National Hydrography Dataset (United States)

The National Hydrography Dataset (NHD) represents the water drainage network of the United States with features such as rivers, streams, canals, lakes, ponds, coastline, dams, and stream gages. More information at https://www.usgs.gov/national-hydrography/national-hydrography-dataset The initial data in this is just NHDFlowlines, and the 'M' coordinate has been removed (as GeoParquet does not yet support M).

geoparquet

hydrography

nhd

Product Details

Visibility: Unlisted
Owner: Chris Holmes
Created: 2 Feb 2025
Last Updated: 15 Aug 2025

Product Contents

root

Product Details

Product Contents

National Hydrography Dataset (United States)

The National Hydrography Dataset (NHD) represents the water drainage network of the United States with features such as rivers, streams, canals, lakes, ponds, coastline, dams, and stream gages. More information at https://www.usgs.gov/national-hydrography/national-hydrography-dataset The initial data in this is just NHDFlowlines, and the 'M' coordinate has been removed (as GeoParquet does not yet support M).

geoparquet

hydrography

nhd

Product Details

Visibility: Unlisted
Owner: Chris Holmes
Created: 2 Feb 2025
Last Updated: 15 Aug 2025

Product Contents

root

README

This repository is just some experimentation right now. To start it only provides NDHFlowlines, with the M coordinate stripped. Attempts to convert some of the other fully country layers didn't go as well.

The process to get the flowlines was to download the GeoPackage from https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Hydrography/NHD/National/GPKG/ and export was done with QGIS into FlatGeobuf. This did the spatial ordering, and then it was translated into GeoParquet with GDAL, using the defaults plus zstd compression.

NHDFlowline.parquet

15.81 GB

README.md

546 Bytes

README

This repository is just some experimentation right now. To start it only provides NDHFlowlines, with the M coordinate stripped. Attempts to convert some of the other fully country layers didn't go as well.

The process to get the flowlines was to download the GeoPackage from https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Hydrography/NHD/National/GPKG/ and export was done with QGIS into FlatGeobuf. This did the spatial ordering, and then it was translated into GeoParquet with GDAL, using the defaults plus zstd compression.

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National Hydrography Dataset (United States)

National Hydrography Dataset (United States)