MODIS/Terra Calibrated Radiances 5-Min L1B Swath 1000m V7

The MOD021KM product contains the twelve Science Data Sets (SDS) besides geolocation fields for latitude and longitude, quality flags, error estimates, etc. Besides data and information for the 1-km reflective solar and thermal emissive bands, aggregated 250-m and 500-m bands are also generated through simple weighting functions that are applied to the data at their native resolution. Band 26 is a reflective solar band (RSB), which is handled uniquely.

Notwithstanding its RSB status, it is transmitted along with the thermal band data. Consequently, the band order for the night-mode data is re-organized so that the Band 26 data are written to the RSB 1-km SDSs and not to the emissive band SDSs. The v7.0 Terra MODIS MOD021KM 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 1000-m swath granule or data-file temporally spans 5 minutes and its image dimensions measure 2,030 lines (along-track direction) by 1,354 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.