MODIS/Terra Surface Reflectance Rolling-8-Day L3 Global 500m SIN Grid NRT provides surface reflectance values for Bands 1-7 at 500-meter resolution. The product is generated daily as a rolling 8-day composite, selecting the best pixel observation based on coverage, view angle, and cloud absence. LANCEMODIS produces this dataset.
Use Cases
- Monitor vegetation health over time using the 8-day composite reflectance values from Bands 1-7.
- Analyze land surface changes by comparing pixel values selected for high observation coverage and low view angle.
- Assess atmospheric conditions and data quality using the provided quality assessment Science Data Set (SDS).
- Model surface albedo or energy balance using reflectance data alongside solar, view, and zenith angles.
- Track seasonal phenology cycles using the day of the year data associated with each pixel.
Strengths
- Provides 500-meter spatial resolution for detailed regional analysis.
- Offers daily updated 8-day composite products for near real-time monitoring.
- Includes multiple data layers: reflectance for 7 spectral bands, quality flags, and geometric angles.
Limitations
- Pixel selection criteria may introduce bias by filtering out cloudy or high-aerosol observations.
- The 8-day composite temporal resolution may miss short-term, sub-weekly surface events.
- Data quality is dependent on the MODIS sensor performance and calibration.
Provenance
- Source
- LANCEMODIS via NASA Earthdata.
- Collection Method
- Satellite observations from the MODIS instrument on the Terra platform, processed into Level-3 gridded products.
- Time Range
- null
- Freshness
- Near Real Time (NRT) with daily rolling updates.
- Geography
- Global coverage in a Sinusoidal projection.