Search found 308 matches

by GES DISC - jimacker
Wed Dec 13, 2023 7:31 pm America/New_York
Forum: Questions/Comments
Question: MERRA2 wget "Unable to establish SSL connection"
Replies: 2

Re: MERRA2 wget "Unable to establish SSL connection"

Thank you for informing us.
by GES DISC - jimacker
Thu Nov 30, 2023 1:45 pm America/New_York
Forum: Questions/Comments
Question: can't find MODIS land surface temperature and vegetation index data in Giovanni
Replies: 1

Re: can't find MODIS land surface temperature and vegetation index data in Giovanni

Due to changes at the data center which provides the NDVI data, we can no longer use the search method that was used by Giovanni to find the data according to the user specifications. NDVI data can be visualized with Worldview ( https://worldview.earthdata.nasa.gov ) , and the data is actually from ...
by GES DISC - jimacker
Tue Nov 28, 2023 4:21 pm America/New_York
Forum: Questions/Comments
Question: Level 3 Daily CO2, NO2
Replies: 4

Re: Level 3 Daily CO2, NO2

The daily data will usually have gaps due to satellite scanning patterns and conditions that affect data quality. I cannot provide a lot of insight on the OCO technique, except to note that because atmospheric CO2 is a well-mixed gas, it is computationally simpler to fill the gaps via assimilated da...
by GES DISC - jimacker
Mon Nov 27, 2023 12:16 pm America/New_York
Forum: Questions/Comments
Question: Level 3 Daily CO2, NO2
Replies: 4

Re: Level 3 Daily CO2, NO2

Hello. The Giovanni system has daily Level 3 CO2, NO2, and CH4 from the Orbiting Carbon Observatory, the Ozone Measuring Instrument, and AIRS, respectively. I have created a URL for these variables in Giovanni, provided below. Note that for CH4 from AIRS, a pressure level must be provided. 1000 hPA ...
by GES DISC - jimacker
Thu Nov 23, 2023 9:59 pm America/New_York
Forum: Questions/Comments
Question: Looking for time-averaged Monthly chlorophyll-a estimations for Lake Apopka, FL
Replies: 6

Re: Looking for time-averaged Monthly chlorophyll-a estimations for Lake Apopka, FL

The only chlorophyll data we are set up to support in Giovanni is the MODIS-Aqua Level 3 data product. To get higher resolution data from MERIS, VIIRS, or OLCI, you would have to contact the data provider. I hope you will be able to use Giovanni effectively.
by GES DISC - jimacker
Tue Nov 21, 2023 4:23 pm America/New_York
Forum: Questions/Comments
Question: MERRA-2 skin temperaute
Replies: 2

Re: MERRA-2 skin temperaute

Hello, Our apologies for the delay in this reply. Our MERRA-2 Subject Matter Expert has provided this preliminary answer with a request for more information. Over the ocean, both MERRA2 and ERA5 read in SST observations, Over land, ERA5 assimilates near surface air temperature and moisture, while ME...
by GES DISC - jimacker
Tue Nov 21, 2023 4:06 pm America/New_York
Forum: Questions/Comments
Question: Cloud cover or similar data - Modis Aqua
Replies: 16

Re: Cloud cover or similar data - Modis Aqua

You are welcome. OBDAAC personnel may be able to advise on cloud cover data in SeaDAS; there may be a cloud mask that can be generated or used in the system.
by GES DISC - jimacker
Tue Nov 21, 2023 4:03 pm America/New_York
Forum: Questions/Comments
Question: Looking for time-averaged Monthly chlorophyll-a estimations for Lake Apopka, FL
Replies: 6

Re: Looking for time-averaged Monthly chlorophyll-a estimations for Lake Apopka, FL

Hello, You can get this from the Giovanni system, https://giovanni.gsfc.nasa.gov/ , but you must input the geographical coordinates for the bounding box around the lake. I just attempted to do this, and I will provide the URL, along with a couple of images to show where the resulting data are locate...
by GES DISC - jimacker
Tue Nov 21, 2023 3:47 pm America/New_York
Forum: Questions/Comments
Question: Cloud cover or similar data - Modis Aqua
Replies: 16

Re: Cloud cover or similar data - Modis Aqua

Miguel, No, those are all in-water products. If you get a file with some ocean color data and some missing data, it is common for the missing data to be due to clouds, but it can also be due to the gaps between the MODIS scanning swaths, high aerosol concentrations in the atmosphere (dust can do thi...