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The Hydro-Network Linked Data Index

The Hydro Network Linked Data Index (NLDI) puts a restful application programming interface (API) in front of the National Hydrolography dataset. Now, instead of needing to be a GIS professional, any web developer can build tools against the core data in the NHD in a scalable, workable way.

Date Posted May 10, 2022 Last Updated March 24, 2026

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The Hydro-Network Linked Data Index

The Hydro Network Linked Data Index (NLDI) puts a restful application programming interface (API) in front of the National Hydrolography dataset. Now, instead of needing to be a GIS professional, any web developer can build tools against the core data in the NHD in a scalable, workable way.

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