| --- |
| 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. |
|
|
