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CV-GNLM code and inputs for agricultural data-source uncertainty in Central Valley N surplus
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Type: Resource
Storage: The size of this resource is 674.5 MB
Created: Oct 01, 2026 at 8:32 p.m. (UTC)
Last updated: Oct 07, 2026 at 10:39 p.m. (UTC) (Metadata update)
Published date: Oct 07, 2026 at 10:39 p.m. (UTC)
DOI: 10.4211/hs.fc5d22afebb845a09d55305e3bf67679
Citation: See how to cite this resource
Content types: Geographic Raster Content  CSV Content 
Sharing Status: Published
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Abstract

Code, inputs and crop data-source summaries for the Central Valley Groundwater Nitrogen Loading Model (CV-GNLM) used in Bhaduri et al. (Nature Sustainability, 2026). The resource reproduces 2020 nitrogen (N) surplus (potential root-zone N loading) at 50 m resolution across California's Central Valley under bounded combinations of crop fertilizer and harvest N from UC Davis Cost and Return Studies, CDFA, USDA surveys and census, and Irrigation and Nitrogen Management Plan (INMP) reports, with full, half and no dairy manure. township.m runs the 2020 model and maps township hotspot ranks and Groundwater Protection targets; the README lists all files and steps.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
North Latitude
40.6938°
East Longitude
-118.4740°
South Latitude
34.8893°
West Longitude
-122.6410°

Temporal

Start Date:
End Date:

Content

Data Services

The following web services are available for data contained in this resource. Geospatial Feature and Raster data are made available via Open Geospatial Consortium Web Services. The provided links can be copied and pasted into GIS software to access these data. Multidimensional NetCDF data are made available via a THREDDS Data Server using remote data access protocols such as OPeNDAP. Other data services may be made available in the future to support additional data types.

Web Map Service

https://geoserver.hydroshare.org/geoserver/HS-fc5d22afebb845a09d55305e3bf67679/wms?request=GetCapabilities

Web Coverage Service

https://geoserver.hydroshare.org/geoserver/HS-fc5d22afebb845a09d55305e3bf67679/wcs?request=GetCapabilities

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
California State Water Resources Control Board None 19-051-250-2
USDA Natural Resources Conservation Service None NR233A750023C047
USDA National Institute of Food and Agriculture None 2021-68012-35914

Contributors

People or Organizations that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.

Name Organization Address Phone Author Identifiers
Georgios Kourakos University of California, Davis California, US

How to Cite

Bhaduri, B., Harter, T., Kourakos, G. (2026). CV-GNLM code and inputs for agricultural data-source uncertainty in Central Valley N surplus, HydroShare, https://doi.org/10.4211/hs.fc5d22afebb845a09d55305e3bf67679

This resource is shared under the Creative Commons Attribution CC BY.

 http://creativecommons.org/licenses/by/4.0/
CC-BY

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