What is the spatial resolution of Viirs AOD?

The spatial resolution of the Visible Infrared Imaging Radiometer Suite (VIIRS) Aerosol Optical Depth (AOD) product is 750 meters at nadir. This high resolution allows for detailed observation of aerosol distribution and concentration, which is critical for various environmental and atmospheric studies.

Understanding VIIRS AOD Resolution

Spatial resolution refers to the smallest feature a sensor can distinguish on the Earth's surface. For VIIRS AOD, a resolution of 750 meters at nadir means that each pixel in the AOD product represents an area of approximately 750 meters by 750 meters when the satellite is directly overhead.

• Nadir Point: "Nadir" specifically refers to the point on the Earth's surface directly beneath the satellite. As the satellite moves away from nadir towards the edge of its scan swath, the ground resolution typically degrades due to geometric effects and increased atmospheric path length. Therefore, 750 meters represents the optimal and highest resolution achieved.
• Significance: This fine resolution is essential for accurately mapping aerosol plumes, monitoring air quality, and understanding the regional impact of pollutants and natural events like dust storms or wildfires. It allows scientists and researchers to observe localized variations in aerosol loading that might be missed by coarser resolution instruments, providing more precise data for air quality forecasting and climate modeling.

In addition to its spatial resolution, VIIRS AOD data is typically available daily. However, data acquisition can be affected by factors such as heavy cloud cover or other unfavorable atmospheric conditions, which may prevent a clear view of the surface and thus preclude a daily measurement.

VIIRS AOD Key Specifications