Terra Product Descriptions: MODAODHD
Last update: February 9 2015
Data Set Short Name:
Data Set Long Name:
MODIS/Terra valueadded Aerosol Optical Depth
The MODIS Near Real Time (NRT) Level-3 value-added Aerosol Optical Depth, MODAODHD, is a gridded product and is specifically designed for quantitative applications including data assimilation and model validation. The Naval Research Laboratory and the University of North Dakota developed MODAODHD based on MODIS Level 2 aerosol products. It is available through LANCE-MODIS. It offers several enhancements over the MODIS Level 2 data on which it is based. These enhancements include stringent filtering to reduce outliers, eliminate cloud contamination, and exclude conditions where aerosol detection is likely to be inaccurate; reduction of systematic biases over land and ocean by empirical corrections; reduction of random variation in AOD values by spatial averaging; quantitative estimation of uncertainty for each AOD data point.
The MODAODHD granules are produced every six hours and timestamped 00:00 06:00 12:00 and 18:00 (all times UTC). Each granule includes MODIS observations from +/-3 hours from the timestamp (e.g. 12:00 product includes MODIS data from 09:0015:00 UTC). Production is initiated as soon as the Level 2 inputs become available in the LANCE system.
4 files per day
0.5 deg. at nadir
File Size MB:
The Naval Research Laboratory and the University of North Dakota/
MODIS Adaptive Processing System (MODAPS)