MODIS/Terra Near Real Time (NRT) Surface Reflectance Rolling-8-Day L3 Global 500m SIN Grid provides surface reflectance values for seven spectral bands at a 500-meter resolution. The product is a rolling 8-day composite, selecting the best pixel observation based on criteria like cloud absence and low view angle. It is produced by the LANCEMODIS organization using data from the MODIS instrument aboard NASA's Terra satellite.
Use Cases
- Monitor vegetation health and calculate indices like NDVI using reflectance values from Bands 1 and 2.
- Track land surface changes over time by analyzing the day-of-year pixel values across consecutive 8-day composites.
- Filter for high-quality observations in downstream analysis using the provided quality assessment data field.
- Model surface biophysical properties by incorporating the solar, view, and zenith angles provided for each pixel.
Strengths
- Provides data at a 500-meter spatial resolution for detailed regional analysis.
- Offers a daily rolling 8-day composite, improving observation probability by selecting the best pixel from an 8-day period.
- Includes seven spectral bands of surface reflectance, enabling multi-spectral analysis.
Limitations
- Pixel selection criteria may introduce temporal smoothing, not representing a single instantaneous observation.
- The 500m resolution may be too coarse for applications requiring fine-scale feature detection.
- Near real-time latency means data is not instantaneous and may have a short processing delay.
Provenance
- Source
- LANCEMODIS organization, utilizing the MODIS instrument on NASA's Terra satellite.
- Collection Method
- Satellite remote sensing, with pixels selected from Level-2G observations based on coverage, view angle, and cloud/aerosol conditions.
- Time Range
- null
- Freshness
- Near real-time, with a daily rolling 8-day product cycle.
- Geography
- Global coverage in a Sinusoidal (SIN) grid projection.