OMPS NRT Data and Information
The Ozone Mapping and Profiler Suite (OMPS) is aboard the joint NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) satellite, which launched in October 2011. Near real-time (NRT) OMPS data products include total column ozone, total column sulfur dioxide (SO2), vertical ozone profile swath, and aerosol index. These NRT data products are available through LANCE within three hours of satellite observation.
To download NRT OMPS data, register for an Earthdata Login. Use the table below to access specific LANCE data products.
Instructions for downloading data via https and on automating scripts can be found below.
OMPS / Suomi NPP
|NMTO3NRT||OMPS-NPP L2 NM Ozone (O3) Total Column swath orbital NRT||0.129||Worldview Browse|
|NPBUVO3-L2-NRT||OMPS-NPP L2 NP Ozone (O3) Vertical Profile swath orbital NRT||0.007||N/A|
|NMSO2-PCA-L2-NRT||OMPS/NPP PCA SO2 Total Column 1-Orbit L2 Swath 50x50km NRT||0.016||Worldview Browse|
|NMMIEAI-L2-NRT||OMPS/NPP Nadir Mapper Near UV Aerosol Index Product 1-Orbit L2 Swath 50x50km NRT||0.25||Worldview Browse|
Directory path: https://omisips1.omisips.eosdis.nasa.gov/outgoing/OMPS/LANCE/<data type>/ where <data type> is the specific data type, e.g., NMTO3-L2-NRT, NMSO2-PCA-L2-NRT, etc.
Each file contains the imagery data stored as a float32 and can be imported into a GIS.
|NMSO2PCApbl/||SO2 Planetary Boundary Layer (PBL)|
|NMSO2PCAstl/||SO2 Upper Troposphere and Stratospheric Layer|
|NMSO2PCAtrl/||SO2 Lower Troposphere Layer|
|NMSO2PCAtrm/||SO2 Middle Troposphere Layer|
OMI and OMPS downloads are being switched from ftp to https. NASA's Earth Science Data and Information System (ESDIS), our parent organization, requires that we track who downloads files and we do this via Earthdata Login and/or App Keys.
Earthdata Login is appropriate when using a browser as the redirection for http will work correctly. However, when using the command line tools this becomes complex. To simplify this we have implemented App Keys; you generate a key and pass it to your script in a header.
Requesting an App Key
App Keys are string tokens that identify who you are. App Keys get passed in the authorization header of each http GET request and they last at least three months, which means they can be used in scripts. Any user that does not already have an App Key for OMI/OMPS SIPS can get one by performing the following steps:
- Go to the Level-1 and Atmosphere Archive and Distribution System Distributed Active Archive Center (LAADS DAAC) URL: https://ladsweb.modaps.eosdis.nasa.gov/tools-and-services/
- Login by going to Profile → Earthdata Login
- Note the first time you login via Earthdata Login, it will prompt you to accept authorization of Sentinel3 and MERIS; you must accept to continue
- Select Profile / App Keys from the top menu
- Create your new App Key by entering a description and clicking the "Create New App Key" button
- Highlight and copy the App Key from the list and save in a file for use later
Retrieving an App Key
Any forgotten or lost App Keys can be retrieved using the following steps:
- Login to the LAADS DAAC web site using the Profile → Earthdata Login menu
- Select Profile / App Keys from the top menu
- Highlight and copy any existing App Keys from the list
Users are permitted to have more than one App Key at a time.
To use the App Key with wget (replace MY_APP_KEY with key copied from website):
wget -nd -r --header='Authorization: Bearer MY_APP_KEY' https://omisips1.omisips.eosdis.nasa.gov/outgoing/PATH_TO_MY_FILE
Same example with curl:
curl -H 'Authorization: Bearer MY_APP_KEY' https://omisips1.omisips.eosdis.nasa.gov/outgoing/PATH_TO_MY_FILE" > result
The example above passes your App Key via the Authorization HTTP header while utilizing the Bearer schema. When finished, the resulting download will be written to a file called “result“ in whatever directory (folder) you run the command from.
The App Key located in the header is how the SIPS identifies users. If the App Key is invalid or missing, the command will not work.
To get a listing (to standard out) of the OMTO3 directory via wget use:
wget -nd --header='Authorization: Bearer MY_APP_KEY' https://omisips1.omisips.eosdis.nasa.gov/outgoing/OMTO3 -O -
To download a single file:
For example OMI-Aura_L2-OMTO3_2018m0529t0918-o73776_v883-2018m0529t120750.he5 go to the current directory:
wget -nd --header='Authorization: Bearer MY_APP_KEY' https://omisips1.omisips.eosdis.nasa.gov/outgoing/OMTO3/OMI-Aura_L2-OMTO3_2018m0529t0918-o73776_v883-2018m0529t120750.he5
To download all files in the OMTO3 directory to a given directory
FOO in this case and filters out any file ending in '.html' :
wget -r -nd --header='Authorization: Bearer MY_APP_KEY' -R ".html" https://omisips1.omisips.eosdis.nasa.gov/outgoing/OMTO3 -P FOO
Example scripts and more information can be found at: https://ladsweb.modaps.eosdis.nasa.gov/tools-and-services/data-download-scripts/
If using the the example scripts found on ladsweb, the URL must be changed to the omisips URL: https://omisips1.omisips.eosdis.nasa.gov/outgoing/