pretty_name: STAF data (browser mirror)
tags:
- hydrology
- streams
- nhdplus
- geospatial
STAF data: the browser mirror
The data the static STAF web app (EASI, SFARI and DEEP; the Stream Tiered Assessment Framework, https://usace-wrises.github.io/staf/) reads by HTTP range. Every file mirrors an asset of a GitHub release of https://github.com/USACE-WRISES/staf, which stays the source:
bundle/: the STAF data bundle (staf-data-current), unzipped: NHDPlus HR flowlines, catchments and their shared borders, precomputed per-catchment values, the NHDPlus V2 crosswalk with StreamCat, and national point tables (WQP, NID, NWIS, NAS), for the lower 48.xs/: the national cross-section grid (staf-xs-current, published region by region): every section's scoring numbers, what drawing or pulling a section needs, one profile per segment.points/: the bundle's national point tables (dams, stream gages, water-quality stations and results) sorted by place in small row groups, so a lookup near a site reads a few kilobytes.library/: the STAF assessment library (library): DEEP's regional assessments, calculators and EASI's method packages.engine/: the data files the STAF site engine ships with: the USGS base-flow index grid (Wolock 2003), the EPA Level III ecoregions and the physiographic divisions.
The files the app reads a few rows of at a time (each region's stream lines, StreamCat rows, V2
attributes and point extras, and the cross-section files) are written again with the same rows and values
in small pages with a page index, so a read takes kilobytes; topo/ holds each region's network topology
on its own. JSON and GeoJSON files are stored gzipped (.gz).
Files are stored under content-hashed names and never change in place; web-manifest.json (updated
last) maps each logical name to its file, size and sha256. Built from public federal datasets (USGS,
EPA, USACE, NOAA, USDA, FWS); see the STAF repository for sources and methods.