Geolocation pointer files detail the spatial relationship between each sensor observation and its corresponding output grid cell for the MODIS Terra satellite. These files are produced by the LANCE-MODIS system to support higher-level products like surface reflectance. Data is generated in near real time on a daily basis.
Use Cases
- Map sensor observation coordinates to Level-2G grid cells using stored geometric information.
- Filter multiple observations per grid cell for Level-3 processing by examining the pointer relationships.
- Generate input for MODIS Surface Reflectance products by utilizing the spatial pointer data.
Strengths
- Provides daily near real time updates for timely analysis.
- Contains geometric information for each individual sensor observation.
- Supports the generation of higher-level, gridded geophysical products.
Limitations
- Specific row count, column names, and file size are unknown.
- Data is limited to daytime observations from the Terra satellite platform.
- The spatial resolution is fixed at 250 meters.
Provenance
- Source
- NASA LANCE-MODIS system.
- Collection Method
- Satellite sensor observations from the MODIS instrument on the Terra platform, processed into Level-2G gridded pointer files.
- Time Range
- Daily coverage.
- Freshness
- Daily near real time.
- Geography
- Global.