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#           USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - MERRA-2 C2      

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      By Earth Resources Observation and Science (EROS) Center       June 28, 2021    

            -              Overview           
            -              Science           
            -              Web Tools           

Modern Era Retrospective analysis for Research and Applications Version 2 (MERRA-2) is a NASA atmospheric reanalysis that provides data beginning in 1980. MERRA-2 provides atmospheric data that are used as input to the radiative transfer model used to determine surface temperature.

Back to Products Overview

These data are available for users wanting to generate custom Level-2 products using the Collection 2 surface reflectance and surface temperature algorithms. **It is not necessary for users to download the atmospheric auxiliary data for use with Collection 2 Level-2 products. **

The USGS uses either MERRA-2 or GEOS-5 FP-IT data for Surface Temperature processing.MERRA-2 data are used in the ST algorithm for Landsat 4-7 data for global products when GEOS-5 FP-IT data is not available (prior to 2000).

The USGS creates NetCDF files that contain the subset of the MERRA-2 datasets used in ST processing. Each daily global file contains "H" height, "QV" specific humidity, and "T" air temperature values on a grid of 576 longitude, 361 latitude, and 42 pressure levels, for 8 times within the day (every 3 hours). The axis values are recorded in the "lat", "lon", "lev", and "time" datasets, respectively. The new files are in the same format and spatio-temporal resolution as the original MERRA-2 or GEOS-5 FP-IT files

### **Additional Information**

                                - Landsat Collection 2 Atmospheric Auxiliary Home Page
                                - Landsat Atmospheric Auxiliary Data - Data Format Control Book (DFCB) 

### **Access Data**

Use EarthExplorer to search and download the MERRA-2 C2 Subset Product. The data are located under the Landsat category, Atmospheric Auxiliary Data, and listed as MERRA-2 C2 Subset.

### **Digital Object Identifier (DOI)**

Atmospheric Auxiliary Data – MERRA-2 C2 Subset Digital Object Identifier number(DOI): /10.5066/P9HI8JTZ

### Contacts

#### USGS EROS Customer Services 

custserv@usgs.gov

1-800-252-4547

### Explore Search

                      - Landsat 
                      - Products and Datasets
                      - Remote Sensing
                      - Remote Sensing Research and Development
                      - Information Systems
                      - Maps and Mapping
                      - Landsat Atmospheric Auxiliary
                      - MERRA-2

View All **

Below are other science projects associated with this product.

link

June 28, 2021

####                 USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - TOMS C2              

Earth Resources Observation and Science (EROS) Center 

link

June 28, 2021

####   USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - TOMS C2

Learn More

link

June 28, 2021

####                 USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - MODIS Fused C2              

Earth Resources Observation and Science (EROS) Center 

link

June 28, 2021

####   USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - MODIS Fused C2

Learn More

link

June 28, 2021

####                 USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - NCEP/NCAR Reanalysis C2              

Earth Resources Observation and Science (EROS) Center 

link

June 28, 2021

####   USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - NCEP/NCAR Reanalysis C2

Learn More

link

June 28, 2021

####                 USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - GEOS-5 FP-IT C2              

Earth Resources Observation and Science (EROS) Center 

link

June 28, 2021

####   USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - GEOS-5 FP-IT C2

Learn More

link

June 28, 2021

####                 USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - ASTER GED C2              

Earth Resources Observation and Science (EROS) Center 

link

June 28, 2021

####   USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - ASTER GED C2

Learn More

link

November 27, 2020

####                 USGS EROS Archive - Landsat Archives - Landsat 8-9 OLI/TIRS Collection 2 Level-2  Science Products              

Earth Resources Observation and Science (EROS) Center 

link

November 27, 2020

####   USGS EROS Archive - Landsat Archives - Landsat 8-9 OLI/TIRS Collection 2 Level-2  Science Products

Learn More

link

March 4, 2020

####                 USGS EROS Archive - Landsat Archives - Landsat 7 ETM Plus Collection 2 Level-2 Science Products              

Earth Resources Observation and Science (EROS) Center 

link

March 4, 2020

####   USGS EROS Archive - Landsat Archives - Landsat 7 ETM Plus Collection 2 Level-2 Science Products

Learn More

link

March 4, 2020

####                 USGS EROS Archive - Landsat Archives - Landsat 4-5  TM Collection 2 Level-2 Science Products              

Earth Resources Observation and Science (EROS) Center 

link

March 4, 2020

####   USGS EROS Archive - Landsat Archives - Landsat 4-5  TM Collection 2 Level-2 Science Products

Learn More

Below are data or web applications associated with this product.

November 9, 2022

####                 EarthExplorer              

The EarthExplorer (EE) user interface is an online search, discovery, and ordering tool developed by the United States Geological Survey (USGS). EE supports the searching of satellite, aircraft, and other remote sensing inventories through interactive and textual-based query capabilities. 

Earth Resources Observation and Science (EROS) Center , Commercial Remote Sensing Space Policy, Landsat Missions, Coastal National Elevation Database (CoNED) Applications Project, Elevation Derivatives for National Applications (EDNA), Land Change Monitoring, Assessment, and Projection, Significant Topographic Changes in the United States

Modern Era Retrospective analysis for Research and Applications Version 2 (MERRA-2) is a NASA atmospheric reanalysis that provides data beginning in 1980. MERRA-2 provides atmospheric data that are used as input to the radiative transfer model used to determine surface temperature.

Back to Products Overview

These data are available for users wanting to generate custom Level-2 products using the Collection 2 surface reflectance and surface temperature algorithms. **It is not necessary for users to download the atmospheric auxiliary data for use with Collection 2 Level-2 products. **

The USGS uses either MERRA-2 or GEOS-5 FP-IT data for Surface Temperature processing.MERRA-2 data are used in the ST algorithm for Landsat 4-7 data for global products when GEOS-5 FP-IT data is not available (prior to 2000).

The USGS creates NetCDF files that contain the subset of the MERRA-2 datasets used in ST processing. Each daily global file contains "H" height, "QV" specific humidity, and "T" air temperature values on a grid of 576 longitude, 361 latitude, and 42 pressure levels, for 8 times within the day (every 3 hours). The axis values are recorded in the "lat", "lon", "lev", and "time" datasets, respectively. The new files are in the same format and spatio-temporal resolution as the original MERRA-2 or GEOS-5 FP-IT files

### **Additional Information**

                                - Landsat Collection 2 Atmospheric Auxiliary Home Page
                                - Landsat Atmospheric Auxiliary Data - Data Format Control Book (DFCB) 

### **Access Data**

Use EarthExplorer to search and download the MERRA-2 C2 Subset Product. The data are located under the Landsat category, Atmospheric Auxiliary Data, and listed as MERRA-2 C2 Subset.

### **Digital Object Identifier (DOI)**

Atmospheric Auxiliary Data – MERRA-2 C2 Subset Digital Object Identifier number(DOI): /10.5066/P9HI8JTZ

### Contacts

#### USGS EROS Customer Services 

custserv@usgs.gov

1-800-252-4547

### Explore Search

                      - Landsat 
                      - Products and Datasets
                      - Remote Sensing
                      - Remote Sensing Research and Development
                      - Information Systems
                      - Maps and Mapping
                      - Landsat Atmospheric Auxiliary
                      - MERRA-2

View All **

Below are other science projects associated with this product.

link

June 28, 2021

####                 USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - TOMS C2              

Earth Resources Observation and Science (EROS) Center 

link

June 28, 2021

####   USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - TOMS C2

Learn More

link

June 28, 2021

####                 USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - MODIS Fused C2              

Earth Resources Observation and Science (EROS) Center 

link

June 28, 2021

####   USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - MODIS Fused C2

Learn More

link

June 28, 2021

####                 USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - NCEP/NCAR Reanalysis C2              

Earth Resources Observation and Science (EROS) Center 

link

June 28, 2021

####   USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - NCEP/NCAR Reanalysis C2

Learn More

link

June 28, 2021

####                 USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - GEOS-5 FP-IT C2              

Earth Resources Observation and Science (EROS) Center 

link

June 28, 2021

####   USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - GEOS-5 FP-IT C2

Learn More

link

June 28, 2021

####                 USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - ASTER GED C2              

Earth Resources Observation and Science (EROS) Center 

link

June 28, 2021

####   USGS EROS Archive - Landsat - Atmospheric Auxiliary Data - ASTER GED C2

Learn More

link

November 27, 2020

####                 USGS EROS Archive - Landsat Archives - Landsat 8-9 OLI/TIRS Collection 2 Level-2  Science Products              

Earth Resources Observation and Science (EROS) Center 

link

November 27, 2020

####   USGS EROS Archive - Landsat Archives - Landsat 8-9 OLI/TIRS Collection 2 Level-2  Science Products

Learn More

link

March 4, 2020

####                 USGS EROS Archive - Landsat Archives - Landsat 7 ETM Plus Collection 2 Level-2 Science Products              

Earth Resources Observation and Science (EROS) Center 

link

March 4, 2020

####   USGS EROS Archive - Landsat Archives - Landsat 7 ETM Plus Collection 2 Level-2 Science Products

Learn More

link

March 4, 2020

####                 USGS EROS Archive - Landsat Archives - Landsat 4-5  TM Collection 2 Level-2 Science Products              

Earth Resources Observation and Science (EROS) Center 

link

March 4, 2020

####   USGS EROS Archive - Landsat Archives - Landsat 4-5  TM Collection 2 Level-2 Science Products

Learn More

Below are data or web applications associated with this product.

November 9, 2022

####                 EarthExplorer              

The EarthExplorer (EE) user interface is an online search, discovery, and ordering tool developed by the United States Geological Survey (USGS). EE supports the searching of satellite, aircraft, and other remote sensing inventories through interactive and textual-based query capabilities. 

Earth Resources Observation and Science (EROS) Center , Commercial Remote Sensing Space Policy, Landsat Missions, Coastal National Elevation Database (CoNED) Applications Project, Elevation Derivatives for National Applications (EDNA), Land Change Monitoring, Assessment, and Projection, Significant Topographic Changes in the United States