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Please place all new topic requests/questions within the "Comments" section below. Your request will be moderated and, once approved, added to the forum as a new thread for comment/discussion. 
Note: To comment within the forums, an Earthdata Login is required. 

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  1. Hi,

    I downloaded these MOPITT NRT products from the NRT website. 



    However, I am unable to open the files using Panoply.  I get this error message from Panoply: 

    There is an error opening the dataset: Conflicting Dimensions = nTime

    I could use some advice on how to open these HDF files.


  2. Panoply is an excellent tool for viewing gridded data. However, MOPITT L2 data (NRT or otherwise) is not gridded so Panoply is not the appropriate tool.

    In our User's Guide there is sample code for reading L2 data.

  3. Hi,

    I am a Spanish researcher involved in atmospheric remote sensors. I do not know if this site is appropriate to post my request which falls within the range of the physical principles behind the operation principle and retrieval step of  sensors like GOME-2 or OMI. I would like to clarify some aspects  (not found in the consulted bibliography) regarding the overall impact of an hypothetical deviation of the Nadir viewing (leading to inclined pixels) on instrument performance. I would appreciate it very much if you could help me find the information I would post my questions if my request is approved.

    Thanks very much.

  4. Hi,

    I am new in aerosol field but I have experience with working with SAR satellite data and I know this is completely different. I have some questions:

    1. I plan to plot aerosol products in troposphere but I do not know which one is the best option between (Lidar Level 2 5 km Cloud and Aerosol Profile Products)

     and (Lidar Level 2 5 km Cloud and Aerosol layer Products)



    Would you please guide me?

    1. There are same information about Column Optical Properties in two type of profile and layer products that I mentioned above like:


    Column Optical Depth Cloud 532

    Column Optical Depth Aerosols 532

    Column Optical Depth Aerosols 1064

    Column Optical Depth Stratospheric 532

    Column Optical Depth Stratospheric 1064


    What is difference between column optical depth in profile product and layer product?

    1. What is the meaning with ‘Column Optical Depth Stratospheric’? is it any Column Optical Depth meaturemets for both cloud and aerosols in Stratospheric layer? Then how about troposphere? Is there any data exactly for troposphere?
  5. Hello,

    I am looking for this page that allows us to enter the gps coordinates and then the webpage will return a solar radiation record. Please see attached picture. Please I do need this data or tool desperately. Does anyone has the link to this page please?

    Thank you very much in advanced.

  6. Hey,

        The image is so tiny I can't tell what it is. Is this for SSE? Please tell me the tool and the product so I can figure out who can work this issue,. We are a little distracted by Hurricane Florence planning today. (sad)

  7. I think you are after SSE. This site has been replaced by the team and I have pasted in some guidance from the team that may be helpful

    As you may have noticed for a few months, there has been a notice at the top of the SSE page indicating that the site would be transitioning to a new location. This actually happened in June. To allow time for users to get use to the new site, we have delayed shutting down the old site until now. It is no longer available.

    Please access your data through the new data web portal at with improved solar and meteorology data and greatly enhanced capabilities to facilitate access to NASA's solar insolation and meteorological data parameters. Rest assured that all parameters currently on SSE are now available at the new POWER web site although the parameters might be organized differently. Also note that we have endeavored to ensure that citations and links to the old SSE URL will be seamlessly redirected to the new POWER site.

  8. Hi,

    Where can i find the optimal angle of inclination of solar panels for given coordinates in a certain month and on average for the year on the new site? Earlier in the table it was OPT ANG.

    Thank you in advanced.

  9. The answer was provided by the POWER Science Team. 

    The OPT ANG parameter is a part of the “Solar Irradiance for Equator Facing Tilted Surfaces (Set of Surfaces)” parameter available through the POWER Data Access Viewer (DAV) at  Below is a step-by-step outline of how this parameter can be accessed via the DAV .
    When the DAV page opens you may click the “Access Data” box and/or check the “Do not show ..” box to avoid loading the splash Page on subsequent visits. 
    1.     In the DAV page that is now visible, select the SSE-Renewable Energy user community in Section 1
    2.     Click the Climatology button in Section 2 
    3.     Enter the site latitude and longitude in Section 3
    4.     Note that if Climatology is selected in Section 2, there is not need to enter a time period in section 4 since by default monthly values are currently averaged over the climatological time period July 1983 – June 2005.
    5.     In Section 5, Select Output File Format. 
    6.     The OPT ANG parameter is one of several output parameters with the “Solar Irradiance for Equator Facing Tilted Surfaces (Set of Surfaces)”, which is the first listing under the “Tilted Solar Panels” folder
    7.     After selecting the parameter, clicking the “Submit” button in Section 7 opens a page that will give you the opportunity to plot a time series plot of the selected parameters.
    8.     Clicking the blue button under the “Output Files” will download data in the previously selected format.
    The following is a sample of the ASCII output you will get from selecting this parameter:
    NASA/POWER SRB/FLASHFlux/MERRA2/ 0.5 x 0.5 Degree Climatologies 
    22-year Additional Solar Parameter Monthly & Annual Climatologies (July 1983 - June 2005), 30-year Meteorological and Solar Monthly & Annual Climatologies (January 1984 - December 2013) 
    Location: Latitude  34.1991   Longitude -100.916 
    Elevation from MERRA-2: Average for 1/2x1/2 degree lat/lon region = 709.56 meters   Site = na 
    Climate zone: na (reference Briggs et al: 
    Value for missing model data cannot be computed or out of model availability range: -999 
    SI_EF_TILTED_SURFACE       SRB/FLASHFlux 1/2x1/2 Solar Irradiance for Equator Facing Tilted Surfaces (Set of Surfaces) (kW-hr/m


    SI_EF_OPTIMAL              SRB/FLASHFlux 1/2x1/2 Solar Irradiance Optimal (kW-hr/m


    SI_EF_OPTIMAL_ANG          SRB/FLASHFlux 1/2x1/2 Solar Irradiance Optimal Angle (Degrees) 
    SI_EF_TILTED_ANG_ORT       SRB/FLASHFlux 1/2x1/2 Solar Irradiance Tilted Surface Orientation (N/S Orientation) 
    Northward facing tilted surfaces are designated negative (-) 
    PARAMETER                     JAN       FEB       MAR       APR       MAY       JUN       JUL       AUG       SEP       OCT       NOV       DEC       ANN       
    SI_EF_TILTED_SURFACE_0        2.86      3.36      4.83      6.00      6.32      6.82      6.98      6.07      5.09      4.13      3.11      2.60      4.85      
    SI_EF_TILTED_SURFACE_19       3.83      4.09      5.46      6.24      6.22      6.55      6.77      6.15      5.57      4.97      4.07      3.58      5.29      
    SI_EF_TILTED_SURFACE_34       4.36      4.41      5.63      6.06      5.78      5.96      6.21      5.86      5.61      5.32      4.57      4.13      5.33      
    SI_EF_TILTED_SURFACE_49       4.63      4.49      5.49      5.59      5.10      5.14      5.40      5.30      5.34      5.37      4.81      4.44      5.09      
    SI_EF_TILTED_SURFACE_90       4.02      3.47      3.67      3.00      2.31      2.12      2.27      2.65      3.29      4.02      4.03      3.95      3.23      
    SI_EF_OPTIMAL                 4.67      4.49      5.63      6.24      6.35      6.82      6.99      6.18      5.63      5.39      4.83      4.50      5.64      
    SI_EF_OPTIMAL_ANG             57.00     46.00     35.00     18.00     6.00      1.00      3.00      13.00     28.00     44.00     54.00     59.00     30.00     
    SI_EF_TILTED_ANG_ORT             S         S         S         S         S         S         S         S         S         S         S         S         S      
    I hope the above information helps you navigate and download the parameter you need for continued use of the POWER data portal.  Please feel free to contact me if you have additional questions.
  10. Perfect! Thank you very much.

  11. Is it possible to build a solar insolation schedule per the hour of the particular day?

    I can do it only per days of the year in the section of Climatology - Tilted Solar Panels - Direct Normal Radiation.

  12. The answer was provided by the POWER Science Team.

    The true hourly series is most useful for system management and analysis to assess the output of the solar system relative to the time of day.  This is particularly if the building is connected to the grid and the utility has different charges by hour.  Now, the HOMER decision support tool ( does require hourly data for a “year” but it focuses on integrating solar, wind, and other conventional power source (i.e., diesel, propane, etc.) for off grid and on-grid systems.  HOMER downloaded the old monthly averaged data set and used statistical models to create hourly data for a “year”.  HOMER also uses hourly typical design years.  Currently, the geosynchronous data that POWER solar irradiance is derived from does not have hourly data before 2000 and thus we do not produce hourly data for the long-term series.   POWER may consider adapting an hourly data set from another data source but this has not been completed.

    We should note that the RETScreen Expert design package ( does use daily data and long-term monthly data for it’s data management and feasibility design packages.  Thus, the current POWER data holdings are readily sufficient to support RETScreen functionality, if using RETScreen is an option for the user.

    Lastly, we do provide climatological averages of the 3-hourly solar irradiance by month and location.  With this information a user can better understand, at least to a 3-hourly interval how the solar diurnal cycle varies on average in that location.

  13. As an additional point, one could construct an hourly model using statistical models and could try using the monthly and monthly 3-hourly average information to constrain the model.  Statistical variability could be determined from the nearest hourly surface measurement site. 

  14. Thanks guys!

    I think I understood in which direction to look.

  15. Developed a new MODIS mask; The Empirical Cloud Mask Algorithm (ECMA). Unlike the standard MODIS mask, The ECMA is capable to discriminate effectively between heavy aerosols (dust) and clouds that appear over both land and water, does not depend on thresholds. It can be generated using SeaDas in near-real-time using Level2 HDF MODIS file that includes the required six at-sensor Rayleigh-corrected reflectance bands (469 nm, 555 nm, 645 nm, 859 nm, 1380 nm, 2130 nm) and the two Brightness Temperature bands (thermal bands) at 11 μm and 12 μm. The ECMA can be downloaded from

  16. I like the quick response from all of you here. I am new to this forum and will like to learn more from you. I have difficulties accessing air quality data after registering and authorizing approvals from my profile. I keep getting re-directions to a page form approvals and authorizations. Pls what should I do to access and download data from this website.

  17. How will I get aerosol extinction coefficient data? I have already ordered
    the aerosol level 2 profile data but couldn't get any information about
    AOD. Please help me with the data retrieval method.

    1. HI my quetion is. why is there that lead spot on the satellite image

      1. Your question has been forwarded to ASDC User Services. They will be in touch with you via email.

    2. Your question has been forwarded to ASDC User Services. They will be in touch with you via email.

  18. Hello,

    I would like to calculate the energy irradiated onto a PV-System that is following the sun. Using the POWER Data Access Viewer and the Community SSE I get the data for direct normal radiation and albedo. I am missing a dataset for the diffuse radiation onto a plane that is following the sun.

    If I'd use a fixed tilted plane, then I would calculate the diffuse irradiation Energy using a isotropic radiation model by: E_diff_tilt=E_diff_hor*0.5(1+cos(angle)). Since the real existing diffuse irradiation is anisotropic I cannot use this because the greatest part of the energy is expected to come from around the sun. The diffuse irradiation should inrease when following the sun, right?

    Are there any setting options that return me that dataset or is it somehow possible to calculate the diffuse irradiation onto a normal plane?

    I will create MATLAB model for off-grid plants soon. Is it possible to get the data in timesteps of one minute? The CAMS radiation service, a part of the copernicus programme provides such data. The problem there is, that the scanned area of the earth is too small.


  19. Your question has been forwarded to ASDC User Services. They will be in touch with you via email.