Search found 157 matches

by GES DISC - jimacker
Thu May 06, 2021 4:31 pm America/New_York
Forum: Questions/Comments
Question: MODIS Aqua SST and Chl-a Product
Replies: 2

Re: MODIS Aqua SST and Chl-a Product

Giovanni receives the standard MODIS-Aqua chlorophyll-a (chlor_a) data product from the OBDAAC. The algorithm is described here:

https://oceancolor.gsfc.nasa.gov/atbd/chlor_a/
by GES DISC - jimacker
Thu May 06, 2021 4:18 pm America/New_York
Forum: Questions/Comments
Question: Satellite and airborne atmosphere and aerosol data
Replies: 2

Re: Satellite and airborne atmosphere and aerosol data

Mengmeng, For aerosol optical depth, because it is a cumulative measure of light absorption / scattering in the atmosphere, there is not a value at a specific altitude. For water vapor, the Atmospheric Infrared Sounder (AIRS) provides data at specific pressure levels (hPA); these pressure levels can...
by GES DISC - jimacker
Thu May 06, 2021 3:36 pm America/New_York
Forum: Questions/Comments
Question: Water vapour, ozone and aerosol data from MERRA-2 datasets
Replies: 6

Re: Water vapour, ozone and aerosol data from MERRA-2 datasets

Mengmeng, Thank you for your query. Unfortunately, what you are seeking is not clear from the way your question is phrased. Do you want instructions on how to acquire these variables from our system for specific dates and locations? Or are you trying to compare these MERRA-2 variables to data variab...
by GES DISC - jimacker
Mon May 03, 2021 3:48 pm America/New_York
Forum: Questions/Comments
Question: Release announcement for Giovanni Version 4.35
Replies: 0

Release announcement for Giovanni Version 4.35

Giovanni Version 4.35 has just been released at the Goddard Earth Sciences Data and Information Services Center (GES DISC). The new release provides new video (movie) and Animated GIF download options for the Animation visualization service, and 24 regional shapefiles which provide better map depict...
by GES DISC - jimacker
Mon May 03, 2021 3:36 pm America/New_York
Forum: Questions/Comments
Question: chlorophyll a in the Southern Ocean
Replies: 1

Re: chlorophyll a in the Southern Ocean

The Giovanni system, https://giovanni.gsfc.nasa.gov/ , provides a simple data access method for MODIS-Aqua chlorophyll data, including the period of your interest. Are you just seeking the average chlorophyll for the Southern Ocean south of 55 S, or do you wish to see data for specific regions? Eith...
by GES DISC - jimacker
Fri Apr 16, 2021 3:54 pm America/New_York
Forum: Questions/Comments
Question: Soil porosity
Replies: 3

Re: Soil porosity

This answer was provided by a GLDAS subject matter expert at Goddard Space Flight Center. The Global Land Data Assimilation System (GLDAS) does not use different parameters for “deep” (2-150cm) soil porosity. It only uses the one porosity map for all layers, shown on the LDAS website with an image ...
by GES DISC - jimacker
Wed Apr 14, 2021 3:38 pm America/New_York
Forum: Questions/Comments
Question: UUI subsetting "datasetID" - how to find?
Replies: 5

Re: UUI subsetting "datasetID" - how to find?

Hello, Here is the answer provided by our GES DISC staff. There are two ways to get the DatasetId. 1. The search API (https://disc.gsfc.nasa.gov/information/howto?keywords=api&title=How%20to%20Use%20the%20Web%20Services%20API%20for%20Dataset%20Searching) does provide a way to get the DatasetID; ...
by GES DISC - jimacker
Tue Apr 13, 2021 11:06 am America/New_York
Forum: Questions/Comments
Question: UUI subsetting "datasetID" - how to find?
Replies: 5

Re: UUI subsetting "datasetID" - how to find?

Thanks for your question. I will forward it to our developers for comment.
by GES DISC - jimacker
Mon Apr 05, 2021 2:32 pm America/New_York
Forum: Questions/Comments
Question: MODIS SST product
Replies: 21

Re: MODIS SST product

"Binned" simply refers to the collection of valid observations. With 1 km (at nadir) resolution, a "bin" will be each 4x4 km region on the Level 3 data grid. Any valid 1 km pixel observation during the time period (8-day, monthly) will be added to the appropriate bin. At the end ...
by GES DISC - jimacker
Fri Apr 02, 2021 3:45 pm America/New_York
Forum: Questions/Comments
Question: MODIS SST product
Replies: 21

Re: MODIS SST product

The previous post does a good job of covering the answers to both questions posed. The monthly SST data product (as for all the other monthly ocean color data products) is a product of binning and averaging -- all of the valid measurements for a specific location are "binned", and then at ...