{ "id": "sinking-ship", "name": "Sinking Ship", "center": [ -112.1166757533726, 37.64021444009447 ], "width_m": 768, "priority": 1, "source_ids": [ "gnis-north", "nps-fairyland" ], "question": "What can a tilted skyline tell us—and what can a terrain surface not measure?", "theme": "A tilted skyline", "view_yaw": -1.15, "view_pitch": 0.64, "locator": { "source_id": "gnis-north", "feature_id": 1445620, "role": "summit name locator" }, "surface_method": "classified-ground", "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": 2100, "center_utm": [ 401480.205101382, 4166483.6386814294 ], "bounds_utm": [ 401096.205101382, 4166099.6386814294, 401864.205101382, 4166867.6386814294 ], "bounds_wgs84": [ -112.12107945945165, 37.63671266394413, -112.11227245083656, 37.64371606390076 ], "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": 18433800, "density_returns_per_m2": 31.253, "ground_returns": 5458298, "retained_returns": 5458298, "vegetation_candidate_returns": 5225165, "excluded_noise_or_other": 8589, "directly_observed_node_fraction": 0.9692288985404816, "interpolated_node_fraction": 0.025287932849233762, "unsupported_node_fraction": 0.005483168610284646, "isolated_high_cells_repaired": 0, "maximum_nearest_fill_m": 3.0, "cell_m": 1.5, "source_heights_m": [ 2109.909912109375, 2345.8798828125 ], "surface_heights_m": [ 2110.080078125, 2344.719970703125 ], "intensity_display_percentiles": [ 2320.0, 15056.0 ], "vertical_surfaces": "An upper envelope can join returns across a steep face; it cannot recover undercuts, windows, or unseen interiors.", "surface_method": "classified-ground", "editorial_exclusion_node_fraction": 0.0, "unsupported_or_excluded_node_fraction": 0.005483168610284646 }, "levels": [ { "file": "small.glb.gz", "bytes": 428348, "uncompressed_bytes": 1120584, "sha256": "3bab0410be4597c60fa7f1d487d823dd1ebe2dcd6e43701b058c967b8d6ebf0f", "id": "small", "vertices": 16641, "triangles": 32208, "grid_nodes": 129, "spacing_m": 6.0, "degenerate_triangles": 0, "downward_triangles": 0 }, { "file": "balanced.glb.gz", "bytes": 1646129, "uncompressed_bytes": 4463548, "sha256": "206c2b1ae42bd203bf96606739d79a5d228f508d4aad32d64250d478c98244c4", "id": "balanced", "vertices": 66049, "triangles": 129626, "grid_nodes": 257, "spacing_m": 3.0, "degenerate_triangles": 0, "downward_triangles": 0 }, { "file": "detailed.glb.gz", "bytes": 6479614, "uncompressed_bytes": 17820636, "sha256": "bb723c6f5388f69bdeac49792ab204d1ba6be0cf55ec762b5d10fe1c9ae61b81", "id": "detailed", "vertices": 263169, "triangles": 519942, "grid_nodes": 513, "spacing_m": 1.5, "degenerate_triangles": 0, "downward_triangles": 0 } ], "returns": { "file": "returns.glb.gz", "bytes": 1248181, "uncompressed_bytes": 2881228, "sha256": "8bdb324bc45c44e7d6761d89842ad33d65b7d429508200e9865b194fe5314a48", "count": 120000, "sampling": "fixed seed 20261002, uniform without replacement from valid crop returns" }, "profiles": "profiles.json.gz", "camera": { "yaw": -1.15, "pitch": 0.64, "distance_m": 1654.6909670595332, "target": [ 0, 125.389892578125, 0 ], "minimum_distance_ratio": 0.85, "useful_range_note": "Landscape inspection only; camera is not permitted to approach a ground-walk distance.", "reference_viewport": [ 1400, 1050 ], "vertical_fov_degrees": 38, "fit_method": "Runtime projects actual active vertices to fit the viewport with a 14 percent frame margin; distance_m records the poster reference view.", "closest_reviewed_distance_ratio": 0.85 }, "bounds_local": [ [ -384.0, 10.080078125, -384.0 ], [ 384.0, 244.719970703125, 384.0 ] ], "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. 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.", "exclusions": "Elliptical uncertainty masks remove the entire plan footprint around unresolved arch/alcove geometry; all LODs conservatively preserve these holes. They are not measured opening outlines." }, "limitations": [ "Hidden rock surfaces, undercuts and windows are not reconstructed.", "A vertical face is an interpolated connection between top-surface samples, not a wall scan.", "Vegetation filtering can leave crowns or remove dark rock; 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" }, "quality_status": "accepted_local_educational_landscape", "exclusions": [], "source_acquisition": { "path": "acquisition.json", "points_sha256": "5ff88e9b5b7dd864665062053f734d1d1e3aea3ddefb85e5bd069457e73aa229", "source_object_count": 572 }, "editorial": { "lede": "A slanting skyline stands apart from the larger plateau edge.", "body": "NPS relates Sinking Ship’s tilted appearance to faulting along the eastern edge of the park. This separate crop isolates the formation and the slopes around it. Its shape can be compared with Boat Mesa without mistaking the two features for different views of the same model.", "lesson": "Rotate to the other side, then inspect a section. This study follows the survey’s ground class to avoid treating forest canopy as rock. A ground slope is not automatically the dip of a rock bed, the angle of a fault, or the amount of displacement.", "limit": "The ground class can omit standing rock. No fault plane, bed orientation or contact is inferred from this terrain. Published fault interpretation and measured modern topography are different evidence.", "caption": "The Sinking Ship crop in oblique relief, with the surrounding slopes at true vertical scale.", "evidence_title": "A slope is not a rock-bed angle", "evidence_note": "Compare the surface profile with the NPS interpretation. The model has no measured bedding orientations.", "annotation_title": "Sinking Ship summit locator", "annotation_text": "USGS places the named summit here. The label is anchored to this published location and the sampled upper surface, not to an invented fault plane." }, "imagery": { "publisher": "USDA Farm Service Agency / FPAC", "dataset": "National Agriculture Imagery Program (NAIP), Utah 2024", "retrieved_at": "2026-10-02T09:24:06.110163+00:00", "source_pixels_m": 0.6, "export_pixels": 1280, "export_pixel_m": 0.6, "crs": "EPSG:32612", "requested_bounds": [ 401096.205101382, 4166099.6386814294, 401864.205101382, 4166867.6386814294 ], "export_extent": { "xmin": 401096.205101382, "ymin": 4166099.6386814294, "xmax": 401864.205101382, "ymax": 4166867.6386814294, "spatialReference": { "wkid": 32612, "latestWkid": 32612 } }, "flight_dates": [ "2024-07-24" ], "images": [ { "OBJECTID": 195981, "Name": "m_3711224_sw_12_060_20240724", "Category": 1, "year_ts": 2024, "ST": "UT", "QQNAME": "3711224SW060", "QQDATE": 1721779200000, "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%3A401096.205101382%2C%22ymin%22%3A4166099.6386814294%2C%22xmax%22%3A401864.205101382%2C%22ymax%22%3A4166867.6386814294%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=401096.205101382%2C4166099.6386814294%2C401864.205101382%2C4166867.6386814294&bboxSR=32612&imageSR=32612&size=1280%2C1280&format=png&pixelType=U8&interpolation=RSP_BilinearInterpolation&adjustAspectRatio=false&bandIds=0%2C1%2C2&mosaicRule=%7B%22mosaicMethod%22%3A%22esriMosaicLockRaster%22%2C%22lockRasterIds%22%3A%5B195981%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=401096.205101382%2C4166099.6386814294%2C401864.205101382%2C4166867.6386814294&bboxSR=32612&imageSR=32612&size=1280%2C1280&format=png&pixelType=U8&interpolation=RSP_BilinearInterpolation&adjustAspectRatio=false&bandIds=0%2C1%2C2&mosaicRule=%7B%22mosaicMethod%22%3A%22esriMosaicLockRaster%22%2C%22lockRasterIds%22%3A%5B195981%5D%2C%22mosaicOperation%22%3A%22MT_FIRST%22%7D", "original_sha256": "ee2d85febb44bee583b7ca909c42bd9a0c51552fb04ea64688c09ab749fe3514", "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 from a different year than the 2018 topography; acquisition shadows, tree crowns and metre-scale registration error remain. Displayed only in the overhead evidence view, never as a wall photograph." }, "sources": [ { "id": "gnis-north", "title": "USGS geographic names: northern Bryce landforms", "publisher": "US Geological Survey / National Geospatial Program", "url": "https://carto.nationalmap.gov/arcgis/rest/services/geonames/MapServer/5", "date": null, "rights": "US Government Public Domain", "supports": "Official names and published locators for Boat Mesa, Sinking Ship, Chinese Wall, Bristlecone Point and audited alternatives. Name points are not surveyed feature boundaries.", "evidence": "gnis-north-landforms.json" }, { "id": "nps-fairyland", "title": "Fairyland Point", "publisher": "National Park Service", "url": "https://www.nps.gov/places/000/fairyland-point.htm", "date": "2024-10-10", "rights": "Paraphrased government text; page photographs not copied", "supports": "Boat Mesa conglomerate cap, Sinking Ship fault interpretation, Fairyland and Campbell Canyon context. No numeric erosion age/rate derived here.", "evidence": "nps-fairyland.html" } ], "annotations": [ { "title": "Sinking Ship summit locator", "text": "USGS places the named summit here. The label is anchored to this published location and the sampled upper surface, not to an invented fault plane.", "position": [ 0.0, 238.780029296875, 0.0 ], "anchor_surface_elevation_navd88_m": 2333.780029296875, "display_lift_m": 5, "coordinate_source": { "source_id": "gnis-north", "feature_id": 1445620, "role": "summit name locator" }, "height_method": "Nearest fine-grid sample at published locator; display lift is illustrative; no surveyed feature elevation asserted" } ], "static_profile": { "row": 64, "direction": "west to east", "north_offset_m": 0, "minimum_m": 2166.88, "maximum_m": 2334.65, "vertical_exaggeration": 1, "source": "profiles.json.gz" }, "source_coordinate_check": "source-coordinate-check.json", "textures": [ { "file": "aerial.webp", "bytes": 443468, "sha256": "d9dcfdff7f06d36d42b3061d4925af103afb4e56e0e199109e17d314f1b2fc43", "role": "separate overhead evidence image, never wall texture" }, { "file": "aerial-small.webp", "bytes": 89872, "sha256": "11fbf33db11b0e7108982469f4d2b63925f354f6eb7e662d43e0bc0a41dd15a6", "role": "separate overhead evidence image, never wall texture" } ], "quality_record": "quality.json" }