JPSS-1 (NOAA-20) was launched on November 18, 2017, and JPSS-2 is scheduled to launch in 2021.The VIIRS sensor was designed to extend and improve upon the series of measurements initiated by its predecessors, the Advanced Very High Resolution Radiometer (AVHRR), the Moderate Resolution Imaging Spectroradiometer (MODIS), and the Sea-viewing Wide Field-of-view Sensor (SeaWIFS). These images are called true-color or natural color because this combination of wavelengths is similar to what the human eye would see.

Going forward, we encourage everyone to use the following version:For historical reasons, VIIRS may have been defined differently in various documents, for example:While there is nothing wrong with these versions and the variations are small, it�s better to use one version consistently going forward.The actual model used was from Modtran 4.3 (Newkur). The imagery can be visualized in Since the only visible light used in these images (Band M3) is assigned to red, snow and ice appear bright red. However, this did not happen during the transition after launch and it is difficult to switch models at this point because of the potential impacts on EDR products. Bare soil and deserts will appear bright cyan in the image since it much more reflective in Band I3 and M11 than Band M3. The imagery can be visualized in Worldview, GIBS and Rapid Response. Climatologists use VIIRS data to improve our understanding of global climate change. In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area. Therefore, is also conserved. Four JPSS missions have been planned to last through 2031, and each of them will host a VIIRS instrument as part of their payload. Similar to MODIS, the VIIRS reflective solar band calibration is based on the onboard solar diffuser but the calibration equations are very different. This layer is similar to the MODIS Corrected Reflectance Bands 7, 2, 1 layer. What's the radiance unit for the VIIRS DNB? Clouds comprised of small water droplets scatter light equally in both the visible and the SWIR and will appear white. Naturally the units of this band cannot be given as a solar reflectance factor, but instead the radiance is provided: >>> print global_data ['DNB']. VIIRS Corrected Reflectance imagery is available only as NRT imagery. [1] The Suomi National Polar-Orbiting Partnership (NPP) launched on 28 October 2011 hosts the Visible Infrared Imaging Radiometer Suite (VIIRS) sensor.
Assigning that band to green means even the smallest hint of vegetation will appear bright green in the image.

This issue will be revisited in the future. If you do that, the unit simply becomes nano watts per square centimeter per steradian nW/(cm^2 -sr).Some VIIRS bands such as M3, 4, 5, 7 and others may not have the "RadianceFactors" in the SDR file because the radiance values are within a reasonable range and do not need to be scaled. The sensor resolution is 750m and 375m (M Bands are 750m, I Bands are 375m), imagery resolution is 250m, temporal resolution is daily and temporal availability for viewing in GIBS/Worldview is November 24, 2015 - present. Naturally bare soil, like a desert, is reflective in all bands used in this image, but more so in the SWIR (Band M11, red) and so soils will often have a pinkish tinge. In any case, the radiance values should be reasonable compared to the Ltyp, Lmin, and Lmax for the VIIRS band. Suomi-NPP is the initial spacecraft in the JPSS (Joint Polar Satellite Systems) series of spacecraft.

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