Terra MODIS Level-2 Regional Inherent Optical Properties (IOP) - Near Real-time (NRT) Dat

The Ocean Biology DAAC produces near real-time (NRT) Inherent Optical Properties (IOP) products using Terra MODIS satellite data. These products provide per-pixel inherent optical properties, such as absorption and backscattering coefficients, derived from spectral Remote Sensing Reflectance. The data support water-type classification, water-clarity assessment, biogeochemical studies, and radiative-transfer applications.

Use Cases

• Water-type classification based on inherent optical properties like total absorption and backscattering coefficients.
• Water-clarity assessment using retrieved particulate backscattering coefficients and phytoplankton absorption data.
• Biogeochemical studies leveraging coefficients for phytoplankton, CDOM, and detritus absorption.
• Forward and adjoint radiative-transfer applications utilizing per-pixel IOP data.
• Cross-sensor comparisons enabled by IOP products, which are described as more robust than purely apparent optical property products.

Strengths

• Provides near real-time data, offering a snapshot from a single orbit.
• Includes specific geophysical variables such as total absorption coefficient (a), total backscattering coefficient (bb), and phytoplankton absorption at 443 nm (aph_443).
• Supports multiple applications including water-type classification and biogeochemical studies as described.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Row count is unknown, which may limit suitability assessment.
• The description notes that near real-time products use less-than-optimal inputs and calibration.

Provenance

Source

Ocean Biology DAAC (OB_CLOUD), NASA Earthdata

Collection Method

Derived from Terra MODIS satellite spectral Remote Sensing Reflectance using the Generalized Inherent Optical Properties (GIOP) model framework.

Freshness

Near real-time

Geography

Regional coverage (specific regions not defined)