The NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) is pleased to announce that, in a collaborative effort with the United States Geological Survey (USGS), the North America Land Data Assimilation System Phase 2.0 (NLDAS-2) and Global Land Data Assimilation System Version 2 (GLDAS-2) data sets have been integrated into the USGS Geo Data Portal (GDP). In addition to the existing data access methods listed in the NASA GES DISC Hydrology Data Holdings Page, users can access the NLDAS-2 and GLDAS-2 data and get “Areal Statistics” for specified geo-regions, shapefiles, or polygons, through the USGS GDP.
Here is an example procedure for getting area-averaged NLDAS-2 monthly Noah 0-100 cm soil moisture content for Texas:
- Click “Landscape” tab (or “Climate” tab, or “All” tab).
- Select “NLDAS monthly Noah files.”
- Click “Areal Statistics” tab, which brings up the green button at the bottom of the page.
- Click green button, “Process Data with the Geo Data Portal.”
- Select “sample: CONUS_states,” then “STATE,” and then “Texas,” and click “Next.”
- Select “Area Grid Statistics (weighted).”
- Click “OK” in the pop-up window.
- Select “soilm0-10cm - 100 ** 0-100 cm top 1 meter soil moisture content [kg/m^2].”
- Click “Submit For Processing.”
- Input your email address to receive the result.
The figure accompanying the article shows the result link (delivered via email), as opened and displayed in Excel.
Caution: Please note that, for hourly NLDAS and 3-hourly GLDAS data, although requests that span many tens of thousands of time steps are possible, test-runs made over shorter time periods (tens of time steps) are highly recommended, to gauge the expected total time per request. Single requests should be kept small enough, such that they do not run longer than a day or two. The longer a request runs, the more chance there is of a system outage causing failure.