{ "id": "boat-mesa", "name": "Boat Mesa", "center": [ -112.14557747648571, 37.641989522747 ], "width_m": 1024, "priority": 1, "source_ids": [ "gnis-north", "nps-fairyland" ], "question": "How does a broad cap give way to an edge of fins?", "theme": "A summit with a protective cap", "view_yaw": 1.05, "view_pitch": 0.7, "locator": { "source_id": "gnis-north", "feature_id": 1438979, "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": 2210, "center_utm": [ 398932.6417894899, 4166711.3333039884 ], "bounds_utm": [ 398420.6417894899, 4166199.3333039884, 399444.6417894899, 4167223.3333039884 ], "bounds_wgs84": [ -112.15145104636265, 37.63731907811533, -112.1397046240529, 37.6466596970009 ], "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": 37786985, "density_returns_per_m2": 36.036, "ground_returns": 9184442, "retained_returns": 9184442, "vegetation_candidate_returns": 13326310, "excluded_noise_or_other": 15872, "directly_observed_node_fraction": 0.9541093365859961, "interpolated_node_fraction": 0.036683651949887715, "unsupported_node_fraction": 0.009207011464116214, "isolated_high_cells_repaired": 9, "maximum_nearest_fill_m": 3.0, "cell_m": 2.0, "source_heights_m": [ 2222.010009765625, 2467.8798828125 ], "surface_heights_m": [ 2222.52001953125, 2463.489990234375 ], "intensity_display_percentiles": [ 1904.0, 12128.0 ], "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": 0.009207011464116214 }, "levels": [ { "file": "small.glb.gz", "bytes": 428610, "uncompressed_bytes": 1110492, "sha256": "c3aa19a10a8bf7bde6c179d4db5b54396b12465b7f3ce2b2acfa5769c619c674", "id": "small", "vertices": 16641, "triangles": 31368, "grid_nodes": 129, "spacing_m": 8.0, "degenerate_triangles": 0, "downward_triangles": 0 }, { "file": "balanced.glb.gz", "bytes": 1644766, "uncompressed_bytes": 4443124, "sha256": "2081a0a6bc2d0ed9d572762f39f75ec2b3f141c759d804d5107b70e211e7930c", "id": "balanced", "vertices": 66049, "triangles": 127924, "grid_nodes": 257, "spacing_m": 4.0, "degenerate_triangles": 0, "downward_triangles": 0 }, { "file": "detailed.glb.gz", "bytes": 6488272, "uncompressed_bytes": 17772208, "sha256": "cd20d1a1b41c92407d5d484bf40259447c444a5c78b9f9863a1167205601b913", "id": "detailed", "vertices": 263169, "triangles": 515906, "grid_nodes": 513, "spacing_m": 2.0, "degenerate_triangles": 0, "downward_triangles": 0 } ], "returns": { "file": "returns.glb.gz", "bytes": 1257816, "uncompressed_bytes": 2881224, "sha256": "1cba65c102890e1e197aa6ddf6fef14620db63578359afc12b6c2538584ebddf", "count": 120000, "sampling": "fixed seed 20261002, uniform without replacement from valid crop returns" }, "profiles": "profiles.json.gz", "camera": { "yaw": 1.05, "pitch": 0.7, "distance_m": 2195.9778667439246, "target": [ 0, 115.9459457397461, 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": [ [ -512.0, 12.52001953125, -512.0 ], [ 512.0, 253.489990234375, 512.0 ] ], "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": "8538862f17447795c8d8e6fee33012909009fe5f9fea63c8ebdc853308cd7b90", "source_object_count": 1045 }, "editorial": { "lede": "A broad summit holds above a landscape cut into fins and hollows.", "body": "Boat Mesa sits south of Fairyland Point. NPS describes a resistant conglomerate cap above the Claron rocks that form the surrounding hoodoos. Turn this new summit-centered crop to follow the contrast between the broad upper surface and its dissected margins.", "lesson": "Move a west-to-east section across the mesa. A relatively gentle upper surface gives way to steeper margins, but the profile measures topography, not cap thickness. This study uses only the survey’s ground class to remove the forest canopy; compare the full return sample to see the difference.", "limit": "The source ground class can omit standing rock; hidden cliff faces remain unresolved. Published geology identifies the conglomerate, but this surface does not map its contact or measure cap thickness.", "caption": "Boat Mesa and its dissected margins, reconstructed from airborne returns. Warm material and illumination are illustrative.", "evidence_title": "Read the break in the skyline", "evidence_note": "The profile shows surface shape at equal horizontal and vertical scale. It cannot show a buried contact or date erosion.", "annotation_title": "Boat Mesa summit locator", "annotation_text": "The USGS named-summit point locates the subject. Its height here is sampled from the derived surface; the point does not define the extent of the mesa." }, "imagery": { "publisher": "USDA Farm Service Agency / FPAC", "dataset": "National Agriculture Imagery Program (NAIP), Utah 2024", "retrieved_at": "2026-10-02T09:19:30.306009+00:00", "source_pixels_m": 0.6, "export_pixels": 1707, "export_pixel_m": 0.5998828353837141, "crs": "EPSG:32612", "requested_bounds": [ 398420.6417894899, 4166199.3333039884, 399444.6417894899, 4167223.3333039884 ], "export_extent": { "xmin": 398420.6417894899, "ymin": 4166199.3333039884, "xmax": 399444.6417894899, "ymax": 4167223.3333039884, "spatialReference": { "wkid": 32612, "latestWkid": 32612 } }, "flight_dates": [ "2024-07-23" ], "images": [ { "OBJECTID": 195984, "Name": "m_3711223_se_12_060_20240723", "Category": 1, "year_ts": 2024, "ST": "UT", "QQNAME": "3711223SE060", "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%3A398420.6417894899%2C%22ymin%22%3A4166199.3333039884%2C%22xmax%22%3A399444.6417894899%2C%22ymax%22%3A4167223.3333039884%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=398420.6417894899%2C4166199.3333039884%2C399444.6417894899%2C4167223.3333039884&bboxSR=32612&imageSR=32612&size=1707%2C1707&format=png&pixelType=U8&interpolation=RSP_BilinearInterpolation&adjustAspectRatio=false&bandIds=0%2C1%2C2&mosaicRule=%7B%22mosaicMethod%22%3A%22esriMosaicLockRaster%22%2C%22lockRasterIds%22%3A%5B195984%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=398420.6417894899%2C4166199.3333039884%2C399444.6417894899%2C4167223.3333039884&bboxSR=32612&imageSR=32612&size=1707%2C1707&format=png&pixelType=U8&interpolation=RSP_BilinearInterpolation&adjustAspectRatio=false&bandIds=0%2C1%2C2&mosaicRule=%7B%22mosaicMethod%22%3A%22esriMosaicLockRaster%22%2C%22lockRasterIds%22%3A%5B195984%5D%2C%22mosaicOperation%22%3A%22MT_FIRST%22%7D", "original_sha256": "183c6ca1ef4855a61f504dcc619f341e4ff2e5c158cb8a71c7e2dc068fb2bed0", "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": "Boat Mesa summit locator", "text": "The USGS named-summit point locates the subject. Its height here is sampled from the derived surface; the point does not define the extent of the mesa.", "position": [ 0.0, 255.60009765625, 0.0 ], "anchor_surface_elevation_navd88_m": 2460.60009765625, "display_lift_m": 5, "coordinate_source": { "source_id": "gnis-north", "feature_id": 1438979, "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": 2291.03, "maximum_m": 2460.8, "vertical_exaggeration": 1, "source": "profiles.json.gz" }, "source_coordinate_check": "source-coordinate-check.json", "textures": [ { "file": "aerial.webp", "bytes": 1141992, "sha256": "7d47277862e1f71c2997334135f17785f7844dc8784fd3e91c26e7996cc23529", "role": "separate overhead evidence image, never wall texture" }, { "file": "aerial-small.webp", "bytes": 131498, "sha256": "4fef714d5be02a23a05e4089ec9f01dc26440221c7d9c83dfdb9d6ae67c27fab", "role": "separate overhead evidence image, never wall texture" } ], "quality_record": "quality.json" }