{ "id": "hat-shop", "name": "Hat Shop slopes", "group": "Below the main rim", "center": [ -112.1441, 37.5916 ], "width_m": 480, "surface_method": "classified-ground", "source_ids": [ "nps-hat-shop", "nps-pois", "gnis" ], "place_ids": [ "hat-shop" ], "theme": "A slope beneath the standing forms", "question": "What disappears when the survey selects the ground?", "interaction": "returns", "view_yaw": 1.0, "view_pitch": 1.12, "schema": 1, "kind": "landscape-study", "checked_at": "2026-10-02", "geometry_status": "Derived from source-classified ground returns; terrain study, not a closed rock scan", "coordinate_system": { "native_horizontal": "NAD83(2011) / UTM 12N (EPSG:6341)", "ept_horizontal": "WGS84 Pseudo-Mercator (EPSG:3857)", "export_horizontal": "WGS84 / UTM 12N (EPSG:32612)", "vertical": "NAVD88, Geoid12B; source heights retained", "units": "metres", "axes": "x east, y up from base_m, z south", "base_m": 2120, "center_utm": [ 398994.8447595352, 4161118.9977833745 ], "bounds_utm": [ 398754.8447595352, 4160878.9977833745, 399234.8447595352, 4161358.9977833745 ], "bounds_wgs84": [ -112.14685120988555, 37.589410807083816, -112.1413489473641, 37.59378913361264 ], "vertical_exaggeration": 1, "transform_note": "EPT projection transformed with pyproj; no claim of survey-grade datum alignment. Centimetre export quantization is not source accuracy." }, "statistics": { "returns_in_crop": 7889705, "density_returns_per_m2": 34.244, "ground_returns": 2054209, "retained_returns": 2054209, "vegetation_candidate_returns": 3359541, "excluded_noise_or_other": 3102, "directly_observed_node_fraction": 0.9501347043154779, "interpolated_node_fraction": 0.04926872085997971, "unsupported_node_fraction": 0.0005965748245424043, "isolated_high_cells_repaired": 0, "source_gap_node_fraction": 0.00012539470834330792, "cliff_or_small_patch_omission_fraction": 0.0004711801161990964, "maximum_3x3_relief_m": 12.0, "minimum_connected_patch_m2": 100.0, "maximum_nearest_fill_m": 3.0, "cell_m": 0.9375, "distance_reference": "Distance between grid-node centers, not exact source-point XY.", "maximum_grid_bin_offset_m": 0.6629126073623882, "maximum_source_xy_distance_bound_m": 3.6629126073623883, "source_heights_m": [ 2137.320068359375, 2278.10009765625 ], "surface_heights_m": [ 2137.449951171875, 2276.199951171875 ], "intensity_display_percentiles": [ 1456.0, 12304.0 ], "vertical_surfaces": "Abrupt interpolated cliff nodes are omitted; directly sampled bins are retained. Connecting top-surface samples still does not measure a wall, undercut, window or unseen interior.", "surface_method": "classified-ground" }, "levels": [ { "file": "small.glb.gz", "bytes": 427146, "uncompressed_bytes": 1126056, "sha256": "83684412713f9e24c00b54cd90cc0c842d8ac88b647e14cbf7932145a807807b", "id": "small", "vertices": 16641, "triangles": 32664, "grid_nodes": 129, "spacing_m": 3.75, "degenerate_triangles": 0, "downward_triangles": 0 }, { "file": "balanced.glb.gz", "bytes": 1632164, "uncompressed_bytes": 4477972, "sha256": "d6da649d8cbb31d59e813b3f9ef6be03d1426ac933c727c32aff9b3aaabada9d", "id": "balanced", "vertices": 66049, "triangles": 130828, "grid_nodes": 257, "spacing_m": 1.875, "degenerate_triangles": 0, "downward_triangles": 0 }, { "file": "detailed.glb.gz", "bytes": 6370064, "uncompressed_bytes": 17865640, "sha256": "ba07467419e71353b584a3907793fa6a8d40b6888ac93987983c79c4363e751a", "id": "detailed", "vertices": 263169, "triangles": 523692, "grid_nodes": 513, "spacing_m": 0.9375, "degenerate_triangles": 0, "downward_triangles": 0 } ], "returns": { "file": "returns.glb.gz", "bytes": 1230937, "uncompressed_bytes": 2881232, "sha256": "e100853e4d832fb32cbf681e6bc4e46c34af5db05b792fdfdc730c263d9fb060", "count": 120000, "sampling": "fixed seed 20261002, uniform without replacement from valid crop returns" }, "profiles": "profiles.json.gz", "coverage": { "image": "coverage.webp", "data": "coverage.json.gz", "nodes": 513, "orientation": "north up; west left" }, "camera": { "yaw": 1.0, "pitch": 1.12, "distance_m": 960.0, "target": [ 0, 101.97998046875, 0 ], "limits": { "minimum_distance_widths": 1.35, "maximum_distance_widths": 4, "minimum_pitch_radians": 1.0, "maximum_pitch_radians": 1.55 }, "scope": "Above-terrain observation only; no ground-level camera or visitor-viewpoint equivalence." }, "bounds_local": [ [ -240.0, 17.449951171875, -240.0 ], [ 240.0, 156.199951171875, 240.0 ] ], "source_dataset": { "id": "USGS_LPC_UT_Southern_QL1_2018_LAS_2019", "acquired": "2018-04-27 / 2018-07-29 project interval", "published": "2019-06-03", "url": "https://registry.opendata.aws/usgs-lidar/", "license": "US Government Public Domain", "credit": "Map services and data available from U.S. Geological Survey, National Geospatial Program." }, "processing": { "mesh": "Source class 2 ground only. Highest retained return per nearest grid node; nearest interpolation up to 3 m; isolated spikes exceeding all 8 neighbors by 6 m lowered to neighbor maximum. Interpolated nodes with more than 12 m relief across a 3x3 neighborhood and connected patches smaller than 100 m² are omitted. Directly sampled ground bins otherwise remain, including steep rims. Original returns are unchanged. No morphological closing.", "vegetation": "Source classes 3/4/5 plus low-intensity multiple echoes and low-intensity raised returns over nearby gentle classified ground are excluded. This is an imperfect heuristic, not a species/rock classifier.", "lighting": "Normals and static 12-direction terrain occlusion are derived; material color, studio lighting and display category colors are illustrative.", "detail": "Three nested node grids; no-data cells omitted at every LOD; low LOD can omit extra edge triangles to preserve holes." }, "limitations": [ "Hidden rock surfaces, undercuts and windows are not reconstructed.", "Abrupt interpolated cliff nodes are omitted; connections between directly sampled bins are derived facets, not measured wall surfaces.", "Ground classification can omit standing rock or retain classification errors; inspect the return view.", "NAIP is overhead imagery from a different year; it cannot supply photographic detail on vertical faces.", "The cut boundary is an editorial crop; there is no modeled geology beneath it.", "No route, current condition, erosion rate or collapse forecast is inferred." ], "posters": { "large": "poster.webp", "small": "poster-small.webp", "material": "aerial", "geometry_year": 2018, "imagery_year": 2024, "kind": "actual model render, not a ground photograph" }, "quality_status": "qualified-ground-terrain-with-visible-omissions", "editorial": { "lede": "The hats are small. The slope that carries them is a much larger story.", "body": "Below Bryce Point, the Hat Shop is a cluster of narrow pinnacles with large boulder caps. This study places the group within its surrounding slope. Compare the ground surface with the original laser returns: the survey’s ground classification can omit both vegetation and standing formations.", "lesson": "The selected ground returns describe the hillside. Other source returns may sample a cap or a tree crown; the point cloud alone does not label them as rock. A single-height surface cannot represent a cap and the narrower column beneath it at the same horizontal position.", "limit": "A ground-surface study around Hat Shop, not a complete model of the balanced rocks. Ground classification can omit the pillars; cap undersides, narrow necks and hidden faces remain unresolved.", "caption": "Source-classified ground around Hat Shop. Standing formations can be omitted, and cap undersides are unresolved.", "comparison": "The NPS Hat Shop viewpoint and the GNIS pillar locator are separate mapped points about 137 m apart. Both lie within this crop; neither defines the exact boundary of the group." }, "sources": [ { "id": "nps-hat-shop", "title": "Hat Shop", "url": "https://www.nps.gov/thingstodo/hat-shop.htm", "publisher": "National Park Service", "date": "2024-10-10", "retrieved_at": "2026-10-02", "license": "Facts paraphrased and linked. Photograph rights recorded separately per image.", "supports": "Balanced-rock hoodoo identity and relationship to Bryce Point; no operational trail metrics reused." }, { "id": "nps-pois", "title": "NPS Public Points of Interest", "url": "https://mapservices.nps.gov/arcgis/rest/services/NationalDatasets/NPS_Public_POIs/FeatureServer/0", "publisher": "National Park Service", "date": "dataset records have individual dates", "retrieved_at": "2026-10-02", "license": "NPS public geospatial data; no endorsement; agency source and accuracy fields preserved", "supports": "Mapped overlook positions; Hat Shop Hoodoos Viewpoint 9513. Accuracy is unknown, scaled or >=14 m for used records. Existing travel coordinates remain unchanged; similar names with different roles are not substituted." }, { "id": "gnis", "title": "Geographic Names — Landforms", "url": "https://carto.nationalmap.gov/arcgis/rest/services/geonames/MapServer/5", "publisher": "US Geological Survey", "date": null, "retrieved_at": "2026-10-02", "license": "US Government Public Domain; USGS National Map terms", "supports": "Independent named-feature locators, including Hat Shop 1441625, Farview 1441016, Piracy 1444459 and Corral Hollow 1439972. Points do not define a feature boundary. Valley records include multiple positions, not a trail polyline." } ], "imagery": { "publisher": "USDA Farm Service Agency / FPAC", "dataset": "National Agriculture Imagery Program (NAIP), Utah 2024", "retrieved_at": "2026-10-02T09:10:21.222898+00:00", "source_pixels_m": 0.6, "export_pixels": 800, "export_pixel_m": 0.6, "crs": "EPSG:32612", "requested_bounds": [ 398754.8447595352, 4160878.9977833745, 399234.8447595352, 4161358.9977833745 ], "export_extent": { "xmin": 398754.8447595352, "ymin": 4160878.9977833745, "xmax": 399234.8447595352, "ymax": 4161358.9977833745, "spatialReference": { "wkid": 32612, "latestWkid": 32612 } }, "flight_dates": [ "2024-07-23" ], "images": [ { "OBJECTID": 195950, "Name": "m_3711231_ne_12_060_20240723", "Category": 1, "year_ts": 2024, "ST": "UT", "QQNAME": "3711231NE060", "QQDATE": 1721692800000, "iDate_ts": 1749744257170 } ], "catalog_url": "https://apps.geo.fpac.usda.gov/geo-imagery/rest/services/naip/conus_naip/ImageServer/query?f=json&geometry=%7B%22xmin%22%3A398754.8447595352%2C%22ymin%22%3A4160878.9977833745%2C%22xmax%22%3A399234.8447595352%2C%22ymax%22%3A4161358.9977833745%2C%22spatialReference%22%3A%7B%22wkid%22%3A32612%7D%7D&geometryType=esriGeometryEnvelope&inSR=32612&spatialRel=esriSpatialRelIntersects&outFields=%2A&returnGeometry=false&where=Category%3D1+AND+year_ts%3D2024", "export_url": "https://apps.geo.fpac.usda.gov/geo-imagery/rest/services/naip/conus_naip/ImageServer/exportImage?f=json&bbox=398754.8447595352%2C4160878.9977833745%2C399234.8447595352%2C4161358.9977833745&bboxSR=32612&imageSR=32612&size=800%2C800&format=png&pixelType=U8&interpolation=RSP_BilinearInterpolation&adjustAspectRatio=false&bandIds=0%2C1%2C2&mosaicRule=%7B%22mosaicMethod%22%3A%22esriMosaicLockRaster%22%2C%22lockRasterIds%22%3A%5B195950%5D%2C%22mosaicOperation%22%3A%22MT_FIRST%22%7D", "direct_image_url": "https://apps.geo.fpac.usda.gov/geo-imagery/rest/services/naip/conus_naip/ImageServer/exportImage?f=image&bbox=398754.8447595352%2C4160878.9977833745%2C399234.8447595352%2C4161358.9977833745&bboxSR=32612&imageSR=32612&size=800%2C800&format=png&pixelType=U8&interpolation=RSP_BilinearInterpolation&adjustAspectRatio=false&bandIds=0%2C1%2C2&mosaicRule=%7B%22mosaicMethod%22%3A%22esriMosaicLockRaster%22%2C%22lockRasterIds%22%3A%5B195950%5D%2C%22mosaicOperation%22%3A%22MT_FIRST%22%7D", "original_sha256": "851de63eeb8f40cac5b9a6a88243b03d8476615ef875057d588b1c7f0b963a5b", "license": "US Government Public Domain", "license_url": "https://catalog.data.gov/dataset/national-agriculture-imagery-program-naip-imagery", "processing": "Locked 2024 primary rasters, RGB bands 0/1/2, orthographic drape; bilinear export, WebP encoding. No invented detail.", "limitations": "Leaf-on aerial imagery draped on 2018 filtered topography; acquisition shadows, tree crowns, temporal differences and metre-scale registration error remain. Cliff faces stretch a top-down pixel; hidden walls are not photographed." }, "visual_review": { "checked_at": "2026-10-02", "views": [ "overview", "left oblique", "right oblique", "nearest allowed", "aerial", "north-up" ], "scope": "Above-terrain ground study only. Visible gaps remain; neither closed cliffs nor cap/neck fidelity is accepted.", "camera_minimum_pitch_degrees": 57.2957795, "camera_minimum_distance_widths": 1.35 } }