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The HISATZEN is the "Sensor view zenith angle exceeds threshold" sure, but what angle is the threshold set at? How can I define my own angle? The Level 2 MODIS data does not contain the sensor angle that I can find. The only angle is the Center Solar Zenith Angle, which is not helpful.
The HISATZEN Level-2 flag is set when the sensor zenith angle is greater than or equal to 60 degrees.
It is controlled by the l2gen input parameter satzen. No, the sensor zenith angle is not included in the L2 files. It is in the geolocation file that was used in the L2 processing. For MODIS, we generate that geolocation file as part of the L2 processing step, and it is not retained. However, the LAADS archive does distribute these files (referred to as MOD03): https://ladsweb.modaps.eosdis.nasa.gov/ ... odis-L0L1/