastal aerosol (B1) and cirrus band (B10) have a 60-meter pixel size.
|B1||60 m||443 nm||Ultra Blue (Coastal and Aerosol)|
|B2||10 m||490 nm||Blue|
|B3||10 m||560 nm||Green|
|B4||10 m||665 nm||Red|
|B5||20 m||705 nm||Visible and Near Infrared (VNIR)|
|B6||20 m||740 nm||Visible and Near Infrared (VNIR)|
|B7||20 m||783 nm||Visible and Near Infrared (VNIR)|
|B8||10 m||842 nm||Visible and Near Infrared (VNIR)|
|B8a||20 m||865 nm||Visible and Near Infrared (VNIR)|
|B9||60 m||940 nm||Short Wave Infrared (SWIR)|
|B10||60 m||1375 nm||Short Wave Infrared (SWIR)|
|B11||20 m||1610 nm||Short Wave Infrared (SWIR)|
|B12||20 m||2190 nm||Short Wave Infrared (SWIR)|
Sentinel Band Combinations
We use band combinations to better understand the features in imagery. How we do this is by improving the accessible directs in innovative manners.
By using band blends, we can remove explicit data from a picture. For instance, there are band blends that feature geologic, agrarian or vegetation includes in a picture.
If you want to see Sentinel band combinations for yourself, you can check out the Sentinel Playground. It visualizes the band combinations below, as well as several more.
Natural Color (B4, B3, B2)
The natural color band combination uses the red (B4), green (B3), and blue (B2) channels. Its motivation is to show symbolism in a similar way our eyes see the world. Much the same as how we see, solid vegetation is green. Next, urban highlights frequently seem white and dim. At long last, water is a shade of dim blue contingent upon how clean it is.
Color Infrared (B8, B4, B3)
The color infrared band blend is intended to underscore sound and undesirable vegetation. By utilizing the close infrared (B8) band, it’s particularly acceptable at reflecting chlorophyll. This is the reason in a shading infrared picture, denser vegetation is red. Be that as it may, urban zones are white.
Short-Wave Infrared (B12, B8A, B4)
The short-wave infrared band blend utilizes SWIR (B12), NIR (B8A), and red (B4). This composite shows vegetation in different shades of green. By and large, darker shades of green demonstrate denser vegetation. In any case, dark-colored is characteristic of exposed soil and developed zones.
Agriculture (B11, B8, B2)
The agribusiness band mix utilizes SWIR-1 (B11), close infrared (B8), and blue (B2). It’s, for the most part, used to screen the soundness of harvests since how it utilizes short-wave and close to infrared. Both these bands are especially acceptable at featuring thick vegetation which shows up as dim green.
Geology (B12, B11, B2)
The geology band mix is a slick application for finding land highlights. This incorporates issues, lithology, and geographical formations. By leveraging the SWIR-2 (B12), SWIR-1 (B11), and blue (B2) bands, geologists tend to use this Sentinel band combination for their analysis.
Bathymetric (B4, B3, B1)
As the name infers, the bathymetric band mix is useful for beachfront examinations. The bathymetric band mix utilizes the red (B4), green (B3), and seaside band (B1). By utilizing the beachfront vaporized band, it’s useful for assessing suspended silt in the water.
Vegetation Index (B8-B4)/(B8+B4)
Since close infrared (which vegetation emphatically reflects) and red light (which vegetation retains), the vegetation record is useful for evaluating the measure of vegetation. The equation for the standardized distinction vegetation record is (B8-B4)/(B8+B4). While high qualities propose thick shade, low or negative qualities demonstrate urban and water features.
Moisture Index (B8A-B11)/(B8A+B11)
The moisture index is ideal for finding water stress in plants. It utilizes the short-wave and close to infrared to produce a file of dampness content. All in all, wetter vegetation have higher qualities. In any case, lower dampness list esteems recommends plants are under stress from insufficient moisture.
Sentinel 2 Data Access and Software
If you’re looking to download Sentinel 2 data, you’re the best bet is the Sentinel Open Access Hub (previously known as Sentinels Scientific Data Hub)
This data portal is managed by the European Space Agency (ESA) and contains all the latest acquisitions from all the Sentinel satellites.
Finally, if you’re looking to analyze, manipulate, or just visualize the imagery, the SNAP Toolbox is completely free for everyone to use.
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