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EDG Data Set Name
Granule Shortname
Data Set Characteristics
Resolution = 1 kilometer Projection = Integerized Sinusoidal Processing Level = 2G Data Format = HDF-EOS Science Data Sets (SDSs) = 7 |
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Product Description
The MODIS Global Geolocation Angle (MODGGA) files contain information on solar illumination and instrument viewing geometry angles. These data can be used to model the geometric relationship and distance between the area of the Earth's surface imaged, the sun, and the sensor. This is often required to perform atmospheric corrections, or to convert or calibrate spectral data to known (absolute) radiance or reflectance units.
The above images represent daytime geolocation information acquired over the western coast of North America on June 9, 2000. The example shown of solar azimuth (top image) quantifies the direction from which the sun was illuminating the area at the time of observation. The example of solar zenith (bottom image) quantifies the angle of vertical elevation between the ground surface and the sun during the same time. MODMGGA also contains information on sensor angle quantified in a similar manner as the examples shown above. The combination of sensor and solar angle information allows the relative position of a surface target to be determined.
MODMGGA files are used as input to higher level products such as MODIS Surface Reflectance (MOD09). Geometric information for each sensor observation is stored on a geolocated grid with Level 2 geophysical parameters stored as Level 2G (gridded) products. The multiple observations stored in the L2G grids are examined by the Level 3 processes to extract only the most relevant observations per grid cell.
| SDS | Units | Data Type -bit | Fill Value | Valid Range | Scaling Factor |
|---|---|---|---|---|---|
| Solar Azimuth | Degree | 16-bit signed integer | -32767 | -18000,18000 | 0.01 |
| Solar Zenith | Degree | 16-bit signed integer | -32767 | 0,18000 | 0.01 |
| Sensor Azimuth | Degree | 16-bit signed integer | -32767 | -18000,18000 | 0.01 |
| Sensor Zenith | Degree | 16-bit signed integer | -32767 | 0,18000 | 0.01 |
| Range (pixel-sensor) | Meters | 16-bit unsigned integer | 0 | 27000 | 25 |
| Geolocation Flags | Bit | 8-bit unsigned integer | 255 | 0,248 | na |
| # Observations | na | 8-bit signed integer | -1 | 0,127 | na |
View a Version Formatted for Printing
Order These Data through the EOS Data Gateway
MODIS/TERRA GEOLOCATION ANGLES DAILY L2G GLOBAL 1KM ISIN GRID DAY V003
EOS Data Gateway Search Tips
| Data Center: | LPDAAC |
|---|---|
| Sensor: | MODIS |
| Dataset: | MODIS/Terra Geolocation Angles Daily L2G Global 1km ISIN Grid Day |
| Geographic Extent: | Type Lat/Long Range or Draw on Map |
| Temporal Extent: | August 29, 2002 (2002241) - October 7, 2002 (2002280) |
Product Information
| Product Description - Not Available |
| User Guide - Not Available |
| Algorithm Theoretical Basis Document (ATBD) - See ATBD-MOD-28 (http://modis.gsfc.nasa.gov/data/atbd/level1_atbd.php) |
| MODIS Standard Data Products Catalog - No description available for MODMGGAN (http://modis.gsfc.nasa.gov/data/dataprod/index.php) |
| EOS Data Products Handbook Volume 1 (2000) (http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/data_products/vol1.php) |
Contact Information
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LP DAAC User Services U.S. Geological Survey (USGS) Earth Resources Observation and Science Center (EROS) 47914 252nd Street Sioux Falls, SD 57198-0001 |
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| Phone: | 605-594-6116 |
| Toll Free: | 866-573-3222 |
| 866-LPE-DAAC | |
| Fax: | 605-594-6963 |
| Email: | LPDAAC@eos.nasa.gov |
| Web: | http://LPDAAC.usgs.gov |
| LP DAAC | EROS Home | About | Products | Data Tools | Order Data | News | Help/Edu | Links | Contact Us |
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