{
  "schema": 1,
  "pack_id": "watershed-atlas",
  "verified_on": "2026-10-02",
  "scope": "Four separately queried drainage-unit records from the same federal WBD dataset; not four independent surveys.",
  "sources": [
    {"id":"wbd-140700070102","title":"Bryce Creek-Paria River","url":"https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/6/query?where=huc12%3D%27140700070102%27&outFields=*&returnGeometry=true&outSR=26912&f=json","huc12":"140700070102","tohuc":"140700070106","area_sqkm":74.6,"tnmid":"{47BA924F-1693-427A-A903-3B84DF9A3FB8}","rights":"USGS/NRCS public-domain WBD; service states data are open and non-proprietary with no use constraints. Credit retained.","use":"Full drainage boundary and identity; original vector generalization up to 8 m."},
    {"id":"wbd-160300020302","title":"Tropic Reservoir","url":"https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/6/query?where=huc12%3D%27160300020302%27&outFields=*&returnGeometry=true&outSR=26912&f=json","huc12":"160300020302","tohuc":"160300020303","area_sqkm":94.06,"tnmid":"{4531A764-6BFD-4CCC-B496-AA878EC0E8DE}","rights":"USGS/NRCS public-domain WBD; service states data are open and non-proprietary with no use constraints. Credit retained.","use":"Full drainage boundary, not reservoir water extent. 71.1 percent overlaps the terrain window."},
    {"id":"wbd-140700070107","title":"Yellow Creek","url":"https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/6/query?where=huc12%3D%27140700070107%27&outFields=*&returnGeometry=true&outSR=26912&f=json","huc12":"140700070107","tohuc":"140700070109","area_sqkm":40.58,"tnmid":"{9C0BFC06-6429-4D2E-928D-83B03DAECB8D}","rights":"USGS/NRCS public-domain WBD; service states data are open and non-proprietary with no use constraints. Credit retained.","use":"Full drainage boundary and identity; original vector generalization up to 8 m."},
    {"id":"wbd-140700070201","title":"Upper Sheep Creek","url":"https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/6/query?where=huc12%3D%27140700070201%27&outFields=*&returnGeometry=true&outSR=26912&f=json","huc12":"140700070201","tohuc":"140700070204","area_sqkm":76.59,"tnmid":"{93CA23CC-5F71-4855-ADC3-06029F91EEED}","rights":"USGS/NRCS public-domain WBD; service states data are open and non-proprietary with no use constraints. Credit retained.","use":"Full drainage boundary and identity; original vector generalization up to 8 m."},
    {"id":"wbd-context","title":"USGS WBD surrounding HUC12 units","url":"https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/6","rights":"Same public-domain WBD terms, independently retained service metadata.","use":"21 contextual units, source ToHUC names, and 1,726 exactly shared boundary edges separating HUC2 14 and 16. Context lines generalized by up to 12 m; divide by 8 m."},
    {"id":"nhd-local","title":"USGS National Hydrography Dataset, Flowline - Large Scale","url":"https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/6","rights":"Service identifies the NHD as public-domain data; all data open and non-proprietary. Credit retained. No photographs or background map tiles reused.","use":"1,483 full features queried; 1,452 intersect the exact 30 km terrain extent after clipping; vertex simplification up to 8 m. Permanent identifiers, names, reach codes, feature codes and FlowDir retained."},
    {"id":"nhd-dictionary","title":"USGS NHD feature definitions and flow direction","url":"https://www.usgs.gov/ngp-standards-and-specifications/national-hydrography-dataset-nhd-data-dictionary-feature-classes","rights":"Factual reference only; no media copied.","use":"Separates stream/river 460, canal/ditch 336, pipeline 428, connector 334 and artificial path 558."},
    {"id":"nhd-direction","title":"USGS NHD Flow Direction layer domain","url":"https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/3","rights":"Factual reference only.","use":"FlowDir domain 1 means WithDigitized; all 1,483 source features report 1. Arrows follow retained coordinate order."},
    {"id":"wbd-dictionary","title":"USGS WBD data dictionary","url":"https://www.usgs.gov/ngp-standards-and-specifications/watershed-boundary-dataset-wbd-data-dictionary","rights":"Factual reference only.","use":"Nominal compilation scale and ToHUC interpretation: the unit naturally receiving most flow, not every possible transfer."},
    {"id":"existing-terrain","title":"Existing BCC USGS-derived 30 km terrain display mesh","local_source":"website/public/assets/terrain/mesh-1537.webp","metadata_source":"website/public/assets/terrain/terrain.json","mesh_sha256":"1f6e587e0e69d4ec24136363510c58404035b5a795ce8489e7914a54b87e4a46","metadata_sha256":"e697f3e93383b9df8170941133fb062d862c94407ecf25ac129e38fee36babde","url":"https://www.usgs.gov/3d-elevation-program/about-3dep-products-services","rights":"Copied website attribution identifies underlying USGS 3DEP data as public domain. Only encoded heights are decoded; no NAIP imagery, OSM place positions or photographs enter this pack.","source_spacing_m":[4,201.0249536694555],"derived_grid_spacing_m":60,"horizontal_crs":"EPSG:26912","vertical_datum":"NAVD88 metres","acquisition_date":"Not independently re-established in this lane; use inherited source records.","use":"60 m grid, 120 m-sampled contours at 100 m intervals, four terrain profiles and original relief shading. Original DEM resolution does not survive throughout the variable-resolution display mesh."},
    {"id":"nps-divide","title":"NPS Protect the Hoodoos","url":"https://www.nps.gov/brca/learn/nature/protect-the-hoodoos.htm","source_updated":"2018-10-16","rights":"Factual reading only; no images copied.","use":"Context for East Fork Sevier drainage west of the Bryce Amphitheater and constructed transfer through Water Canyon. No erosion rates or future dates reproduced."},
    {"id":"nps-monitoring","title":"NPS Trends in Water Quality at Bryce Canyon National Park, Water Years 2006–2021","url":"https://www.nps.gov/articles/000/ncpn_brca_water-quality-trends_2021.htm","source_updated":"2022-11-08","rights":"Factual reading only; no maps, photographs, measurements or site coordinates copied.","use":"Independent documentation that Sheep and Yellow creeks are named study streams. No current water quality or availability claim."}
  ],
  "evidence_classes": {
    "maps_and_sections":"derived",
    "regular_terrain_grid":"derived",
    "reference_hydrography":"reference data generalized for display",
    "slope_trace":"derived teaching route; not measured flow or surveyed channel",
    "relief_light_and_palette":"illustrative rendering of derived terrain"
  },
  "media_rights": [
    {"files":["bryce-map.svg","bryce-section.svg"],"source_ids":["wbd-140700070102","wbd-context","nhd-local","existing-terrain"],"rights":"Original BCC vectors derived from credited public-domain USGS data; no third-party media."},
    {"files":["tropic-map.svg","tropic-section.svg"],"source_ids":["wbd-160300020302","wbd-context","nhd-local","existing-terrain"],"rights":"Original BCC vectors derived from credited public-domain USGS data; no third-party media."},
    {"files":["yellow-map.svg","yellow-section.svg"],"source_ids":["wbd-140700070107","wbd-context","nhd-local","existing-terrain"],"rights":"Original BCC vectors derived from credited public-domain USGS data; no third-party media."},
    {"files":["sheep-map.svg","sheep-section.svg"],"source_ids":["wbd-140700070201","wbd-context","nhd-local","existing-terrain"],"rights":"Original BCC vectors derived from credited public-domain USGS data; no third-party media."},
    {"files":["terrain-relief.webp"],"source_ids":["existing-terrain"],"rights":"Original BCC fixed-light scientific rendering of the USGS-derived grid; not a photograph or an AI image."}
  ]
}