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The OPERA Land Surface Disturbance Alert from Harmonized Landsat Sentinel-2 provisional (OPERA_L3_DIST-ALERT-HLS) Version 0 data product will no longer be available through NASA’s Earthdata Search as of April 24, 2025. Users are encouraged to transition to the OPERA_L3_DIST-ALERT-HLS Version 1 data ...

@jinyangwang11 Our science team replied with the following calculation for solar zenith angle.

cos(θz) = sin(φ)sin(δ) + cos(φ)cos(δ)cos(h)

θz = SZA

φ = latitude

δ = solar declination

h = hour angle

Best regards,
Janice

@jinyangwang11 While we are waiting for further guidance on your inquiry, there is ASTER documentation at this link that might be useful at: https://lpdaac.usgs.gov/products/ast_l1av003/#documentation
Thank you,
Janice

@jinyangwang11 I've forwarded your inquiry to our science team for further assistance.

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