Search found 8 matches

by GES DISC - jschaperow
Thu May 08, 2025 11:11 am America/New_York
Forum: Home
Question: How to download NLDAS Primary forcing data for one variable in specific region
Replies: 4

Re: How to download NLDAS Primary forcing data for one variable in specific region

I am not sure why you are getting ~2000 files. If you are trying to download three years of hourly data, that means there should be 3*365*24 = 26280 individual NetCDF files, each with one timestep. Of course, downloading and processing ~26000 files to get a timeseries at one ___location is not very eff...
by GES DISC - jschaperow
Thu May 01, 2025 2:49 pm America/New_York
Forum: Home
Question: GLDAS surface water component derivation
Replies: 7

Re: GLDAS surface water component derivation

The GLDAS data do not quantify the amount of river, lake, and reservoir storage. You will likely want to consider another data source. If you wanted to take a model-based approach, you could use a model that explicitly represents river, lake, and reservoir storage (perhaps you could force the model ...
by GES DISC - jschaperow
Thu May 01, 2025 12:32 pm America/New_York
Forum: Home
Question: Downloading NLDAS Primary Forcing Data L4 Hourly
Replies: 6

Re: Downloading NLDAS Primary Forcing Data L4 Hourly

If you have a list of links, you can download them straight into R using the httr or curl R packages. You may also be interested in the earthdatalogin package here: https://cran.r-project.org/web/packages/earthdatalogin/index.html. If you need a reference for how to manipulate NetCDF files in R, thi...
by GES DISC - jschaperow
Tue Apr 29, 2025 3:08 pm America/New_York
Forum: Home
Question: How to download NLDAS Primary forcing data for one variable in specific region
Replies: 4

Re: How to download NLDAS Primary forcing data for one variable in specific region

Hi Janette, I will try to address each of your questions. 1. Long list of download links Which tutorial are you following? There is a "Download Instructions" button that appears upon getting the list of URLs from the subsetting tool. The next step is to use this list of URLs to download al...
by GES DISC - jschaperow
Thu Apr 24, 2025 11:28 am America/New_York
Forum: Home
Question: Support for NetCDF Forcing Files in LIS Simulation – NLDAS-2 Compatibility Issue
Replies: 1

Re: Support for NetCDF Forcing Files in LIS Simulation – NLDAS-2 Compatibility Issue

The NLDAS-2 v002 GRIB-1 data are no longer archived at GES DISC. We updated to NLDAS-2 v2.0, which are the same data but converted to NetCDF format. Please refer to https://disc.gsfc.nasa.gov/datasets/NLDAS_FORA0125_H_2.0/summary. If you need GRIB-1 format for compatibility with the older version of...
by GES DISC - jschaperow
Fri Apr 04, 2025 9:08 am America/New_York
Forum: Home
Question: Snow Water Equivalent (SWE) Dataset
Replies: 1

Re: Snow Water Equivalent (SWE) Dataset

Hi Shani, You can use the variable SWE_inst ("snow depth water equivalent") from GLDAS NOAH 2.0. You can see a list of GLDAS outputs in the README file for the GLDAS data products, which can be found on each of our GLDAS data collection landing pages at GES DISC, e.g. here: https://disc.gs...
by GES DISC - jschaperow
Wed Feb 12, 2025 4:13 pm America/New_York
Forum: Home
Question: GLDAS surface water component derivation
Replies: 7

Re: GLDAS surface water component derivation

Hi Gaurav, I am not sure that using runoff as a proxy for river and lake storage is a good strategy. In the GLDAS models, runoff, along with precipitation and evapotranspiration, is a flux out of (or into) a grid cell. To calculate groundwater storage change (dGW), you are using an equation like thi...
by GES DISC - jschaperow
Tue Feb 11, 2025 4:39 pm America/New_York
Forum: Home
Question: GLDAS surface water component derivation
Replies: 7

Re: GLDAS surface water component derivation

Hi Gaurav, Like Andrew said, surface water might mean different things in different contexts. In the context of the paper you linked, surface water (storage) is defined as the residual in the water balance equation (Equation 2 in the paper) when you subtract groundwater storage, soil moisture, and s...