MODIS/Aqua Calibrated Radiances 5-Min L1B Swath 250m V7

The Aqua MODIS (Moderate resolution Imaging Spectroradiometer) Level-1B (L1B) product includes calibrated and geolocated at-aperture radiances for 36 bands generated from MODIS Level-1A raw sensor counts. The radiances are provided in watts/m2/micrometer/steradian. The Aqua MODIS L1B product is a set three datasets (MYD02QKM, MYD02HKM, and MYD021KM) that are produced to address the three spatial-resolution variations: 250 m, 500 m, and 1000 m.

This landing page describes the quarter-kilometer product with a short-name MYD02QKM. It provides calibrated radiances derived from the 250-m at-nadir visible band-1 and near-infrared band-2 that have central wavelengths at 0.645 µm and 0.858 µm, respectively. Each 250-m band has 40 detectors in the along-track direction. The MYD02QKM product contains the following two Science Data Sets (SDS) besides geolocation fields for latitude and longitude, quality flags, error estimates, etc.

The v7.0 Aqua MODIS MYD02QKM in netCDF4 format represents the most current version of this product that has undergone around half-a-dozen reprocessing cycles in the last 2.5 decades. Each 250-m swath granule or data-file temporally spans 5 minutes and its image dimensions measure 8,120 lines (along-track direction) by 5,416 samples (cross-track direction). The v7.0 collection’s data record starts from July 4, 2002 (2002–185). Consult the MODIS L1B User Guide to understand how to convert the per-pixel scaled integers to radiance or reflectance.